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Boardwalk Pipeline Partners, LP – ‘10-K’ for 12/31/18 – ‘EX-101.LAB’

On:  Wednesday, 2/13/19, at 8:08am ET   ·   For:  12/31/18   ·   Accession #:  1336047-19-6   ·   File #:  1-32665

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  As Of               Filer                 Filing    For·On·As Docs:Size

 2/13/19  Boardwalk Pipeline Partners, LP   10-K       12/31/18  103:17M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        10-K Bwp 2018                                       HTML   2.13M 
 2: EX-3.2      Bwp 18 Q4 Exhibit 3.2                               HTML     95K 
 3: EX-23.1     Bwp 18 Q4 Exhibit 23.1                              HTML     28K 
 4: EX-31.1     Bwp 18 Q4 Exhibit 31.1                              HTML     34K 
 5: EX-31.2     Bwp 18 Q4 Exhibit 31.2                              HTML     35K 
 6: EX-32.1     Bwp 18 Q4 Exhibit 32.1                              HTML     28K 
 7: EX-32.2     Bwp 18 Q4 Exhibit 32.2                              HTML     28K 
14: R1          Document And Entity Information                     HTML     61K 
15: R2          Consolidated Balance Sheets                         HTML    157K 
16: R3          Consolidated Balance Sheets (Parenthetical)         HTML     30K 
17: R4          Consolidated Statements of Income                   HTML     81K 
18: R5          Consolidated Statements of Comprehensive Income     HTML     46K 
19: R6          Consolidated Statements of Cash Flows               HTML    109K 
20: R7          Consolidated Statements of Changes in Partners'     HTML     52K 
                Capital                                                          
21: R8          Corporate Structure                                 HTML     33K 
22: R9          Basis of Presentations and Accounting Policies      HTML    138K 
23: R10         Revenues                                            HTML     68K 
24: R11         Commitments and Contingencies                       HTML     56K 
25: R12         Other Comprehensive Income and Fair Value           HTML     77K 
                Measurements                                                     
26: R13         Property, Plant and Equipment                       HTML     99K 
27: R14         Goodwill and Intangible Assets                      HTML     47K 
28: R15         Asset Retirement Obligations                        HTML     44K 
29: R16         Regulatory Assets and Liabilities                   HTML     50K 
30: R17         Financing                                           HTML    113K 
31: R18         Employee Benefits                                   HTML    359K 
32: R19         Income Taxes                                        HTML     49K 
33: R20         Credit Risk                                         HTML     34K 
34: R21         Related Party Transactions                          HTML     33K 
35: R22         Supplemental Disclosure of Cash Flow Information    HTML     41K 
36: R23         Selected Quarterly Financial Data (Unaudited)       HTML     88K 
37: R24         Guarantee of Securities of Subsidiaries             HTML    786K 
38: R25         Accounting Policies (Policies)                      HTML    207K 
39: R26         Accounting Policies (Tables)                        HTML     74K 
40: R27         Revenues (Tables)                                   HTML     66K 
41: R28         Commitments and Contingencies (Tables)              HTML     43K 
42: R29         Other Comprehensive Income and Fair Value           HTML     69K 
                Measurements Fair Value Measurements (Tables)                    
43: R30         Property, Plant and Equipment (Tables)              HTML     95K 
44: R31         Goodwill and Intangible Assets (Tables)             HTML     45K 
45: R32         Asset Retirement Obligations (Tables)               HTML     41K 
46: R33         Regulatory Assets and Liabilities (Tables)          HTML     53K 
47: R34         Financing (Tables)                                  HTML     96K 
48: R35         Employee Benefits (Tables)                          HTML    342K 
49: R36         Income Taxes (Tables)                               HTML     46K 
50: R37         Supplemental Disclosure of Cash Flow Information    HTML     40K 
                (Tables)                                                         
51: R38         Selected Quarterly Financial Data (Unaudited)       HTML     88K 
                (Tables)                                                         
52: R39         Guarantee of Securities of Subsidiaries (Tables)    HTML    783K 
53: R40         Corporate Structure (Details)                       HTML     33K 
54: R41         Basis of Presentation and Accounting Policies       HTML     43K 
                Basis of Presentation (Details)                                  
55: R42         Basis of Presentation and Accounting Policies       HTML     45K 
                Revenue, Initial Application (Details)                           
56: R43         Basis of Presentation and Accounting Policies New   HTML     96K 
                Accounting Pronouncements (Details)                              
57: R44         Accounting Policies (Details)                       HTML     46K 
58: R45         Basis of Presentation and Accounting Policies       HTML     35K 
                Property, Plant and Equipment (PPE) and Repair and               
                Maintenance Costs (Details)                                      
59: R46         Revenues Disaggregation of Revenue (Details)        HTML     53K 
60: R47         Revenues Contract Balances (Details)                HTML     43K 
61: R48         Revenues Performance Obligations (Details)          HTML     47K 
62: R49         Commitments and Contingencies Environmental and     HTML     40K 
                Safety Matters (Details)                                         
63: R50         Commitments and Contingencies Lease Commitments     HTML     52K 
                (Details)                                                        
64: R51         Commitments and Contingencies Commitments for       HTML     30K 
                Construction (Details)                                           
65: R52         Commitments and Contingencies Pipeline Capacity     HTML     48K 
                Agreements (Details)                                             
66: R53         Other Comprehensive Income and Fair Value           HTML     29K 
                Measurements Other Comprehensive Income (Details)                
67: R54         Other Comprehensive Income and Fair Value           HTML     65K 
                Measurements Financial Assets and Liabilities                    
                (Details)                                                        
68: R55         Property, Plant and Equipment Property, Plant and   HTML     61K 
                Equipment Class and Useful Life (Details)                        
69: R56         Property, Plant and Equipment Undivided Interests   HTML     46K 
                (Details)                                                        
70: R57         Property, Plant and Equipment Asset Disposition     HTML     32K 
                and Impairments (Details)                                        
71: R58         Property, Plant and Equipment (Details)             HTML     30K 
72: R59         Goodwill and Intangible Assets Goodwill (Details)   HTML     34K 
73: R60         Goodwill and Intangible Assets Intangible Assets    HTML     53K 
                (Details)                                                        
74: R61         Asset Retirement Obligations (Details)              HTML     45K 
75: R62         Regulatory Assets (Details)                         HTML     41K 
76: R63         Regulatory Assets and Liabilities Regulatory        HTML     40K 
                Liabilities (Details)                                            
77: R64         Financing - Debt (Details)                          HTML    259K 
78: R65         Financing Capital Lease (Details)                   HTML     72K 
79: R66         Financing - Equity (Details)                        HTML     43K 
80: R67         Financing Cash Distributions (Details)              HTML     47K 
81: R68         Employee Benefits (Details)                         HTML     61K 
82: R69         Employee Benefits, Projected Benefit Obligation,    HTML     87K 
                Fair Value of Assets, Funded Status and the                      
                Amounts Not Yet Recognized As Components of Net                  
                Periodic Cost (Details)                                          
83: R70         Employee Benefits, Aggregate Information Related    HTML     37K 
                Only to the Underfunded Plans (Details)                          
84: R71         Employee Benefits, Components of Net Periodic       HTML     59K 
                Benefit Cost (Details)                                           
85: R72         Employee Benefits, Estimated Future Benefit         HTML     46K 
                Payments (Details)                                               
86: R73         Employee Benefits, Weighted-Average Assumptions     HTML     42K 
                Used to Determine Benefit Obligations (Details)                  
87: R74         Employee Benefits, Weighted-Average Assumptions     HTML     54K 
                Used to Determine Net Periodic Benefit Cost                      
                (Details)                                                        
88: R75         Employee Benefits, Master Trust Pension and PBOP    HTML    126K 
                Fair Value Hierarchy (Details)                                   
89: R76         Employee Benefits, Summary of Activity in LTIP      HTML     80K 
                Incentive Compensation Plan (Details)                            
90: R77         Employee Benefits, Valuation Assumptions Under      HTML     39K 
                Unit Appreciation Rights (Details)                               
91: R78         Income Taxes (Details)                              HTML     68K 
92: R79         Credit Risk (Details)                               HTML     42K 
93: R80         Related Party Transactions (Details)                HTML     38K 
94: R81         Supplemental Disclosure of Cash Flow Information    HTML     37K 
                (Details)                                                        
95: R82         Selected Quarterly Financial Data (Unaudited)       HTML     68K 
                (Details)                                                        
96: R83         Guarantee of Securities of Subsidiaries Balance     HTML    188K 
                Sheets (Details)                                                 
97: R84         Guarantee of Securities of Subsidiaries Statements  HTML    155K 
                of Income (Details)                                              
98: R85         Guarantee of Securities of Subsidiaries Statements  HTML     79K 
                of Comprehensive Income (Details)                                
99: R86         Guarantee of Securities of Subsidiaries Statements  HTML    109K 
                of Cash Flows (Details)                                          
101: XML         IDEA XML File -- Filing Summary                      XML    186K  
13: XML         XBRL Instance -- bwp10kq42018_htm                    XML   5.62M 
100: EXCEL       IDEA Workbook of Financial Reports                  XLSX    135K  
 9: EX-101.CAL  XBRL Calculations -- bwp-20181231_cal                XML    292K 
10: EX-101.DEF  XBRL Definitions -- bwp-20181231_def                 XML   1.18M 
11: EX-101.LAB  XBRL Labels -- bwp-20181231_lab                      XML   2.21M 
12: EX-101.PRE  XBRL Presentations -- bwp-20181231_pre               XML   1.43M 
 8: EX-101.SCH  XBRL Schema -- bwp-20181231                          XSD    225K 
102: JSON        XBRL Instance as JSON Data -- MetaLinks              461±   705K  
103: ZIP         XBRL Zipped Folder -- 0001336047-19-000006-xbrl      Zip    453K

‘EX-101.LAB’   —   XBRL Labels — bwp-20181231_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfPartnersCapitalAbstract" xlink:label="loc_us-gaap_StatementOfPartnersCapitalAbstract_EAB405E83136CB839F8EC81125E19822" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_7D348B38EFE5868DF77FC81125E16F2E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729_terseLabel_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partner Type [Axis] </link:label>
<link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729_label_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partner Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729" xlink:to="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_C1C5BFB1A91509EBCC54C81125E19729" xlink:type="arc"/>
<link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362_terseLabel_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partner Type of Partners' Capital Account, Name [Domain] </link:label>
<link:label id="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362_label_en-US" xlink:label="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partner Type of Partners' Capital Account, Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362" xlink:to="lab_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_584426A6E6A834B06E34C81125E12362" xlink:type="arc"/>
<link:label id="lab_us-gaap_LimitedPartnerMember_3658A7C398A66BA1A05AC81125E1EA06_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnerMember_3658A7C398A66BA1A05AC81125E1EA06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Limited Partner </link:label>
<link:label id="lab_us-gaap_LimitedPartnerMember_3658A7C398A66BA1A05AC81125E1EA06_label_en-US" xlink:label="lab_us-gaap_LimitedPartnerMember_3658A7C398A66BA1A05AC81125E1EA06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Limited Partner [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LimitedPartnerMember" xlink:label="loc_us-gaap_LimitedPartnerMember_3658A7C398A66BA1A05AC81125E1EA06" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GeneralPartnerMember_4504BF9AE43D460600E5C81125E13D6E_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnerMember_4504BF9AE43D460600E5C81125E13D6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> General Partner </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GeneralPartnerMember_4504BF9AE43D460600E5C81125E13D6E" xlink:to="lab_us-gaap_GeneralPartnerMember_4504BF9AE43D460600E5C81125E13D6E" xlink:type="arc"/>
<link:label id="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF_terseLabel_en-US" xlink:label="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners' Capital </link:label>
<link:label id="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF_label_en-US" xlink:label="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General Partner and Limited Partner [Member] </link:label>
<link:label id="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF_documentation_en-US" xlink:label="lab_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Parties who together hold 100% interest in the partnership – General Partner interest 51%; Limited Partner interest 49% </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GeneralPartnerandLimitedPartnerMember" xlink:label="loc_bwp_GeneralPartnerandLimitedPartnerMember_0449BBB82847376AD755C81125E1D3EF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnerCapitalComponentsAxis_5103F5CD89A265C0FAF4C81125E1C22E_terseLabel_en-US" xlink:label="lab_us-gaap_PartnerCapitalComponentsAxis_5103F5CD89A265C0FAF4C81125E1C22E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partner Capital Components [Axis] </link:label>
<link:label id="lab_us-gaap_PartnerCapitalComponentsAxis_5103F5CD89A265C0FAF4C81125E1C22E_label_en-US" xlink:label="lab_us-gaap_PartnerCapitalComponentsAxis_5103F5CD89A265C0FAF4C81125E1C22E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partner Capital Components [Axis] </link:label>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6C439E527766891B27FDC81125E128CD_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6C439E527766891B27FDC81125E128CD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comp (Loss) Income </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6C439E527766891B27FDC81125E128CD_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6C439E527766891B27FDC81125E128CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> AOCI Attributable to Parent [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6C439E527766891B27FDC81125E128CD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementClassOfStockAxis_AE7D50D315C6A635A5B2C81125E1878A_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_AE7D50D315C6A635A5B2C81125E1878A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_AE7D50D315C6A635A5B2C81125E1878A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ClassOfStockDomain_73E1366AC43771FCC2DAC81125E10102_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_73E1366AC43771FCC2DAC81125E10102" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_73E1366AC43771FCC2DAC81125E10102" xlink:type="locator"/>
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<link:label id="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6_terseLabel_en-US" xlink:label="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common Units </link:label>
<link:label id="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6_label_en-US" xlink:label="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Units [Member] </link:label>
<link:label id="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6_documentation_en-US" xlink:label="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The capital account balance of the limited partners outstanding common units. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_CommonUnitsMember" xlink:label="loc_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:to="lab_bwp_CommonUnitsMember_6997CE0709DCE63FD2D9C81125E191A6" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementLineItems_70FC5B24AAE4CD4B4E20C81125E1C9EC_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_70FC5B24AAE4CD4B4E20C81125E1C9EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_70FC5B24AAE4CD4B4E20C81125E1C9EC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_4EE15373585D1897AE00C81125E160A6_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_4EE15373585D1897AE00C81125E160A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Partners' Capital [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInPartnersCapitalRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_4EE15373585D1897AE00C81125E160A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract_FC21621FCD2DECC457AAC81125E17A90_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract_FC21621FCD2DECC457AAC81125E17A90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Add (deduct): </link:label>
<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract_FC21621FCD2DECC457AAC81125E17A90_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract_FC21621FCD2DECC457AAC81125E17A90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Additional Paid in Capital [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalAbstract_FC21621FCD2DECC457AAC81125E17A90" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_660CD0C2E6E14D632981C81125E1D57D_periodStartLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_660CD0C2E6E14D632981C81125E1D57D" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning Balance </link:label>
<link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_660CD0C2E6E14D632981C81125E1D57D_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_660CD0C2E6E14D632981C81125E1D57D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partners' Capital, Including Portion Attributable to Noncontrolling Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_660CD0C2E6E14D632981C81125E1D57D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_5B0DFA3C8B7166619788C81125E1936B_terseLabel_en-US" xlink:label="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_5B0DFA3C8B7166619788C81125E1936B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cumulative effect adjustment from the implementation of ASC 606 </link:label>
<link:label id="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_5B0DFA3C8B7166619788C81125E1936B_label_en-US" xlink:label="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_5B0DFA3C8B7166619788C81125E1936B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cumulative Effect of New Accounting Principle in Period of Adoption </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_5B0DFA3C8B7166619788C81125E1936B" xlink:type="locator"/>
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<link:label id="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6_terseLabel_en-US" xlink:label="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustment related to registration rights agreement </link:label>
<link:label id="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6_label_en-US" xlink:label="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Registration Rights Agreement Adjustment </link:label>
<link:label id="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6_documentation_en-US" xlink:label="lab_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Adjustment to Partners’ Capital related to the registration rights agreement reversal. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_RegistrationRightsAgreementAdjustment" xlink:label="loc_bwp_RegistrationRightsAgreementAdjustment_6F493D58A3DFECC03213C81125E1FFC6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetIncomeLoss_927475520258BAA97C67C81125E1B999_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_927475520258BAA97C67C81125E1B999" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net income </link:label>
<link:label id="lab_us-gaap_NetIncomeLoss_927475520258BAA97C67C81125E1B999_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_927475520258BAA97C67C81125E1B999" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Income (Loss) Attributable to Parent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_927475520258BAA97C67C81125E1B999" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalAccountDistributions_B99A5E10B201F1E1B96AC81125E14663_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountDistributions_B99A5E10B201F1E1B96AC81125E14663" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Distributions paid </link:label>
<link:label id="lab_us-gaap_PartnersCapitalAccountDistributions_B99A5E10B201F1E1B96AC81125E14663_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountDistributions_B99A5E10B201F1E1B96AC81125E14663" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partners' Capital Account, Distributions </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalAccountDistributions" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_B99A5E10B201F1E1B96AC81125E14663" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3702BC312E2D4699D7BFC81125E16782_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3702BC312E2D4699D7BFC81125E16782" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss), net of tax </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3702BC312E2D4699D7BFC81125E16782_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3702BC312E2D4699D7BFC81125E16782" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_3702BC312E2D4699D7BFC81125E16782" xlink:type="locator"/>
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<link:label id="lab_bwp_ConversiontoPartnershipInterests_6E66BB781C0B870D8D5DC81125E1832B_terseLabel_en-US" xlink:label="lab_bwp_ConversiontoPartnershipInterests_6E66BB781C0B870D8D5DC81125E1832B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> General Partner purchase of common units and conversion to partnership interests </link:label>
<link:label id="lab_bwp_ConversiontoPartnershipInterests_6E66BB781C0B870D8D5DC81125E1832B_label_en-US" xlink:label="lab_bwp_ConversiontoPartnershipInterests_6E66BB781C0B870D8D5DC81125E1832B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Conversion to Partnership Interests </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_CD3C505A0224D990A7DD5DDD5073240A_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_CD3C505A0224D990A7DD5DDD5073240A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment: </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_CD3C505A0224D990A7DD5DDD5073240A_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_CD3C505A0224D990A7DD5DDD5073240A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_CD3C505A0224D990A7DD5DDD5073240A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_13FF9CF8BA8C357F4FA95DDD5073BC70_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_13FF9CF8BA8C357F4FA95DDD5073BC70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Natural gas transmission and other plant </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentOther_13FF9CF8BA8C357F4FA95DDD5073BC70_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentOther_13FF9CF8BA8C357F4FA95DDD5073BC70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Other, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOther_13FF9CF8BA8C357F4FA95DDD5073BC70" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConstructionInProgressGross_9EC2032D1A585418731F5DDD5073BDDB_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_9EC2032D1A585418731F5DDD5073BDDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Construction work in progress </link:label>
<link:label id="lab_us-gaap_ConstructionInProgressGross_9EC2032D1A585418731F5DDD5073BDDB_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_9EC2032D1A585418731F5DDD5073BDDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Construction in Progress, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_9EC2032D1A585418731F5DDD5073BDDB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_230878D7C50F6B5EFDB85DDD50739F3D_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_230878D7C50F6B5EFDB85DDD50739F3D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, gross </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_230878D7C50F6B5EFDB85DDD50739F3D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_230878D7C50F6B5EFDB85DDD50739F3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_230878D7C50F6B5EFDB85DDD50739F3D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_B325FC5EA194B407D92F5DDD5073455D_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_B325FC5EA194B407D92F5DDD5073455D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Less—accumulated depreciation and amortization </link:label>
<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_B325FC5EA194B407D92F5DDD5073455D_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_B325FC5EA194B407D92F5DDD5073455D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_B325FC5EA194B407D92F5DDD5073455D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_1CAC7285CFC5A45DB9D95DDD507369CA_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_1CAC7285CFC5A45DB9D95DDD507369CA" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, net </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_1CAC7285CFC5A45DB9D95DDD507369CA_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_1CAC7285CFC5A45DB9D95DDD507369CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_1CAC7285CFC5A45DB9D95DDD507369CA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsAbstract_794A7875D67EACFACB115DDD50734CDD_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsAbstract_794A7875D67EACFACB115DDD50734CDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Assets: </link:label>
<link:label id="lab_us-gaap_OtherAssetsAbstract_794A7875D67EACFACB115DDD50734CDD_label_en-US" xlink:label="lab_us-gaap_OtherAssetsAbstract_794A7875D67EACFACB115DDD50734CDD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsAbstract" xlink:label="loc_us-gaap_OtherAssetsAbstract_794A7875D67EACFACB115DDD50734CDD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Goodwill_E0A4A1E9FB49571CC6CC5DDD5073FC3D_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_E0A4A1E9FB49571CC6CC5DDD5073FC3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:label id="lab_us-gaap_Goodwill_E0A4A1E9FB49571CC6CC5DDD5073FC3D_label_en-US" xlink:label="lab_us-gaap_Goodwill_E0A4A1E9FB49571CC6CC5DDD5073FC3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_E0A4A1E9FB49571CC6CC5DDD5073FC3D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryGasInStorageUndergroundNoncurrent_6A194FB7C9AEEE0596585DDD5073FC91_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryGasInStorageUndergroundNoncurrent_6A194FB7C9AEEE0596585DDD5073FC91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gas stored underground </link:label>
<link:label id="lab_us-gaap_InventoryGasInStorageUndergroundNoncurrent_6A194FB7C9AEEE0596585DDD5073FC91_label_en-US" xlink:label="lab_us-gaap_InventoryGasInStorageUndergroundNoncurrent_6A194FB7C9AEEE0596585DDD5073FC91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Gas in Storage Underground, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InventoryGasInStorageUndergroundNoncurrent" xlink:label="loc_us-gaap_InventoryGasInStorageUndergroundNoncurrent_6A194FB7C9AEEE0596585DDD5073FC91" xlink:type="locator"/>
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<link:label id="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60_terseLabel_en-US" xlink:label="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60_label_en-US" xlink:label="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Miscellaneous Other Assets, Noncurrent </link:label>
<link:label id="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60_documentation_en-US" xlink:label="lab_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount of other noncurrent assets not separately identified on the face of the balance sheet. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MiscellaneousOtherAssetsNoncurrent" xlink:label="loc_bwp_MiscellaneousOtherAssetsNoncurrent_F30FB6CA1BBE2788FF915DDD50739F60" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_8E96C84B6B4751C568B35DDD507391B5_totalLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_8E96C84B6B4751C568B35DDD507391B5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsNoncurrent_8E96C84B6B4751C568B35DDD507391B5_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_8E96C84B6B4751C568B35DDD507391B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>
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<link:label id="lab_us-gaap_Assets_CC61E3077181181A8A125DDD5073CC99_terseLabel_en-US" xlink:label="lab_us-gaap_Assets_CC61E3077181181A8A125DDD5073CC99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total Assets </link:label>
<link:label id="lab_us-gaap_Assets_CC61E3077181181A8A125DDD5073CC99_label_en-US" xlink:label="lab_us-gaap_Assets_CC61E3077181181A8A125DDD5073CC99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_CC61E3077181181A8A125DDD5073CC99" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_E2F9206949B88B5EEA655DDD50738B98_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_E2F9206949B88B5EEA655DDD50738B98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIABILITIES AND PARTNERS' CAPITAL </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_E2F9206949B88B5EEA655DDD50738B98_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_E2F9206949B88B5EEA655DDD50738B98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_3EE714676548B82760A95DDD5073634A_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_3EE714676548B82760A95DDD5073634A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current Liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_3EE714676548B82760A95DDD5073634A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_3EE714676548B82760A95DDD5073634A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>
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<link:label id="lab_us-gaap_AccountsPayableCurrentAbstract_7E9F0DF78EA8249B6B615DDD5073DF1A_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAbstract_7E9F0DF78EA8249B6B615DDD5073DF1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payables: </link:label>
<link:label id="lab_us-gaap_AccountsPayableCurrentAbstract_7E9F0DF78EA8249B6B615DDD5073DF1A_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAbstract_7E9F0DF78EA8249B6B615DDD5073DF1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current [Abstract] </link:label>
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<link:label id="lab_us-gaap_AccountsPayableTradeCurrent_218A5FDE93EC4EC513A55DDD5073AF75_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableTradeCurrent_218A5FDE93EC4EC513A55DDD5073AF75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trade </link:label>
<link:label id="lab_us-gaap_AccountsPayableTradeCurrent_218A5FDE93EC4EC513A55DDD5073AF75_label_en-US" xlink:label="lab_us-gaap_AccountsPayableTradeCurrent_218A5FDE93EC4EC513A55DDD5073AF75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Trade, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableTradeCurrent" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_218A5FDE93EC4EC513A55DDD5073AF75" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_151C318E41430D3C742F5DDD507397B1_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_151C318E41430D3C742F5DDD507397B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Affiliates </link:label>
<link:label id="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_151C318E41430D3C742F5DDD507397B1_label_en-US" xlink:label="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_151C318E41430D3C742F5DDD507397B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Related Parties, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_151C318E41430D3C742F5DDD507397B1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344_label_en-US" xlink:label="lab_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Other, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableOtherCurrent" xlink:label="loc_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344" xlink:to="lab_us-gaap_AccountsPayableOtherCurrent_7D2070E2DCF64B1EDA435DDD5073C344" xlink:type="arc"/>
<link:label id="lab_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3_terseLabel_en-US" xlink:label="lab_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gas payables </link:label>
<link:label id="lab_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3_label_en-US" xlink:label="lab_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gas Balancing Payable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GasImbalancePayableCurrent" xlink:label="loc_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3" xlink:to="lab_us-gaap_GasImbalancePayableCurrent_32FE01EA628C257ABB585DDD50822AE3" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_3F07106EE6E80A669EBD5DDD50828E3D_terseLabel_en-US" xlink:label="lab_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_3F07106EE6E80A669EBD5DDD50828E3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued taxes, other </link:label>
<link:label id="lab_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_3F07106EE6E80A669EBD5DDD50828E3D_label_en-US" xlink:label="lab_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_3F07106EE6E80A669EBD5DDD50828E3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrual for Taxes Other than Income Taxes, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent_3F07106EE6E80A669EBD5DDD50828E3D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued interest </link:label>
<link:label id="lab_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9_label_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Payable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9" xlink:to="lab_us-gaap_InterestPayableCurrent_155D796341D3FB7826995DDD508284A9" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued payroll and employee benefits </link:label>
<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee-related Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_1859F19B9949E49EE3D65DDD5082D807" xlink:type="arc"/>
<link:label id="lab_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Construction retainage </link:label>
<link:label id="lab_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1_label_en-US" xlink:label="lab_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Construction Payable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConstructionPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1" xlink:to="lab_us-gaap_ConstructionPayableCurrentAndNoncurrent_5D6442D7515C340A43C75DDD508250E1" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_BE3D9E32FC094CAAC0715DDD5082940D_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_BE3D9E32FC094CAAC0715DDD5082940D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred income </link:label>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_BE3D9E32FC094CAAC0715DDD5082940D_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_BE3D9E32FC094CAAC0715DDD5082940D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_BE3D9E32FC094CAAC0715DDD5082940D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current liabilities </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD" xlink:to="lab_us-gaap_OtherLiabilitiesCurrent_C030DA2010D590E009435DDD5082A6BD" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465" xlink:to="lab_us-gaap_LiabilitiesCurrent_C0D952910EC046DC862B5DDD50828465" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_65D5FB38DF6C7B00D50B5DDD50822CAA_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_65D5FB38DF6C7B00D50B5DDD50822CAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long–term debt and capital lease obligation </link:label>
<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_65D5FB38DF6C7B00D50B5DDD50822CAA_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_65D5FB38DF6C7B00D50B5DDD50822CAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt and Capital Lease Obligations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_65D5FB38DF6C7B00D50B5DDD50822CAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesNoncurrentAbstract_0C78A301DE6EE78080845DDD508206A3_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrentAbstract_0C78A301DE6EE78080845DDD508206A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Liabilities and Deferred Credits: </link:label>
<link:label id="lab_us-gaap_LiabilitiesNoncurrentAbstract_0C78A301DE6EE78080845DDD508206A3_label_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrentAbstract_0C78A301DE6EE78080845DDD508206A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Noncurrent [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_0C78A301DE6EE78080845DDD508206A3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_46A5DCA33E324B1335885DDD5082C8B1_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_46A5DCA33E324B1335885DDD5082C8B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension liability </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_46A5DCA33E324B1335885DDD5082C8B1_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_46A5DCA33E324B1335885DDD5082C8B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liability, Defined Benefit Pension Plan, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent_46A5DCA33E324B1335885DDD5082C8B1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_94640C29C7594D4082535DDD50820F29_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_94640C29C7594D4082535DDD50820F29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Asset retirement obligation </link:label>
<link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_94640C29C7594D4082535DDD50820F29_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_94640C29C7594D4082535DDD50820F29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligations, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationsNoncurrent" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_94640C29C7594D4082535DDD50820F29" xlink:type="locator"/>
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<link:label id="lab_bwp_ProvisionForOtherAssetRetirement_8BFB79A66BFE2ECE1E085DDD5082C962_label_en-US" xlink:label="lab_bwp_ProvisionForOtherAssetRetirement_8BFB79A66BFE2ECE1E085DDD5082C962" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Provision for other asset retirement </link:label>
<link:label id="lab_bwp_ProvisionForOtherAssetRetirement_8BFB79A66BFE2ECE1E085DDD5082C962_documentation_en-US" xlink:label="lab_bwp_ProvisionForOtherAssetRetirement_8BFB79A66BFE2ECE1E085DDD5082C962" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Noncurrent portion of the estimated cost of removal collected in rates for operations where ASC 980 is applicable. These removal liabilities do not represent an existing legal obligation. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ProvisionForOtherAssetRetirement" xlink:label="loc_bwp_ProvisionForOtherAssetRetirement_8BFB79A66BFE2ECE1E085DDD5082C962" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DueToRelatedPartiesNoncurrent_16D570F0A6F178E5AF835DDD50826A82_terseLabel_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesNoncurrent_16D570F0A6F178E5AF835DDD50826A82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payable to affiliate </link:label>
<link:label id="lab_us-gaap_DueToRelatedPartiesNoncurrent_16D570F0A6F178E5AF835DDD50826A82_label_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesNoncurrent_16D570F0A6F178E5AF835DDD50826A82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Due to Related Parties, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_16D570F0A6F178E5AF835DDD50826A82" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_3AEA8E188A48E26AFDE85DDD5082B382" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent_C7613B896ED7C757C7885DDD50822039_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent_C7613B896ED7C757C7885DDD50822039" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other liabilities and deferred credits </link:label>
<link:label id="lab_us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent_C7613B896ED7C757C7885DDD50822039_label_en-US" xlink:label="lab_us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent_C7613B896ED7C757C7885DDD50822039" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Other than Long-term Debt, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent" xlink:label="loc_us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent_C7613B896ED7C757C7885DDD50822039" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingencies_D172E7DA0027B6C7414B5DDD5082C68A_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_D172E7DA0027B6C7414B5DDD5082C68A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_D172E7DA0027B6C7414B5DDD5082C68A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingencies_D172E7DA0027B6C7414B5DDD5082C68A" xlink:to="lab_us-gaap_CommitmentsAndContingencies_D172E7DA0027B6C7414B5DDD5082C68A" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquityAbstract_F58213FA59EA07DFB90D5DDD50829D89_terseLabel_en-US" xlink:label="lab_us-gaap_EquityAbstract_F58213FA59EA07DFB90D5DDD50829D89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners’ Capital: </link:label>
<link:label id="lab_us-gaap_EquityAbstract_F58213FA59EA07DFB90D5DDD50829D89_label_en-US" xlink:label="lab_us-gaap_EquityAbstract_F58213FA59EA07DFB90D5DDD50829D89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityAbstract" xlink:label="loc_us-gaap_EquityAbstract_F58213FA59EA07DFB90D5DDD50829D89" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_7EECB199D98B2C4EA61E5DDD508211D2_terseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount_7EECB199D98B2C4EA61E5DDD508211D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common units – 250.3 million units issued and outstanding December 31, 2017 </link:label>
<link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_7EECB199D98B2C4EA61E5DDD508211D2_label_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount_7EECB199D98B2C4EA61E5DDD508211D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Limited Partners' Capital Account </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LimitedPartnersCapitalAccount" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_7EECB199D98B2C4EA61E5DDD508211D2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_B70C62B35D32953D62C55DDD5082E8F4_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount_B70C62B35D32953D62C55DDD5082E8F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> General partner </link:label>
<link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_B70C62B35D32953D62C55DDD5082E8F4_label_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount_B70C62B35D32953D62C55DDD5082E8F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General Partners' Capital Account </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralPartnersCapitalAccount" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_B70C62B35D32953D62C55DDD5082E8F4" xlink:type="locator"/>
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<link:label id="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB_terseLabel_en-US" xlink:label="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners' capital </link:label>
<link:label id="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB_label_en-US" xlink:label="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General and Limited Partners' Capital Account </link:label>
<link:label id="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB_documentation_en-US" xlink:label="lab_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of the general partners and limited partners ownership interests. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GeneralandLimitedPartnersCapitalAccount" xlink:label="loc_bwp_GeneralandLimitedPartnersCapitalAccount_1845F5101EDC3B428EDB5DDD50820EFB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_275EE729669CF11578185DDD5082DB10_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_275EE729669CF11578185DDD5082DB10" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated other comprehensive loss </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_275EE729669CF11578185DDD5082DB10_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_275EE729669CF11578185DDD5082DB10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_275EE729669CF11578185DDD5082DB10" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_82E02145B0BB6BC67F275DDD50822604_totalLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_82E02145B0BB6BC67F275DDD50822604" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total partners’ capital </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_82E02145B0BB6BC67F275DDD50822604" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_137A73DBB4F942337B205DDD5082536E_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_137A73DBB4F942337B205DDD5082536E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Liabilities and Partners' Capital </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_137A73DBB4F942337B205DDD5082536E_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_137A73DBB4F942337B205DDD5082536E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_137A73DBB4F942337B205DDD5082536E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_08039D5FC8280FEB3E2DC494903A9637_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_08039D5FC8280FEB3E2DC494903A9637" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_08039D5FC8280FEB3E2DC494903A9637" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfGoodwillTable_48B99E992CEE530411D1C494903AFE6D_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_48B99E992CEE530411D1C494903AFE6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Goodwill [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfGoodwillTable_48B99E992CEE530411D1C494903AFE6D_label_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_48B99E992CEE530411D1C494903AFE6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Goodwill [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_48B99E992CEE530411D1C494903AFE6D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_5F1DE5CA7690058F52D4C494903AB96A_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_5F1DE5CA7690058F52D4C494903AB96A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segments [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5F1DE5CA7690058F52D4C494903AB96A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SegmentDomain_959F1D2DD43CFB674DB6C494903A83F4_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_959F1D2DD43CFB674DB6C494903A83F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segments [Domain] </link:label>
<link:label id="lab_us-gaap_SegmentDomain_959F1D2DD43CFB674DB6C494903A83F4_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_959F1D2DD43CFB674DB6C494903A83F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segments [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_959F1D2DD43CFB674DB6C494903A83F4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillLineItems_804CE2AF17DAA3EFC3B4C494903AF14B_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_804CE2AF17DAA3EFC3B4C494903AF14B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill [Line Items] </link:label>
<link:label id="lab_us-gaap_GoodwillLineItems_804CE2AF17DAA3EFC3B4C494903AF14B_label_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_804CE2AF17DAA3EFC3B4C494903AF14B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill [Line Items] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0C997B994B4B7400F197DD2DB1DC7068_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0C997B994B4B7400F197DD2DB1DC7068" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0C997B994B4B7400F197DD2DB1DC7068" xlink:type="locator"/>
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<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_B85BC753DB87DAD1A54CDD2DB1DC2A9F_label_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_B85BC753DB87DAD1A54CDD2DB1DC2A9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit-based Compensation Arrangement by Unit-based Payment Award, Equity Instruments Other than Options, Outstanding Balance, Fair Value </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_B85BC753DB87DAD1A54CDD2DB1DC2A9F_documentation_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_B85BC753DB87DAD1A54CDD2DB1DC2A9F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The fair value of unit appreciation rights outstanding during the reporting period as calculated by applying the disclosed pricing methodology. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue" xlink:label="loc_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_B85BC753DB87DAD1A54CDD2DB1DC2A9F" xlink:type="locator"/>
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<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536_terseLabel_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536_label_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit-based Compensation Arrangement by Unit-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536_documentation_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The fair value of unit appreciation rights, that were granted during the reporting period as calculated by applying the disclosed pricing methodology. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue" xlink:label="loc_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodFairValue_9FF2D3E715D264BF6EF8DD2DB1E22536" xlink:type="locator"/>
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<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6_negatedTerseLabel_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Paid </link:label>
<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6_label_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Paid in Period, Fair Value </link:label>
<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6_documentation_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The fair value of unit appreciation rights, that were paid during the reporting period as calculated by applying the disclosed pricing methodology. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue" xlink:label="loc_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:to="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPaidInPeriodFairValue_FF2A6E07E54C88063583DD2DB1E2F4B6" xlink:type="arc"/>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D_negatedLabel_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Forfeited </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D_label_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit-based Compensation Arrangement by Unit-based Payment Award, Equity Instruments Other than Options, forfeited in Period, Fair Value </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D_documentation_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The fair value of unit appreciation rights, that were forfeited during the reporting period as calculated by applying the disclosed pricing methodology. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue" xlink:label="loc_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:to="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodFairValue_4A1FC74DFDECF8015267DD2DB1E26A6D" xlink:type="arc"/>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_0FECF25010A59006C017DD2DB1E39160_periodEndLabel_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_0FECF25010A59006C017DD2DB1E39160" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Outstanding balance, ending </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_0FECF25010A59006C017DD2DB1E39160" xlink:to="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingBalanceFairValue_0FECF25010A59006C017DD2DB1E39160" xlink:type="arc"/>
<link:label id="lab_bwp_UnitAppreciationRightsAndAllUnitBasedIncentiveCompensationPlansUnitsWeightedAverageVestingPeriodAbstract_98C086EA7E9494B412F9DD2DB1E3142D_label_en-US" xlink:label="lab_bwp_UnitAppreciationRightsAndAllUnitBasedIncentiveCompensationPlansUnitsWeightedAverageVestingPeriodAbstract_98C086EA7E9494B412F9DD2DB1E3142D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit Appreciation Rights and All Unit-Based Incentive Compensation Plans, Units, Weighted-Average Vesting Period [Abstract] </link:label>
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<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331_periodStartLabel_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding balance, beginning </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331_label_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit-based Compensation Arrangement by Unit-based Payment Award, Other Than Options, Outstanding, Weighted Average Vesting Period </link:label>
<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331_documentation_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_CDCEC0A172D3E98D1874DD2DB1E30331" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The weighted average period between the issue date and the vesting date, currently outstanding under the plan, which may be expressed in a decimal value for number of years. </link:label>
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<link:label id="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3_verboseLabel_en-US" xlink:label="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Granted </link:label>
<link:label id="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3_label_en-US" xlink:label="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unit-based Compensation Arrangement by Unit-based Payment Award, Other Than Options, Granted, Weighted Average Vesting Period </link:label>
<link:label id="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3_documentation_en-US" xlink:label="lab_bwp_UnitbasedCompensationArrangementbyUnitbasedPaymentAwardOtherThanOptionsGrantedWeightedAverageVestingPeriod_6ABED7908692100A2959DD2DB1E39DA3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The weighted average period between the issue date and the vesting date, currently outstanding under the plan, which may be expressed in a decimal value for number of years. </link:label>
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<link:label id="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_873595B5BD1613D671EFDD2DB1E4FFA1_periodEndLabel_en-US" xlink:label="lab_bwp_UnitBasedCompensationArrangementByUnitBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageVestingPeriod_873595B5BD1613D671EFDD2DB1E4FFA1" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Outstanding balance, ending </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_34F332441E8FE85E2A48DD2DB1E45E3B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_34F332441E8FE85E2A48DD2DB1E45E3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_34F332441E8FE85E2A48DD2DB1E45E3B" xlink:type="locator"/>
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<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA_verboseLabel_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Closing market price of the common unit </link:label>
<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA_label_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based compensation arrangement by share-based payment award, equity instrument other than options, Closing market price of the common unit </link:label>
<link:label id="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA_documentation_en-US" xlink:label="lab_bwp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsClosingMarketPriceOfCommonUnit_7F280C11FF5481EA7E70DD2DB1E49CDA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The closing market price, per unit, used to determine the fair market value of outstanding awards. </link:label>
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<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_0D5AE4B2EC13A3E1DB96DD2DB1E465BD_verboseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_0D5AE4B2EC13A3E1DB96DD2DB1E465BD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Compensation expense </link:label>
<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_0D5AE4B2EC13A3E1DB96DD2DB1E465BD_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_0D5AE4B2EC13A3E1DB96DD2DB1E465BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Allocated Share-based Compensation Expense </link:label>
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<link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_13D561612158CB63F281DD2DB1E5B406_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_13D561612158CB63F281DD2DB1E5B406" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total estimated remaining unrecognized compensation expense related to the Phantom Common Units </link:label>
<link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_13D561612158CB63F281DD2DB1E5B406_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_13D561612158CB63F281DD2DB1E5B406" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_13D561612158CB63F281DD2DB1E5B406" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_58A2703A2D465F1FAE20DD2DB1E548A1_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_58A2703A2D465F1FAE20DD2DB1E548A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_58A2703A2D465F1FAE20DD2DB1E548A1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased_9F6D5AF9BD61627412D4DD2DB1E5A0D2_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased_9F6D5AF9BD61627412D4DD2DB1E5A0D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased </link:label>
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<link:label id="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E_terseLabel_en-US" xlink:label="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Phantom Units per unit Value after Purchase Transaction </link:label>
<link:label id="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E_label_en-US" xlink:label="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Phantom Units per unit Value after Purchase Transaction </link:label>
<link:label id="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E_documentation_en-US" xlink:label="lab_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Outstanding Phantom Units fair value per unit after Purchase Transaction, plus amounts credited under the DERs. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PhantomUnitsperunitValueafterPurchaseTransaction" xlink:label="loc_bwp_PhantomUnitsperunitValueafterPurchaseTransaction_CF6D07AE7D1734E7565BDD9DE6FE9C3E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract_F93398FB44D613FFF6228728AC934189_label_en-US" xlink:label="lab_us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract_54C45361A2455998A22BF67B4DAF4B56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Assets and Liabilities Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract" xlink:label="loc_us-gaap_RegulatoryAssetsAndLiabilitiesDisclosureAbstract_54C45361A2455998A22BF67B4DAF4B56" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_95AFB8B3BDECB42DD8A1DD2DB191E282_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_95AFB8B3BDECB42DD8A1DD2DB191E282" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Disclosure [Abstract] </link:label>
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<link:label id="lab_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions_B52EE79AE54C5FEC5B63A4A169DC2509_terseLabel_en-US" xlink:label="lab_us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions_B52EE79AE54C5FEC5B63A4A169DC2509" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsidiary, Cumulative Percentage Ownership after All Transactions </link:label>
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<link:label id="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE_terseLabel_en-US" xlink:label="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current assets </link:label>
<link:label id="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE_label_en-US" xlink:label="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Current Assets Consolidating </link:label>
<link:label id="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE_documentation_en-US" xlink:label="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other current assets group for consolidating financial statements. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherCurrentAssetsConsolidating" xlink:label="loc_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:to="lab_bwp_OtherCurrentAssetsConsolidating_7F8510C0C1F9BCEED59CA4A169DE07CE" xlink:type="arc"/>
<link:label id="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69_terseLabel_en-US" xlink:label="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investment in consolidated subsidiaries </link:label>
<link:label id="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69_label_en-US" xlink:label="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment in consolidated subsidiaries </link:label>
<link:label id="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69_documentation_en-US" xlink:label="lab_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The investment in consolidated subsidiaries. This amount is eliminated in consolidation. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_InvestmentInConsolidatedSubsidiaries" xlink:label="loc_bwp_InvestmentInConsolidatedSubsidiaries_3A34BCF6CB2AAECA1142A4A169DEED69" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_BE7B81D93F5250C7B737A4A169DF5702_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_BE7B81D93F5250C7B737A4A169DF5702" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_BE7B81D93F5250C7B737A4A169DF5702" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_B01EDF8BB17EFDF9EE79A4A169DF8018_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_B01EDF8BB17EFDF9EE79A4A169DF8018" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_B01EDF8BB17EFDF9EE79A4A169DF8018" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DueFromRelatedPartiesNoncurrent_75DF73E28CD849395017A4A169DFB22C_terseLabel_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesNoncurrent_75DF73E28CD849395017A4A169DFB22C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advances to affiliates – noncurrent </link:label>
<link:label id="lab_us-gaap_DueFromRelatedPartiesNoncurrent_75DF73E28CD849395017A4A169DFB22C_label_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesNoncurrent_75DF73E28CD849395017A4A169DFB22C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Due from Related Parties, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueFromRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesNoncurrent_75DF73E28CD849395017A4A169DFB22C" xlink:type="locator"/>
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<link:label id="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815_terseLabel_en-US" xlink:label="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other noncurrent assets </link:label>
<link:label id="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815_label_en-US" xlink:label="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Noncurrent Assets Consolidating </link:label>
<link:label id="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815_documentation_en-US" xlink:label="lab_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other noncurrent assets grouped together for the purposes of financial statements prepared in accordance with Rule 3-10 of Regulation S-X. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherNoncurrentAssetsConsolidating" xlink:label="loc_bwp_OtherNoncurrentAssetsConsolidating_E87BBD319B2A2B30C430A4A169DF5815" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Assets_E8626B5B15DEDE7F8ABDA4A169E0817D_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_E8626B5B15DEDE7F8ABDA4A169E0817D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_E8626B5B15DEDE7F8ABDA4A169E0817D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4227894AADBD054E34ECA4A169E0B151_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4227894AADBD054E34ECA4A169E0B151" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities and Partners' Capital </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4227894AADBD054E34ECA4A169E0B151" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableCurrent_F3B553C90AECB858FA0AA4A169E0C2A6_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_F3B553C90AECB858FA0AA4A169E0C2A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payables </link:label>
<link:label id="lab_us-gaap_AccountsPayableCurrent_F3B553C90AECB858FA0AA4A169E0C2A6_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_F3B553C90AECB858FA0AA4A169E0C2A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_F3B553C90AECB858FA0AA4A169E0C2A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_84AC51A7B1A4FC73DA27A4A169E0D470_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_84AC51A7B1A4FC73DA27A4A169E0D470" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Payable to affiliates </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_84AC51A7B1A4FC73DA27A4A169E0D470" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420_terseLabel_en-US" xlink:label="lab_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advances from affiliates </link:label>
<link:label id="lab_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420_label_en-US" xlink:label="lab_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Due to Affiliate, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToAffiliateCurrent" xlink:label="loc_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420" xlink:to="lab_us-gaap_DueToAffiliateCurrent_99C962374068101113ECA4A169E11420" xlink:type="arc"/>
<link:label id="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3_terseLabel_en-US" xlink:label="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current liabilities </link:label>
<link:label id="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3_label_en-US" xlink:label="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Current Liabilities Consolidating </link:label>
<link:label id="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3_documentation_en-US" xlink:label="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other current liabilities grouped together for the purposes of financial statements prepared in accordance with Rule 3-10 of Regulation S-X. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherCurrentLiabilitiesConsolidating" xlink:label="loc_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:to="lab_bwp_OtherCurrentLiabilitiesConsolidating_53850E8D2AA87262407DA4A169E194D3" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_0C0D2DE1D6F32E639D77A4A169E152B4_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_0C0D2DE1D6F32E639D77A4A169E152B4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Long-term debt and capital lease obligation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_0C0D2DE1D6F32E639D77A4A169E152B4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DueToRelatedPartiesNoncurrent_BA390E339D012CBE13D6A4A169E1B6E2_verboseLabel_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesNoncurrent_BA390E339D012CBE13D6A4A169E1B6E2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Payable to affiliate - noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_BA390E339D012CBE13D6A4A169E1B6E2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DueToAffiliateNoncurrent_54433ACB056D22FCBCC3A4A169E14892_terseLabel_en-US" xlink:label="lab_us-gaap_DueToAffiliateNoncurrent_54433ACB056D22FCBCC3A4A169E14892" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advances from affiliates - noncurrent </link:label>
<link:label id="lab_us-gaap_DueToAffiliateNoncurrent_54433ACB056D22FCBCC3A4A169E14892_label_en-US" xlink:label="lab_us-gaap_DueToAffiliateNoncurrent_54433ACB056D22FCBCC3A4A169E14892" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Due to Affiliate, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DueToAffiliateNoncurrent" xlink:label="loc_us-gaap_DueToAffiliateNoncurrent_54433ACB056D22FCBCC3A4A169E14892" xlink:type="locator"/>
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<link:label id="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209_terseLabel_en-US" xlink:label="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other noncurrent liabilities </link:label>
<link:label id="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209_label_en-US" xlink:label="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Noncurrent Liabilities Consolidating </link:label>
<link:label id="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209_documentation_en-US" xlink:label="lab_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other noncurrent liabilities grouped together for the purposes of financial statements prepared in accordance with Rule 3-10 of Regulation S-X. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherNoncurrentLiabilitiesConsolidating" xlink:label="loc_bwp_OtherNoncurrentLiabilitiesConsolidating_0D70CEE676D728868510A4A169E15209" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapital_2BE5C3AE547DACD040A7A4A169E2CEE5_verboseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapital_2BE5C3AE547DACD040A7A4A169E2CEE5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Total partners’ capital </link:label>
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<link:label id="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_C4E1653287D45E5E2847A4DBE8FDE0AF_verboseLabel_en-US" xlink:label="lab_us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_C4E1653287D45E5E2847A4DBE8FDE0AF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Employee Benefits </link:label>
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<link:label id="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_BC0E8999EAC67DDD5303DD2DB21E32B2_terseLabel_en-US" xlink:label="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_BC0E8999EAC67DDD5303DD2DB21E32B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> PBOP </link:label>
<link:label id="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_BC0E8999EAC67DDD5303DD2DB21E32B2_label_en-US" xlink:label="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_BC0E8999EAC67DDD5303DD2DB21E32B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Postretirement Benefits Plan [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_BC0E8999EAC67DDD5303DD2DB21E32B2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_9EBB6E5872CB3CECEBFADD2DB21EACF0_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_9EBB6E5872CB3CECEBFADD2DB21EACF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Plan Assets, Category [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_9EBB6E5872CB3CECEBFADD2DB21EACF0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PlanAssetCategoriesDomain_04F0AE02C5F478A78319DD2DB21FEAB0_label_en-US" xlink:label="lab_us-gaap_PlanAssetCategoriesDomain_04F0AE02C5F478A78319DD2DB21FEAB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Plan Assets, Category [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanAssetCategoriesDomain" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_04F0AE02C5F478A78319DD2DB21FEAB0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_04F0AE02C5F478A78319DD2DB21FEAB0" xlink:to="lab_us-gaap_PlanAssetCategoriesDomain_04F0AE02C5F478A78319DD2DB21FEAB0" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA_terseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity securities </link:label>
<link:label id="lab_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Securities [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="loc_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA" xlink:to="lab_us-gaap_EquitySecuritiesMember_546131C7B75AEA710FB0DD2DB21F41BA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShortTermInvestmentsMember_A6AF5A6B02E4B4EC4DE0DD2DB21FA104_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermInvestmentsMember_A6AF5A6B02E4B4EC4DE0DD2DB21FA104" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Short-term investments </link:label>
<link:label id="lab_us-gaap_ShortTermInvestmentsMember_A6AF5A6B02E4B4EC4DE0DD2DB21FA104_label_en-US" xlink:label="lab_us-gaap_ShortTermInvestmentsMember_A6AF5A6B02E4B4EC4DE0DD2DB21FA104" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Short-term Investments [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_A6AF5A6B02E4B4EC4DE0DD2DB21FA104" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FixedIncomeFundsMember_7FFE50DC84FBA41D4149DD2DB21F2C34_terseLabel_en-US" xlink:label="lab_us-gaap_FixedIncomeFundsMember_7FFE50DC84FBA41D4149DD2DB21F2C34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fixed income mutual funds </link:label>
<link:label id="lab_us-gaap_FixedIncomeFundsMember_7FFE50DC84FBA41D4149DD2DB21F2C34_label_en-US" xlink:label="lab_us-gaap_FixedIncomeFundsMember_7FFE50DC84FBA41D4149DD2DB21F2C34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fixed Income Funds [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FixedIncomeFundsMember" xlink:label="loc_us-gaap_FixedIncomeFundsMember_7FFE50DC84FBA41D4149DD2DB21F2C34" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetBackedSecuritiesMember_23E6D484897DF5339F80DD2DB220DF59_terseLabel_en-US" xlink:label="lab_us-gaap_AssetBackedSecuritiesMember_23E6D484897DF5339F80DD2DB220DF59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Asset-backed securities </link:label>
<link:label id="lab_us-gaap_AssetBackedSecuritiesMember_23E6D484897DF5339F80DD2DB220DF59_label_en-US" xlink:label="lab_us-gaap_AssetBackedSecuritiesMember_23E6D484897DF5339F80DD2DB220DF59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset-backed Securities [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetBackedSecuritiesMember" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_23E6D484897DF5339F80DD2DB220DF59" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CorporateBondSecuritiesMember_983ECA990F08771D5FB5DD2DB2202819_terseLabel_en-US" xlink:label="lab_us-gaap_CorporateBondSecuritiesMember_983ECA990F08771D5FB5DD2DB2202819" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Corporate Bond Securities </link:label>
<link:label id="lab_us-gaap_CorporateBondSecuritiesMember_983ECA990F08771D5FB5DD2DB2202819_label_en-US" xlink:label="lab_us-gaap_CorporateBondSecuritiesMember_983ECA990F08771D5FB5DD2DB2202819" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Corporate Bond Securities [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_983ECA990F08771D5FB5DD2DB2202819" xlink:type="locator"/>
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<link:label id="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046_terseLabel_en-US" xlink:label="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tax Exempt Securities </link:label>
<link:label id="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046_label_en-US" xlink:label="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Tax Exempt Securities [Member] </link:label>
<link:label id="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046_documentation_en-US" xlink:label="lab_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Investments that are tax exempt. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TaxExemptSecuritiesMember" xlink:label="loc_bwp_TaxExemptSecuritiesMember_2E796CD053015AB52A3ADD2DB2208046" xlink:type="locator"/>
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<link:label id="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505_terseLabel_en-US" xlink:label="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Alternative Investments </link:label>
<link:label id="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505_label_en-US" xlink:label="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Alternative Investments [Member] </link:label>
<link:label id="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505_documentation_en-US" xlink:label="lab_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Alternative investments, not including equity, but including limited partnerships. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_AlternativeInvestmentsMember" xlink:label="loc_bwp_AlternativeInvestmentsMember_FF33CBF59D1A857C10C0DD2DB2201505" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_F3CD183A944F5A82E011DD2DB2211B67_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_F3CD183A944F5A82E011DD2DB2211B67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_F3CD183A944F5A82E011DD2DB2211B67" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4E42A2AEEA4F561A0D8DDD2DB22105C1_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4E42A2AEEA4F561A0D8DDD2DB22105C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4E42A2AEEA4F561A0D8DDD2DB22105C1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueInputsLevel1Member_AAE931665B45087CABC5DD2DB2211C5F_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_AAE931665B45087CABC5DD2DB2211C5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel1Member_AAE931665B45087CABC5DD2DB2211C5F_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_AAE931665B45087CABC5DD2DB2211C5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_AAE931665B45087CABC5DD2DB2211C5F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueInputsLevel2Member_4B42D9D9346111E0AD92DD2DB2219721_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_4B42D9D9346111E0AD92DD2DB2219721" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel2Member_4B42D9D9346111E0AD92DD2DB2219721_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_4B42D9D9346111E0AD92DD2DB2219721" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_4B42D9D9346111E0AD92DD2DB2219721" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FairValueInputsLevel3Member_C4F6C4D9C3DE6E5B4DACDD2DB22238F3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_C4F6C4D9C3DE6E5B4DACDD2DB22238F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 3 </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel3Member_C4F6C4D9C3DE6E5B4DACDD2DB22238F3_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_C4F6C4D9C3DE6E5B4DACDD2DB22238F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 3 [Member] </link:label>
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<link:label id="lab_us-gaap_DefinedContributionPlanDisclosureLineItems_2ABF7E323C09B1CEFF70DD2DB22214DC_label_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanDisclosureLineItems_2ABF7E323C09B1CEFF70DD2DB22214DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Contribution Plan Disclosure [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedContributionPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedContributionPlanDisclosureLineItems_2ABF7E323C09B1CEFF70DD2DB22214DC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred Compensation Arrangement with Individual, Distribution Paid </link:label>
<link:label id="lab_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78_label_en-US" xlink:label="lab_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Compensation Arrangement with Individual, Distribution Paid </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78" xlink:to="lab_us-gaap_DeferredCompensationArrangementWithIndividualDistributionPaid_8BE91589877F592BAFE1DDA2E3552E78" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Fair value of plan assets </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Plan Assets, Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF" xlink:to="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_4ED5176F1DD52D2DB702DD2DB22295AF" xlink:type="arc"/>
<link:label id="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918_terseLabel_en-US" xlink:label="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Master Trust percentage of pension plan assets </link:label>
<link:label id="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918_label_en-US" xlink:label="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percentage of pension plan assets </link:label>
<link:label id="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918_documentation_en-US" xlink:label="lab_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The percentage of the fair value of pension plan assets to the fair value of total plan assets held as of the measurement date. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PercentageOfPensionPlanAssets" xlink:label="loc_bwp_PercentageOfPensionPlanAssets_C4CD23AFCD61200EDE76DD2DB223C918" xlink:type="locator"/>
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<link:label id="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE_terseLabel_en-US" xlink:label="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investments, Excluding Net Asset Value, Fair Value Disclosure </link:label>
<link:label id="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE_label_en-US" xlink:label="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investments, Excluding Net Asset Value, Fair Value Disclosure </link:label>
<link:label id="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE_documentation_en-US" xlink:label="lab_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Investments, Excluding Net Asset Value, Fair Value Disclosure </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure" xlink:label="loc_bwp_InvestmentsExcludingNetAssetValueFairValueDisclosure_D5F3970C863393AB138EDD2DB223B5BE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE_terseLabel_en-US" xlink:label="lab_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Alternative Investment </link:label>
<link:label id="lab_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE_label_en-US" xlink:label="lab_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Alternative Investment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AlternativeInvestment" xlink:label="loc_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE" xlink:to="lab_us-gaap_AlternativeInvestment_CAC514B209D9AFC8CB38DD2DB223C0BE" xlink:type="arc"/>
<link:label id="lab_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investments, Fair Value Disclosure </link:label>
<link:label id="lab_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F_label_en-US" xlink:label="lab_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investments, Fair Value Disclosure </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F" xlink:to="lab_us-gaap_InvestmentsFairValueDisclosure_9E701FDCC16E122F9A58DD2DB223024F" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Target Plan Asset Allocations Range (up to) </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Plan Assets, Target Allocation, Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3" xlink:to="lab_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_5FF45341EECFE06A2A15DD2DB22871F3" xlink:type="arc"/>
<link:label id="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0_terseLabel_en-US" xlink:label="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Allocation to fixed income securities </link:label>
<link:label id="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0_label_en-US" xlink:label="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Allocation to fixed income securities </link:label>
<link:label id="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0_documentation_en-US" xlink:label="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The percentage of the fair value of fixed income securities to the fair value of total plan assets held as of the measurement date. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_AllocationToFixedIncomeSecurities" xlink:label="loc_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:to="lab_bwp_AllocationToFixedIncomeSecurities_F7EDD467553B81B71876DD2DB2298BF0" xlink:type="arc"/>
<link:label id="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB_terseLabel_en-US" xlink:label="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount committed to future capital calls in exchange for an ownership interest </link:label>
<link:label id="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB_label_en-US" xlink:label="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amount committed to future capital calls in exchange for an ownership interest </link:label>
<link:label id="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB_documentation_en-US" xlink:label="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount committed to future capital calls from various third party limited partnership investments in exchange for ownership interests in the related partnerships. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest" xlink:label="loc_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:to="lab_bwp_AmountCommittedToFutureCapitalCallsInExchangeForOwnershipInterest_D0FC54A5FB8CDDBDEF08DD2DB22968DB" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) operating activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B9A3CA3B2FE94F6156A4CA17257E7A4E" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_443FF635D850A73A8EA3CA17257E629E_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_443FF635D850A73A8EA3CA17257E629E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> INVESTING ACTIVITIES: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_443FF635D850A73A8EA3CA17257E629E_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_443FF635D850A73A8EA3CA17257E629E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_443FF635D850A73A8EA3CA17257E629E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Capital expenditures </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_E6A5C002C0E99F683E1DCA17257EC1F6" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_8B8A0CD690AEB3B0034FCA17257E1011_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_8B8A0CD690AEB3B0034FCA17257E1011" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from sale of operating assets </link:label>
<link:label id="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_8B8A0CD690AEB3B0034FCA17257E1011_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_8B8A0CD690AEB3B0034FCA17257E1011" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Sale of Productive Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_8B8A0CD690AEB3B0034FCA17257E1011" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_AC83C025373AC0FB6F41CA17257E90F0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_AC83C025373AC0FB6F41CA17257E90F0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Advances to affiliates, net </link:label>
<link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_AC83C025373AC0FB6F41CA17257E90F0_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_AC83C025373AC0FB6F41CA17257E90F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for (Proceeds from) Other Investing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_AC83C025373AC0FB6F41CA17257E90F0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_FAB9CD42C7D01A80A486CA17257E6C0F_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_FAB9CD42C7D01A80A486CA17257E6C0F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) investing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_FAB9CD42C7D01A80A486CA17257E6C0F_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_FAB9CD42C7D01A80A486CA17257E6C0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities, Continuing Operations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_FAB9CD42C7D01A80A486CA17257E6C0F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> FINANCING ACTIVITIES: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_252A547A7C4E50F6C3E1CA17258DAA17" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from long-term debt, net of issuance cost </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Issuance of Unsecured Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromIssuanceOfUnsecuredDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfUnsecuredDebt_D5BCC87EF2A678D04AE0CA17258D6592" xlink:type="arc"/>
<link:label id="lab_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repayment of borrowings from long-term debt </link:label>
<link:label id="lab_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Unsecured Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfUnsecuredDebt" xlink:label="loc_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4" xlink:to="lab_us-gaap_RepaymentsOfUnsecuredDebt_3B00EFC5F1E2DA1A2A61CA17258DCCC4" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from borrowings on revolving credit agreement </link:label>
<link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Long-term Lines of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D" xlink:to="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_DD95861A7697ACB14095CA17258D1D7D" xlink:type="arc"/>
<link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repayment of borrowings on revolving credit agreement, including financing fees </link:label>
<link:label id="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Long-term Lines of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE" xlink:to="lab_us-gaap_RepaymentsOfLongTermLinesOfCredit_6839DDA88A9152B1CBDBCA17258D7AEE" xlink:type="arc"/>
<link:label id="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Principal payment of capital lease obligation </link:label>
<link:label id="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Long-term Capital Lease Obligations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253" xlink:to="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_EE03FBCCBB55FFA65CF9CA17258D0253" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advances from affiliates, net </link:label>
<link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from (Payments for) Other Financing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B" xlink:to="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_0E7AA9C907514C22EE78CA17258DB47B" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_2893DCAB8F0FE3133ABDCA17258D9557_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_2893DCAB8F0FE3133ABDCA17258D9557" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Distributions paid </link:label>
<link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_2893DCAB8F0FE3133ABDCA17258D9557_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_2893DCAB8F0FE3133ABDCA17258D9557" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Ordinary Dividends, Common Stock </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_2893DCAB8F0FE3133ABDCA17258D9557" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_94526F791EE9DC27164ACA17258D209B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_94526F791EE9DC27164ACA17258D209B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash (used in) provided by financing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_94526F791EE9DC27164ACA17258D209B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_94526F791EE9DC27164ACA17258D209B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities, Continuing Operations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_94526F791EE9DC27164ACA17258D209B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_94B8E5DF533202645B94CA17258D9585_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_94B8E5DF533202645B94CA17258D9585" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> (Decrease) increase in cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_94B8E5DF533202645B94CA17258D9585_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_94B8E5DF533202645B94CA17258D9585" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, Period Increase (Decrease) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_94B8E5DF533202645B94CA17258D9585" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_9FA002B178E1A07630FECA17258D85C8_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_9FA002B178E1A07630FECA17258D85C8" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents at beginning of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_9FA002B178E1A07630FECA17258D85C8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DAB2717C3C7253D9B1C7CA17258D6BDD_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DAB2717C3C7253D9B1C7CA17258D6BDD" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents at end of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DAB2717C3C7253D9B1C7CA17258D6BDD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalAbstract_D2AEB5DA42DE286195F58728ADFF0840_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAbstract_C00E4FA92CB25C50BAE577E721E82167" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners' Capital: </link:label>
<link:label id="lab_us-gaap_PartnersCapitalAbstract_D2AEB5DA42DE286195F58728ADFF0840_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAbstract_C00E4FA92CB25C50BAE577E721E82167" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partners' Capital [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalAbstract" xlink:label="loc_us-gaap_PartnersCapitalAbstract_C00E4FA92CB25C50BAE577E721E82167" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementClassOfStockAxis_22E9776BA743DDB6C8518728ADFF75E1_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_B9EB5076F95F5B069C8D4D6515CFA832" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_B9EB5076F95F5B069C8D4D6515CFA832" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ClassOfStockDomain_0F185C1FA5EE23F7270A8728ADFF807D_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_F76B02C7A0C553D3B490433D5AE44E27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
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<link:label id="lab_us-gaap_RevenuesAbstract_17F98F88AA2FB3E92178DD0AA2078213_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_17F98F88AA2FB3E92178DD0AA2078213" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Revenues: </link:label>
<link:label id="lab_us-gaap_RevenuesAbstract_17F98F88AA2FB3E92178DD0AA2078213_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_17F98F88AA2FB3E92178DD0AA2078213" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenues [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_17F98F88AA2FB3E92178DD0AA2078213" xlink:type="locator"/>
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<link:label id="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3_terseLabel_en-US" xlink:label="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Transportation </link:label>
<link:label id="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3_label_en-US" xlink:label="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Transportation Revenue </link:label>
<link:label id="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3_documentation_en-US" xlink:label="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Revenue derived from the regulated generation, transmission and distribution of natural gas. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TransportationRevenue" xlink:label="loc_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:to="lab_bwp_TransportationRevenue_94A2AC0DC23C08DDDC37DD0AA20731B3" xlink:type="arc"/>
<link:label id="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240_terseLabel_en-US" xlink:label="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Storage, parking and lending </link:label>
<link:label id="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240_label_en-US" xlink:label="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Storage, Parking And Lending Revenue </link:label>
<link:label id="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240_documentation_en-US" xlink:label="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Revenues related to providing storage, parking and lending services to customers. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_StorageParkingAndLendingRevenue" xlink:label="loc_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:to="lab_bwp_StorageParkingAndLendingRevenue_8411ACB6A03CF15AC096DD0AA2073240" xlink:type="arc"/>
<link:label id="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00_terseLabel_en-US" xlink:label="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00_label_en-US" xlink:label="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Revenue </link:label>
<link:label id="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00_documentation_en-US" xlink:label="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating revenue other than transportation and storage, parking and lending. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherRevenue" xlink:label="loc_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:to="lab_bwp_OtherRevenue_512BFCF2DC52610D387FDD0AA2081E00" xlink:type="arc"/>
<link:label id="lab_us-gaap_Revenues_8CB3FC834B7EF75EEEE5DD0AA208D500_totalLabel_en-US" xlink:label="lab_us-gaap_Revenues_8CB3FC834B7EF75EEEE5DD0AA208D500" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating revenues </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_8CB3FC834B7EF75EEEE5DD0AA208D500" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_26442ACFCD7B9F8B44BBDD0AA208709A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract_26442ACFCD7B9F8B44BBDD0AA208709A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Costs and Expenses: </link:label>
<link:label id="lab_us-gaap_OperatingCostsAndExpensesAbstract_26442ACFCD7B9F8B44BBDD0AA208709A_label_en-US" xlink:label="lab_us-gaap_OperatingCostsAndExpensesAbstract_26442ACFCD7B9F8B44BBDD0AA208709A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Costs and Expenses [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingCostsAndExpensesAbstract" xlink:label="loc_us-gaap_OperatingCostsAndExpensesAbstract_26442ACFCD7B9F8B44BBDD0AA208709A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FEDA66028623FA31FD47DD0AA208725B_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FEDA66028623FA31FD47DD0AA208725B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fuel and transportation </link:label>
<link:label id="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FEDA66028623FA31FD47DD0AA208725B_label_en-US" xlink:label="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FEDA66028623FA31FD47DD0AA208725B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Domestic Regulated Gas Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfDomesticRegulatedGasRevenue" xlink:label="loc_us-gaap_CostOfDomesticRegulatedGasRevenue_FEDA66028623FA31FD47DD0AA208725B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_35733C0B80EE5B3A4246DD0AA20908DE_terseLabel_en-US" xlink:label="lab_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_35733C0B80EE5B3A4246DD0AA20908DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operation and maintenance </link:label>
<link:label id="lab_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_35733C0B80EE5B3A4246DD0AA20908DE_label_en-US" xlink:label="lab_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_35733C0B80EE5B3A4246DD0AA20908DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Utilities Operating Expense, Maintenance and Operations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations" xlink:label="loc_us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations_35733C0B80EE5B3A4246DD0AA20908DE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_B91C2BEF7676209368D9DD0AA20943E6_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_B91C2BEF7676209368D9DD0AA20943E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Administrative and general </link:label>
<link:label id="lab_us-gaap_GeneralAndAdministrativeExpense_B91C2BEF7676209368D9DD0AA20943E6_label_en-US" xlink:label="lab_us-gaap_GeneralAndAdministrativeExpense_B91C2BEF7676209368D9DD0AA20943E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General and Administrative Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_B91C2BEF7676209368D9DD0AA20943E6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DepreciationAndAmortization_CBB7A19E191C1E8AC1B7DD0AA20990B7_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization_CBB7A19E191C1E8AC1B7DD0AA20990B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>
<link:label id="lab_us-gaap_DepreciationAndAmortization_CBB7A19E191C1E8AC1B7DD0AA20990B7_label_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization_CBB7A19E191C1E8AC1B7DD0AA20990B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization, Nonproduction </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_CBB7A19E191C1E8AC1B7DD0AA20990B7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_58612ACDA5B9BDB096F3DD0AA20956C1_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_58612ACDA5B9BDB096F3DD0AA20956C1" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> (Gain) loss on sale of assets and impairments </link:label>
<link:label id="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_58612ACDA5B9BDB096F3DD0AA20956C1_label_en-US" xlink:label="lab_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_58612ACDA5B9BDB096F3DD0AA20956C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Sale of Assets and Asset Impairment Charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_58612ACDA5B9BDB096F3DD0AA20956C1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TaxesExcludingIncomeAndExciseTaxes_73C63A4E8DADA313568ADD0AA209976F_terseLabel_en-US" xlink:label="lab_us-gaap_TaxesExcludingIncomeAndExciseTaxes_73C63A4E8DADA313568ADD0AA209976F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Taxes other than income taxes </link:label>
<link:label id="lab_us-gaap_TaxesExcludingIncomeAndExciseTaxes_73C63A4E8DADA313568ADD0AA209976F_label_en-US" xlink:label="lab_us-gaap_TaxesExcludingIncomeAndExciseTaxes_73C63A4E8DADA313568ADD0AA209976F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Taxes, Miscellaneous </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TaxesExcludingIncomeAndExciseTaxes" xlink:label="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_73C63A4E8DADA313568ADD0AA209976F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingExpenses_B7818BE4C0B707C8E5ACDD0AA20A79E0_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_B7818BE4C0B707C8E5ACDD0AA20A79E0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating costs and expenses </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_B7818BE4C0B707C8E5ACDD0AA20A79E0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingIncomeLoss_9D501B1F007B21F64BCFDD0AA20A30B4_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_9D501B1F007B21F64BCFDD0AA20A30B4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Operating income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_9D501B1F007B21F64BCFDD0AA20A30B4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestAndDebtExpenseAbstract_2BE70CF92958122206FDDD0AA20AC17C_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestAndDebtExpenseAbstract_2BE70CF92958122206FDDD0AA20AC17C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other Deductions (Income): </link:label>
<link:label id="lab_us-gaap_InterestAndDebtExpenseAbstract_2BE70CF92958122206FDDD0AA20AC17C_label_en-US" xlink:label="lab_us-gaap_InterestAndDebtExpenseAbstract_2BE70CF92958122206FDDD0AA20AC17C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest and Debt Expense [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestAndDebtExpenseAbstract" xlink:label="loc_us-gaap_InterestAndDebtExpenseAbstract_2BE70CF92958122206FDDD0AA20AC17C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestExpense_D0813E8C1CC6E76D2173DD0AA20A140A_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_D0813E8C1CC6E76D2173DD0AA20A140A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense </link:label>
<link:label id="lab_us-gaap_InterestExpense_D0813E8C1CC6E76D2173DD0AA20A140A_label_en-US" xlink:label="lab_us-gaap_InterestExpense_D0813E8C1CC6E76D2173DD0AA20A140A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>
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<link:label id="lab_us-gaap_InvestmentIncomeInterest_A556502795838B6A3157DD0AA20A382B_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_A556502795838B6A3157DD0AA20A382B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Interest income </link:label>
<link:label id="lab_us-gaap_InvestmentIncomeInterest_A556502795838B6A3157DD0AA20A382B_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_A556502795838B6A3157DD0AA20A382B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment Income, Interest </link:label>
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<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_3E9C4B23BF3DFF6EF40BDD0AA20BBAB8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_3E9C4B23BF3DFF6EF40BDD0AA20BBAB8" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Miscellaneous other income, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_3E9C4B23BF3DFF6EF40BDD0AA20BBAB8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NonoperatingIncomeExpense_A7C5B200E9EA6BB7B9F3DD0AA20BE40A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_A7C5B200E9EA6BB7B9F3DD0AA20BE40A" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Total other deductions </link:label>
<link:label id="lab_us-gaap_NonoperatingIncomeExpense_A7C5B200E9EA6BB7B9F3DD0AA20BE40A_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_A7C5B200E9EA6BB7B9F3DD0AA20BE40A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nonoperating Income (Expense) </link:label>
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<link:label id="lab_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_F96F3DDB8EC6FFDC2BB0C469CDE85A78_label_en-US" xlink:label="lab_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_F96F3DDB8EC6FFDC2BB0C469CDE85A78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Distributions Made to Members or Limited Partners [Abstract] </link:label>
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<link:label id="lab_bwp_GeneralPartnerandLimitedPartnerMember_DACD3DE11D507BD2BD21C469CDE90AC1_verboseLabel_en-US" xlink:label="lab_bwp_GeneralPartnerandLimitedPartnerMember_DACD3DE11D507BD2BD21C469CDE90AC1" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> General Partner and Limited Partner </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GeneralPartnerandLimitedPartnerMember" xlink:label="loc_bwp_GeneralPartnerandLimitedPartnerMember_DACD3DE11D507BD2BD21C469CDE90AC1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalAccountDistributions_C2D2E48C85B5359F3B61C469CDEA19B8_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAccountDistributions_C2D2E48C85B5359F3B61C469CDEA19B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners' Capital Account, Distributions </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalAccountDistributions" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_C2D2E48C85B5359F3B61C469CDEA19B8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PartnersCapitalDistributionAmountPerShare_7CEBE3E274B48F7A22F4C469CDEA23CA_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalDistributionAmountPerShare_7CEBE3E274B48F7A22F4C469CDEA23CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Distribution per Unit </link:label>
<link:label id="lab_us-gaap_PartnersCapitalDistributionAmountPerShare_7CEBE3E274B48F7A22F4C469CDEA23CA_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalDistributionAmountPerShare_7CEBE3E274B48F7A22F4C469CDEA23CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Partners' Capital, Distribution Amount Per Share </link:label>
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<link:label id="lab_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_8FA9BC3D3041AF2A5AD6C469CDEAB06D_verboseLabel_en-US" xlink:label="lab_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_8FA9BC3D3041AF2A5AD6C469CDEAB06D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amount Paid to Common Unitholders </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_8FA9BC3D3041AF2A5AD6C469CDEAB06D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GeneralPartnersCapitalAccountDistributionAmount_EE7A44988B627A544031C469CDEA06D8_terseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccountDistributionAmount_EE7A44988B627A544031C469CDEA06D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount Paid to General Partner </link:label>
<link:label id="lab_us-gaap_GeneralPartnersCapitalAccountDistributionAmount_EE7A44988B627A544031C469CDEA06D8_label_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccountDistributionAmount_EE7A44988B627A544031C469CDEA06D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General Partners' Capital Account, Period Distribution Amount </link:label>
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<link:label id="lab_us-gaap_IncentiveDistributionDistributionPerYear_C54D61ABDB92F79EE02CC469CDEB3028_terseLabel_en-US" xlink:label="lab_us-gaap_IncentiveDistributionDistributionPerYear_C54D61ABDB92F79EE02CC469CDEB3028" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Incentive Distribution, Distribution </link:label>
<link:label id="lab_us-gaap_IncentiveDistributionDistributionPerYear_C54D61ABDB92F79EE02CC469CDEB3028_label_en-US" xlink:label="lab_us-gaap_IncentiveDistributionDistributionPerYear_C54D61ABDB92F79EE02CC469CDEB3028" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Incentive Distribution, Distribution </link:label>
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<link:label id="lab_us-gaap_FairValueDisclosuresAbstract_4BB0DBC018BDCACF0531A4DBE9A679B5_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_4BB0DBC018BDCACF0531A4DBE9A679B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Disclosures [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_4BB0DBC018BDCACF0531A4DBE9A679B5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_F0CFF66C3B4E5E1B3B54A4DBE9A68FE6_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_F0CFF66C3B4E5E1B3B54A4DBE9A68FE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income </link:label>
<link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_F0CFF66C3B4E5E1B3B54A4DBE9A68FE6_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_F0CFF66C3B4E5E1B3B54A4DBE9A68FE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Comprehensive Income (Loss) Note [Text Block] </link:label>
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<link:label id="lab_bwp_PeriodOfRecoveryMinimum_772566D410B847239F6EA530DBBB0491_verboseLabel_en-US" xlink:label="lab_bwp_PeriodOfRecoveryMinimum_772566D410B847239F6EA530DBBB0491" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Period of recovery-minimum (in years) </link:label>
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<link:label id="lab_us-gaap_ScheduleOfRegulatoryAssetsTable_F34631FD77425920307BA530DBBB739F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRegulatoryAssetsTable_F34631FD77425920307BA530DBBB739F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Regulatory Assets [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRegulatoryAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRegulatoryAssetsTable_F34631FD77425920307BA530DBBB739F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryAssetAxis_CA77C891AA183A668273A530DBBB21D6_label_en-US" xlink:label="lab_us-gaap_RegulatoryAssetAxis_CA77C891AA183A668273A530DBBB21D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Asset [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryAssetAxis" xlink:label="loc_us-gaap_RegulatoryAssetAxis_CA77C891AA183A668273A530DBBB21D6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryAssetAxis_CA77C891AA183A668273A530DBBB21D6" xlink:to="lab_us-gaap_RegulatoryAssetAxis_CA77C891AA183A668273A530DBBB21D6" xlink:type="arc"/>
<link:label id="lab_us-gaap_RegulatoryAssetDomain_42D89609D8BE969D4846A530DBBC52A8_label_en-US" xlink:label="lab_us-gaap_RegulatoryAssetDomain_42D89609D8BE969D4846A530DBBC52A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Asset [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryAssetDomain" xlink:label="loc_us-gaap_RegulatoryAssetDomain_42D89609D8BE969D4846A530DBBC52A8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F_terseLabel_en-US" xlink:label="lab_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension </link:label>
<link:label id="lab_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F_label_en-US" xlink:label="lab_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PensionCostsMember" xlink:label="loc_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F" xlink:to="lab_us-gaap_PensionCostsMember_9E40EE93999F057482CFA530DBBC042F" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredIncomeTaxChargesMember_6D10E4B706AC60F1FC96A530DBBCEEB5_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxChargesMember_6D10E4B706AC60F1FC96A530DBBCEEB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tax effect of AFUDC equity </link:label>
<link:label id="lab_us-gaap_DeferredIncomeTaxChargesMember_6D10E4B706AC60F1FC96A530DBBCEEB5_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxChargesMember_6D10E4B706AC60F1FC96A530DBBCEEB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Tax Charge [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxChargesMember" xlink:label="loc_us-gaap_DeferredIncomeTaxChargesMember_6D10E4B706AC60F1FC96A530DBBCEEB5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredFuelCostsMember_4A29C5B52D9FDE163CBEA548101057C4_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFuelCostsMember_4A29C5B52D9FDE163CBEA548101057C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fuel tracker </link:label>
<link:label id="lab_us-gaap_DeferredFuelCostsMember_4A29C5B52D9FDE163CBEA548101057C4_label_en-US" xlink:label="lab_us-gaap_DeferredFuelCostsMember_4A29C5B52D9FDE163CBEA548101057C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Fuel Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFuelCostsMember" xlink:label="loc_us-gaap_DeferredFuelCostsMember_4A29C5B52D9FDE163CBEA548101057C4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryAssetLineItems_1C3DE01305363016D39FA530DBBCB6B2_label_en-US" xlink:label="lab_us-gaap_RegulatoryAssetLineItems_1C3DE01305363016D39FA530DBBCB6B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Assets [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryAssetLineItems" xlink:label="loc_us-gaap_RegulatoryAssetLineItems_1C3DE01305363016D39FA530DBBCB6B2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryAssets_8CC1D6C699F6B15A5E8CA530DBBCEA6B_label_en-US" xlink:label="lab_us-gaap_RegulatoryAssets_8CC1D6C699F6B15A5E8CA530DBBCEA6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryAssets" xlink:label="loc_us-gaap_RegulatoryAssets_8CC1D6C699F6B15A5E8CA530DBBCEA6B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryAssets_8CC1D6C699F6B15A5E8CA530DBBCEA6B" xlink:to="lab_us-gaap_RegulatoryAssets_8CC1D6C699F6B15A5E8CA530DBBCEA6B" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_3143B8C393495ECBF8B68728AAA310A4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_C97AABC0ED4D5B60BAA7B17BCD10DD23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Cash Flow, Supplemental Disclosures </link:label>
<link:label id="lab_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_3143B8C393495ECBF8B68728AAA310A4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_C97AABC0ED4D5B60BAA7B17BCD10DD23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_C97AABC0ED4D5B60BAA7B17BCD10DD23" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_44341D1D86F4CB914520CDB282A4C6AA_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_44341D1D86F4CB914520CDB282A4C6AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCostAbstract_44341D1D86F4CB914520CDB282A4C6AA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanServiceCost_736271D39255948B23C5CDB282A4DA8A_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanServiceCost_736271D39255948B23C5CDB282A4DA8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Service cost </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanServiceCost_736271D39255948B23C5CDB282A4DA8A_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanServiceCost_736271D39255948B23C5CDB282A4DA8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Service Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_736271D39255948B23C5CDB282A4DA8A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanInterestCost_67D013636FA9F273B032CDB282A4A4F1_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanInterestCost_67D013636FA9F273B032CDB282A4A4F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest cost </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanInterestCost_67D013636FA9F273B032CDB282A4A4F1_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanInterestCost_67D013636FA9F273B032CDB282A4A4F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Interest Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_67D013636FA9F273B032CDB282A4A4F1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_248160FB40051E79846FCDB282A5A3B6_negatedLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_248160FB40051E79846FCDB282A5A3B6" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Expected return on plan assets </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_248160FB40051E79846FCDB282A5A3B6_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_248160FB40051E79846FCDB282A5A3B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Return (Loss) on Plan Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_248160FB40051E79846FCDB282A5A3B6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_CF22EDBFF64CECABC560CDB282A5B561_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_CF22EDBFF64CECABC560CDB282A5B561" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of prior service credit </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_CF22EDBFF64CECABC560CDB282A5B561_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_CF22EDBFF64CECABC560CDB282A5B561" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Amortization of Prior Service Cost (Credit) </link:label>
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<link:label id="lab_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_3D28FFB86EC84760C558CDB282A5C38E_negatedLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_3D28FFB86EC84760C558CDB282A5C38E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Amortization of unrecognized net loss </link:label>
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<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AA0BB94388A47C8CE8D6CDB282A5B182_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AA0BB94388A47C8CE8D6CDB282A5B182" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Settlement charge </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AA0BB94388A47C8CE8D6CDB282A5B182_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AA0BB94388A47C8CE8D6CDB282A5B182" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_AA0BB94388A47C8CE8D6CDB282A5B182" xlink:type="locator"/>
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<link:label id="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E_terseLabel_en-US" xlink:label="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Future rate recovery </link:label>
<link:label id="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E_label_en-US" xlink:label="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Future rate recovery </link:label>
<link:label id="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E_documentation_en-US" xlink:label="lab_bwp_FutureRateRecovery_D50AF4A3CAA3F0657FE5CDB282A5AA3E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Description of the amount of annual pension plan costs that the entity is permitted to seek for future recovery in future rate cases. </link:label>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_AB0CE251D882897C5DD0A4DBE9773E6D_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_AB0CE251D882897C5DD0A4DBE9773E6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets </link:label>
<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_AB0CE251D882897C5DD0A4DBE9773E6D_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_AB0CE251D882897C5DD0A4DBE9773E6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_F1E50EF88CAAE7AF77838728AB0FABBF_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByBalanceSheetGroupingTextBlock_E3BEF63BBBF5545CAF31004A6614665E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, by Balance Sheet Grouping </link:label>
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<link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_3ADEAD9070419E23AE605599826EF87E_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain_3ADEAD9070419E23AE605599826EF87E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Measurement [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3ADEAD9070419E23AE605599826EF87E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_FFDE7B55476B5FB7DBDE5599826E697D_terseLabel_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_FFDE7B55476B5FB7DBDE5599826E697D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Portion at Fair Value, Fair Value Disclosure </link:label>
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<link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_9DFE603180CB3FF953455599826EBDCF_terseLabel_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_9DFE603180CB3FF953455599826EBDCF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Carrying Value </link:label>
<link:label id="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_9DFE603180CB3FF953455599826EBDCF_label_en-US" xlink:label="lab_us-gaap_CarryingReportedAmountFairValueDisclosureMember_9DFE603180CB3FF953455599826EBDCF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reported Value Measurement [Member] </link:label>
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<link:label id="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A45864E01FFD242D0EC5599826EB829_terseLabel_en-US" xlink:label="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A45864E01FFD242D0EC5599826EB829" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value </link:label>
<link:label id="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A45864E01FFD242D0EC5599826EB829_label_en-US" xlink:label="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2A45864E01FFD242D0EC5599826EB829" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Estimate of Fair Value Measurement [Member] </link:label>
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<link:label id="lab_bwp_PercentofGeneralPartnerInterestOwnedbyHoldingCompany_00E5546DC8349FD92E90B8D528FA56F5_documentation_en-US" xlink:label="lab_bwp_PercentofGeneralPartnerInterestOwnedbyHoldingCompany_00E5546DC8349FD92E90B8D528FA56F5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The percent of the general partner interest owned by the holding company. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PercentofGeneralPartnerInterestOwnedbyHoldingCompany" xlink:label="loc_bwp_PercentofGeneralPartnerInterestOwnedbyHoldingCompany_00E5546DC8349FD92E90B8D528FA56F5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RisksAndUncertaintiesAbstract_21899823B1F1BC6E1684A4DBE8717E64_label_en-US" xlink:label="lab_us-gaap_RisksAndUncertaintiesAbstract_21899823B1F1BC6E1684A4DBE8717E64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Risks and Uncertainties [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RisksAndUncertaintiesAbstract" xlink:label="loc_us-gaap_RisksAndUncertaintiesAbstract_21899823B1F1BC6E1684A4DBE8717E64" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9_verboseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Credit Risk </link:label>
<link:label id="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskDisclosureTextBlock" xlink:label="loc_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9" xlink:to="lab_us-gaap_ConcentrationRiskDisclosureTextBlock_4BAE73156BE66E158AD8A4DBE8714AA9" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountingPoliciesAbstract_2EB3A1F76F8C4CAB1159C4921AF5B07F_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_2EB3A1F76F8C4CAB1159C4921AF5B07F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounting Policies [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_2EB3A1F76F8C4CAB1159C4921AF5B07F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_2EB3A1F76F8C4CAB1159C4921AF5B07F" xlink:to="lab_us-gaap_AccountingPoliciesAbstract_2EB3A1F76F8C4CAB1159C4921AF5B07F" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of New Accounting Pronouncements and Changes in Accounting Principles </link:label>
<link:label id="lab_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B" xlink:to="lab_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_5DA449AA8F1D1E2971D9C4921AF5B39B" xlink:type="arc"/>
<link:label id="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3_verboseLabel_en-US" xlink:label="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Capitalized Interest and Allowance for Borrowed Funds </link:label>
<link:label id="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3_label_en-US" xlink:label="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Summary of Capitalized Interest and Allowance for Borrowed Funds [Table Text Block] </link:label>
<link:label id="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3_documentation_en-US" xlink:label="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The component of capitalized interest and the allowance for funds used during construction during the period based. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock" xlink:label="loc_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:to="lab_bwp_SummaryOfCapitalizedInterestAndAllowanceForBorrowedFundsTableTextBlock_EAB4E90056FD745291FDC4921AF5F4E3" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_856CA71DFC62679FFC658728A9D8096B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_161C1ED70F505D2D9C3B85B2599E97FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Property, Plant and Equipment [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_856CA71DFC62679FFC658728A9D8096B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_161C1ED70F505D2D9C3B85B2599E97FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_161C1ED70F505D2D9C3B85B2599E97FF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_161C1ED70F505D2D9C3B85B2599E97FF" xlink:to="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_161C1ED70F505D2D9C3B85B2599E97FF" xlink:type="arc"/>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_106EBA7DFA55BA6B76A68728A9D99715_terseLabel_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Type of Asset Depreciable or Non Depreciable [Axis] </link:label>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_106EBA7DFA55BA6B76A68728A9D99715_label_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Type of Asset Depreciable or Non Depreciable [Axis] </link:label>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_106EBA7DFA55BA6B76A68728A9D99715_documentation_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment that are either depreciable or non-depreciable. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TypeOfAssetDepreciableOrNonDepreciableAxis" xlink:label="loc_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:to="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableAxis_934B47A869175E9195A4232B887076B1" xlink:type="arc"/>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_8FA848047B6D6BB064528728A9DA5FF6_terseLabel_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Type of Asset Depreciable or Non Depreciable [Domain] </link:label>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_8FA848047B6D6BB064528728A9DA5FF6_label_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Type of Asset Depreciable or Non Depreciable [Domain] </link:label>
<link:label id="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_8FA848047B6D6BB064528728A9DA5FF6_documentation_en-US" xlink:label="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment that are either depreciable or non-depreciable. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TypeOfAssetDepreciableOrNonDepreciableDomain" xlink:label="loc_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:to="lab_bwp_TypeOfAssetDepreciableOrNonDepreciableDomain_3FD541B20DB4557AA81F79BC3A40528B" xlink:type="arc"/>
<link:label id="lab_bwp_DepreciablePlantMember_58479F66BE5102AE007C8728A9DA36DD_terseLabel_en-US" xlink:label="lab_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciable plant: </link:label>
<link:label id="lab_bwp_DepreciablePlantMember_58479F66BE5102AE007C8728A9DA36DD_label_en-US" xlink:label="lab_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciable Plant [Member] </link:label>
<link:label id="lab_bwp_DepreciablePlantMember_58479F66BE5102AE007C8728A9DA36DD_documentation_en-US" xlink:label="lab_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment elements that are depreciated during period. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_DepreciablePlantMember" xlink:label="loc_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:to="lab_bwp_DepreciablePlantMember_756456C4A8BE51E9B0D7D663EAE1A687" xlink:type="arc"/>
<link:label id="lab_bwp_NonDepreciableMember_4C2C5872BDC7910C11318728A9E0D33D_terseLabel_en-US" xlink:label="lab_bwp_NonDepreciableMember_F9D67CF1278558759950FCE15A215555" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-depreciable: </link:label>
<link:label id="lab_bwp_NonDepreciableMember_4C2C5872BDC7910C11318728A9E0D33D_label_en-US" xlink:label="lab_bwp_NonDepreciableMember_F9D67CF1278558759950FCE15A215555" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Non-Depreciable [Member] </link:label>
<link:label id="lab_bwp_NonDepreciableMember_4C2C5872BDC7910C11318728A9E0D33D_documentation_en-US" xlink:label="lab_bwp_NonDepreciableMember_F9D67CF1278558759950FCE15A215555" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment items that are not depreciated during period. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_NonDepreciableMember" xlink:label="loc_bwp_NonDepreciableMember_F9D67CF1278558759950FCE15A215555" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_23D63AF178C5786AAC3B8728A9E03817_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7DB09E23B5245C90AF4B439B4113FE81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_23D63AF178C5786AAC3B8728A9E03817_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7DB09E23B5245C90AF4B439B4113FE81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7DB09E23B5245C90AF4B439B4113FE81" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_FF0B5F799CCFE8F4664F8728A9E163C5_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_B3F74AA161865D78A863B9BB2ABD2CAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_FF0B5F799CCFE8F4664F8728A9E163C5_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_B3F74AA161865D78A863B9BB2ABD2CAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_B3F74AA161865D78A863B9BB2ABD2CAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GasTransmissionEquipmentMember_9CCF3B7A036739FF21438728A9E12B7D_terseLabel_en-US" xlink:label="lab_us-gaap_GasTransmissionEquipmentMember_614778FC1D0E5BACB3E05489AD00C3D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Transmission </link:label>
<link:label id="lab_us-gaap_GasTransmissionEquipmentMember_9CCF3B7A036739FF21438728A9E12B7D_label_en-US" xlink:label="lab_us-gaap_GasTransmissionEquipmentMember_614778FC1D0E5BACB3E05489AD00C3D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gas Transmission Equipment [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GasTransmissionEquipmentMember" xlink:label="loc_us-gaap_GasTransmissionEquipmentMember_614778FC1D0E5BACB3E05489AD00C3D3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GasTransmissionEquipmentMember_614778FC1D0E5BACB3E05489AD00C3D3" xlink:to="lab_us-gaap_GasTransmissionEquipmentMember_614778FC1D0E5BACB3E05489AD00C3D3" xlink:type="arc"/>
<link:label id="lab_bwp_StorageMember_B3DF2F22D8AF9005AC158728A9E172E4_terseLabel_en-US" xlink:label="lab_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Storage </link:label>
<link:label id="lab_bwp_StorageMember_B3DF2F22D8AF9005AC158728A9E172E4_label_en-US" xlink:label="lab_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Storage [Member] </link:label>
<link:label id="lab_bwp_StorageMember_B3DF2F22D8AF9005AC158728A9E172E4_documentation_en-US" xlink:label="lab_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment that are associated with the storage of natural gas. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_StorageMember" xlink:label="loc_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:to="lab_bwp_StorageMember_C24B9D40EBA859FF95D80C93CA63267E" xlink:type="arc"/>
<link:label id="lab_us-gaap_GasGatheringAndProcessingEquipmentMember_74A3BBA914DF89FD7D3C8728A9E25B46_terseLabel_en-US" xlink:label="lab_us-gaap_GasGatheringAndProcessingEquipmentMember_40B7BC708612551B8532EEB753FC6EE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gathering </link:label>
<link:label id="lab_us-gaap_GasGatheringAndProcessingEquipmentMember_74A3BBA914DF89FD7D3C8728A9E25B46_label_en-US" xlink:label="lab_us-gaap_GasGatheringAndProcessingEquipmentMember_40B7BC708612551B8532EEB753FC6EE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gas Gathering and Processing Equipment [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GasGatheringAndProcessingEquipmentMember" xlink:label="loc_us-gaap_GasGatheringAndProcessingEquipmentMember_40B7BC708612551B8532EEB753FC6EE0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GasGatheringAndProcessingEquipmentMember_40B7BC708612551B8532EEB753FC6EE0" xlink:to="lab_us-gaap_GasGatheringAndProcessingEquipmentMember_40B7BC708612551B8532EEB753FC6EE0" xlink:type="arc"/>
<link:label id="lab_bwp_GeneralMember_F40EA785522AAA1E2A898728A9E21B64_terseLabel_en-US" xlink:label="lab_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> General </link:label>
<link:label id="lab_bwp_GeneralMember_F40EA785522AAA1E2A898728A9E21B64_label_en-US" xlink:label="lab_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> General [Member] </link:label>
<link:label id="lab_bwp_GeneralMember_F40EA785522AAA1E2A898728A9E21B64_documentation_en-US" xlink:label="lab_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment that do not fit into the other categories. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GeneralMember" xlink:label="loc_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:to="lab_bwp_GeneralMember_04DC1F8DB3DD5167A48C4E2ED41F8058" xlink:type="arc"/>
<link:label id="lab_bwp_RightsOfWayAndOtherMember_7C2064A4D3D53B1AA6988728A9E21921_terseLabel_en-US" xlink:label="lab_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Rights of way and other </link:label>
<link:label id="lab_bwp_RightsOfWayAndOtherMember_7C2064A4D3D53B1AA6988728A9E21921_label_en-US" xlink:label="lab_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Rights of Way and Other [Member] </link:label>
<link:label id="lab_bwp_RightsOfWayAndOtherMember_7C2064A4D3D53B1AA6988728A9E21921_documentation_en-US" xlink:label="lab_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Land not owned but used for gas transmission pipelines and other equipment. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_RightsOfWayAndOtherMember" xlink:label="loc_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:to="lab_bwp_RightsOfWayAndOtherMember_DDF072A158CF5BDEA1052D9F93864895" xlink:type="arc"/>
<link:label id="lab_us-gaap_ConstructionInProgressMember_A32C586FD8556C4A87768728A9E37C6F_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_360CA8171E8D5CB1BD6DCC0DC03CC5A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Construction work in progress </link:label>
<link:label id="lab_us-gaap_ConstructionInProgressMember_A32C586FD8556C4A87768728A9E37C6F_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_360CA8171E8D5CB1BD6DCC0DC03CC5A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Construction in Progress [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_360CA8171E8D5CB1BD6DCC0DC03CC5A2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionInProgressMember_360CA8171E8D5CB1BD6DCC0DC03CC5A2" xlink:to="lab_us-gaap_ConstructionInProgressMember_360CA8171E8D5CB1BD6DCC0DC03CC5A2" xlink:type="arc"/>
<link:label id="lab_us-gaap_LandMember_D8AB44E08809BE30DD778728A9E36983_terseLabel_en-US" xlink:label="lab_us-gaap_LandMember_F316505CBA4256CBB5DEF02AD4A30268" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Land </link:label>
<link:label id="lab_us-gaap_LandMember_D8AB44E08809BE30DD778728A9E36983_label_en-US" xlink:label="lab_us-gaap_LandMember_F316505CBA4256CBB5DEF02AD4A30268" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Land [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_F316505CBA4256CBB5DEF02AD4A30268" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LandMember_F316505CBA4256CBB5DEF02AD4A30268" xlink:to="lab_us-gaap_LandMember_F316505CBA4256CBB5DEF02AD4A30268" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_B369A09F6D8EF2EC99718728A9E3EF87_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_0CF09276DC175F30A49C2AF1FD5A7A4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_B369A09F6D8EF2EC99718728A9E3EF87_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_0CF09276DC175F30A49C2AF1FD5A7A4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0CF09276DC175F30A49C2AF1FD5A7A4C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0CF09276DC175F30A49C2AF1FD5A7A4C" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_0CF09276DC175F30A49C2AF1FD5A7A4C" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_0273301B1231BE4601FB8728A9E32C3D_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_12A5775368D15ECA8DD8C5266C72049E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Total PPE </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_12A5775368D15ECA8DD8C5266C72049E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_12A5775368D15ECA8DD8C5266C72049E" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGross_12A5775368D15ECA8DD8C5266C72049E" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_A0EDD4E12F45646BDA0A8728A9E4BB10_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_C629EB665FD8542BA4D0CD0751CCE8B5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-Average Useful Lives (Years) </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_A0EDD4E12F45646BDA0A8728A9E4BB10_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_C629EB665FD8542BA4D0CD0751CCE8B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Useful Life </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_C629EB665FD8542BA4D0CD0751CCE8B5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_C629EB665FD8542BA4D0CD0751CCE8B5" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_C629EB665FD8542BA4D0CD0751CCE8B5" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_D3315B34A11D5A1F5BBD8728A9E4155D_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_FA56C68911E857FAA17CBD8B0BA3DA68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Less—accumulated depreciation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_FA56C68911E857FAA17CBD8B0BA3DA68" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_FA56C68911E857FAA17CBD8B0BA3DA68" xlink:to="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_FA56C68911E857FAA17CBD8B0BA3DA68" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_0D4B84D4D68C87722D4E8728A9E40FFA_verboseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_08975604F9AD501F96FB44D7A514B34B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Total PPE, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_08975604F9AD501F96FB44D7A514B34B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_08975604F9AD501F96FB44D7A514B34B" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_08975604F9AD501F96FB44D7A514B34B" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_D17F88072D3ED30F82588728A9F252E5_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_03164115A1345266B092A0E23682E1CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets </link:label>
<link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_D17F88072D3ED30F82588728A9F252E5_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_03164115A1345266B092A0E23682E1CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_03164115A1345266B092A0E23682E1CA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_03164115A1345266B092A0E23682E1CA" xlink:to="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_03164115A1345266B092A0E23682E1CA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_3B2FEBDDBB8BDBD2EF318728A9F36B90_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_6A49B62996D55AE7AAF0C345BCA9CCDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets, Future Amortization Expense </link:label>
<link:label id="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_3B2FEBDDBB8BDBD2EF318728A9F36B90_label_en-US" xlink:label="lab_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_6A49B62996D55AE7AAF0C345BCA9CCDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_6A49B62996D55AE7AAF0C345BCA9CCDC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> SRP </link:label>
<link:label id="lab_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46_label_en-US" xlink:label="lab_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Employee Retirement Plan [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46" xlink:to="lab_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_1DDB148D90A15681B6AEA54AFF1A1D46" xlink:type="arc"/>
<link:label id="lab_bwp_RequiredAmountOfFundingOfPeriodicPensionCost_D5433CC6C8708C3E1DCBA54AFF1AFDEC_label_en-US" xlink:label="lab_bwp_RequiredAmountOfFundingOfPeriodicPensionCost_D5433CC6C8708C3E1DCBA54AFF1AFDEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Required amount of funding of periodic pension cost </link:label>
<link:label id="lab_bwp_RequiredAmountOfFundingOfPeriodicPensionCost_D5433CC6C8708C3E1DCBA54AFF1AFDEC_documentation_en-US" xlink:label="lab_bwp_RequiredAmountOfFundingOfPeriodicPensionCost_D5433CC6C8708C3E1DCBA54AFF1AFDEC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount of required funding of periodic pension costs under a pension plan which is the amount included in rates. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_RequiredAmountOfFundingOfPeriodicPensionCost" xlink:label="loc_bwp_RequiredAmountOfFundingOfPeriodicPensionCost_D5433CC6C8708C3E1DCBA54AFF1AFDEC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_B60BBEADF8FE9D25098BA54AFF1BC568_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_B60BBEADF8FE9D25098BA54AFF1BC568" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Contribution to defined benefit pension plan </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_B60BBEADF8FE9D25098BA54AFF1BC568_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_B60BBEADF8FE9D25098BA54AFF1BC568" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Plan Assets, Contributions by Employer </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_B60BBEADF8FE9D25098BA54AFF1BC568" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_3493A89F58270C79856DA54AFF1B667C_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_3493A89F58270C79856DA54AFF1B667C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_3493A89F58270C79856DA54AFF1B667C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_3493A89F58270C79856DA54AFF1B667C" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_3493A89F58270C79856DA54AFF1B667C" xlink:type="arc"/>
<link:label id="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90_terseLabel_en-US" xlink:label="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum amount of recognized expense each year associated with retirement plan </link:label>
<link:label id="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90_label_en-US" xlink:label="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum amount of recognized expense each year associated with retirement plan </link:label>
<link:label id="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90_documentation_en-US" xlink:label="lab_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of minimum pension benefit costs recognized during the period for defined benefit plans which is included in Texas Gas' rate structure as determined by the latest rate case. Pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan" xlink:label="loc_bwp_Minimumamountofrecognizedexpenseeachyearassociatedwithretirementplan_BEFF6C8E3834AD1F0068A54AFF1B5C90" xlink:type="locator"/>
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<link:label id="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0_label_en-US" xlink:label="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Precluded future recovery of annual pension costs, lower range </link:label>
<link:label id="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0_documentation_en-US" xlink:label="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount of annual pension costs precluded from future recoveries in future rate casts, at lower range. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange" xlink:label="loc_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0" xlink:to="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsLowerRange_764FD6F961130D950E2FA54AFF1B1DC0" xlink:type="arc"/>
<link:label id="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D_label_en-US" xlink:label="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Precluded future recovery of annual pension costs, upper range </link:label>
<link:label id="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D_documentation_en-US" xlink:label="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount of annual pension costs precluded from future recoveries in future rate casts, at upper range. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange" xlink:label="loc_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D" xlink:to="lab_bwp_PrecludedFutureRecoveryOfAnnualPensionCostsUpperRange_03E41737DAC71CF8DE90A54AFF1CD68D" xlink:type="arc"/>
<link:label id="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69_terseLabel_en-US" xlink:label="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Recognition of regulatory assets (in excess of) </link:label>
<link:label id="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69_label_en-US" xlink:label="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Recognition of regulatory assets </link:label>
<link:label id="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69_documentation_en-US" xlink:label="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Minimum threshold of annual pension plan costs that would allow the entity to recognize regulatory assets. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_RecognitionOfRegulatoryAssets" xlink:label="loc_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:to="lab_bwp_RecognitionOfRegulatoryAssets_BA0CD58FB9FBE4BEDCE2A54AFF1C6A69" xlink:type="arc"/>
<link:label id="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1_terseLabel_en-US" xlink:label="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reduction of regulatory assets (less than) </link:label>
<link:label id="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1_label_en-US" xlink:label="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reduction of regulatory assets </link:label>
<link:label id="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1_documentation_en-US" xlink:label="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum threshold of the amount of annual pension plan costs that would cause the entity to reduce regulatory assets. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ReductionOfRegulatoryAssets" xlink:label="loc_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:to="lab_bwp_ReductionOfRegulatoryAssets_7540B470A494E367E437A54AFF1C83C1" xlink:type="arc"/>
<link:label id="lab_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE_label_en-US" xlink:label="lab_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension plan costs charged to expense, lower range </link:label>
<link:label id="lab_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE_documentation_en-US" xlink:label="lab_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of pension benefit costs, at lower range, recognized during the period for defined benefit plans that has no impact on regulatory assets. Pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PensionPlanCostsChargedToExpenseLowerRange" xlink:label="loc_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE" xlink:to="lab_bwp_PensionPlanCostsChargedToExpenseLowerRange_8F116B3A9A3E655EB309A54AFF1C2AEE" xlink:type="arc"/>
<link:label id="lab_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE_label_en-US" xlink:label="lab_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension plan costs charged to expense, upper range </link:label>
<link:label id="lab_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE_documentation_en-US" xlink:label="lab_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of pension benefit costs, at upper range, recognized during the period for defined benefit plans that has no impact on regulatory assets. Pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PensionPlanCostsChargedToExpenseUpperRange" xlink:label="loc_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE" xlink:to="lab_bwp_PensionPlanCostsChargedToExpenseUpperRange_C0BCC83AC8C7B2807FD1A54AFF1CBEAE" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Defined Contribution Plan, Cost </link:label>
<link:label id="lab_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8_label_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Contribution Plan, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8" xlink:to="lab_us-gaap_DefinedContributionPlanCostRecognized_F8A887C2D57EF0467F19A54AFF1CF6A8" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BB8454A8A0117BEAF036A54AFF1D4EDB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BB8454A8A0117BEAF036A54AFF1D4EDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Allocated Share-based Compensation Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BB8454A8A0117BEAF036A54AFF1D4EDB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BB8454A8A0117BEAF036A54AFF1D4EDB" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BB8454A8A0117BEAF036A54AFF1D4EDB" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_5DEFDEDD14DE48D8F1F6A530DDC957D0_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_5DEFDEDD14DE48D8F1F6A530DDC957D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_5DEFDEDD14DE48D8F1F6A530DDC957D0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_5DEFDEDD14DE48D8F1F6A530DDC957D0" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_5DEFDEDD14DE48D8F1F6A530DDC957D0" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> OPERATING ACTIVITIES: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_B343739C48844568B8C0A530DDCAC3D8" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E2B83608CE2B0CB308B6A530DDCB1967_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E2B83608CE2B0CB308B6A530DDCB1967" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net income to cash provided by operations: </link:label>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E2B83608CE2B0CB308B6A530DDCB1967_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E2B83608CE2B0CB308B6A530DDCB1967" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E2B83608CE2B0CB308B6A530DDCB1967" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AmortizationOfDeferredCharges_8296C81495E2E03B40ADA530DDCBFC21_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDeferredCharges_8296C81495E2E03B40ADA530DDCBFC21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of deferred costs and other </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInGasImbalanceReceivable_AE779B099E40265EB970A530DDCCC5A8_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInGasImbalanceReceivable_AE779B099E40265EB970A530DDCCC5A8" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Gas receivables and storage assets </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties_EB01100DE6513BA28AF8A530DDCD2CE2_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableRelatedParties_EB01100DE6513BA28AF8A530DDCD2CE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other payables, affiliates </link:label>
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<link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_723D80B72A5A57B8C975A533F9DC8F9D_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_723D80B72A5A57B8C975A533F9DC8F9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advances to affiliates </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentTable_5E10F71C9C178CC5300DC469D57ED59E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_5E10F71C9C178CC5300DC469D57ED59E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table] </link:label>
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<link:label id="lab_us-gaap_LongtermDebtTypeAxis_33A51AD7F82B6DC79F23C469D57EE18C_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_33A51AD7F82B6DC79F23C469D57EE18C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>
<link:label id="lab_us-gaap_LongtermDebtTypeAxis_33A51AD7F82B6DC79F23C469D57EE18C_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_33A51AD7F82B6DC79F23C469D57EE18C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>
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<link:label id="lab_us-gaap_LongtermDebtTypeDomain_39D74FB7A6B109DDD830C469D57E05BA_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_39D74FB7A6B109DDD830C469D57E05BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Domain] </link:label>
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<link:label id="lab_us-gaap_UnsecuredDebtMember_774EFFA6C6E25EEBD685C469D57F9AB1_terseLabel_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_774EFFA6C6E25EEBD685C469D57F9AB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unsecured Debt </link:label>
<link:label id="lab_us-gaap_UnsecuredDebtMember_774EFFA6C6E25EEBD685C469D57F9AB1_label_en-US" xlink:label="lab_us-gaap_UnsecuredDebtMember_774EFFA6C6E25EEBD685C469D57F9AB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unsecured Debt [Member] </link:label>
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<link:label id="lab_us-gaap_LineOfCreditMember_B2E3770C85C367F59B7AC469D57F1CFC_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_B2E3770C85C367F59B7AC469D57F1CFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit </link:label>
<link:label id="lab_us-gaap_LineOfCreditMember_B2E3770C85C367F59B7AC469D57F1CFC_label_en-US" xlink:label="lab_us-gaap_LineOfCreditMember_B2E3770C85C367F59B7AC469D57F1CFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit [Member] </link:label>
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<link:label id="lab_us-gaap_CapitalLeaseObligationsMember_6B9E7BF40072991FE85BC469D57F8CB1_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsMember_6B9E7BF40072991FE85BC469D57F8CB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations </link:label>
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<link:label id="lab_us-gaap_SubordinatedDebtMember_7ACB861A5DD5BC23942EC469D57F346E_terseLabel_en-US" xlink:label="lab_us-gaap_SubordinatedDebtMember_7ACB861A5DD5BC23942EC469D57F346E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subordinated Debt </link:label>
<link:label id="lab_us-gaap_SubordinatedDebtMember_7ACB861A5DD5BC23942EC469D57F346E_label_en-US" xlink:label="lab_us-gaap_SubordinatedDebtMember_7ACB861A5DD5BC23942EC469D57F346E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subordinated Debt [Member] </link:label>
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<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 5.75% Notes Due 2019 </link:label>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F_label_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines Notes Due 2019 [Member] </link:label>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F_documentation_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information on Boardwalk notes due 2019. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BoardwalkPipelinesNotesDue2019Member" xlink:label="loc_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:to="lab_bwp_BoardwalkPipelinesNotesDue2019Member_89C9F8C4C19AAA9EF43AC469D580B69F" xlink:type="arc"/>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 3.375% Notes Due 2023 </link:label>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8_label_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines Notes Due 2023 [Member] </link:label>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8_documentation_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information on Boardwalk Pipelines notes due 2023. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BoardwalkPipelinesNotesDue2023Member" xlink:label="loc_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:to="lab_bwp_BoardwalkPipelinesNotesDue2023Member_6F4862055F04E4FCB420C469D5806BE8" xlink:type="arc"/>
<link:label id="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.95% Notes Due 2024 </link:label>
<link:label id="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177_label_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.95% Notes Due 2024 [Member] </link:label>
<link:label id="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177_documentation_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.95% Notes Due 2024 </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BoardwalkPipelines4.95NotesDue2024Member" xlink:label="loc_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:to="lab_bwp_BoardwalkPipelines4.95NotesDue2024Member_63C54BE87D60F4A24C74C469D5801177" xlink:type="arc"/>
<link:label id="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 5.95% Notes Due 2026 </link:label>
<link:label id="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A_label_en-US" xlink:label="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 5.95% Notes Due 2026 [Member] </link:label>
<link:label id="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A_documentation_en-US" xlink:label="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 5.95% Notes Due 2026 </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BoardwalkPipelines5.95NotesDue2026Member" xlink:label="loc_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:to="lab_bwp_BoardwalkPipelines5.95NotesDue2026Member_339ED69CEEE37556620BC469D5811C4A" xlink:type="arc"/>
<link:label id="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.45% Notes Due 2027 </link:label>
<link:label id="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7_label_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.45% Notes Due 2027 [Member] </link:label>
<link:label id="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7_documentation_en-US" xlink:label="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 4.45% Notes Due 2027 </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BoardwalkPipelines4.45NotesDue2027Member" xlink:label="loc_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:to="lab_bwp_BoardwalkPipelines4.45NotesDue2027Member_CA21906EEB4C98126666C469D581AEB7" xlink:type="arc"/>
<link:label id="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B_terseLabel_en-US" xlink:label="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gulf South 4.00% Notes Due 2022 </link:label>
<link:label id="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B_label_en-US" xlink:label="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gulf South Notes Due 2022 [Member] </link:label>
<link:label id="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B_documentation_en-US" xlink:label="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Gulf South Notes Due 2022 [Member] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GulfSouthNotesDue2022Member" xlink:label="loc_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:to="lab_bwp_GulfSouthNotesDue2022Member_8AD4EE1E052A167653B5C469D581191B" xlink:type="arc"/>
<link:label id="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16_terseLabel_en-US" xlink:label="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Texas Gas 4.50% Notes Due 2021 </link:label>
<link:label id="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16_label_en-US" xlink:label="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Texas Gas Notes Due 2021 [Member] </link:label>
<link:label id="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16_documentation_en-US" xlink:label="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information on Texas Gas notes due 2021. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TexasGasNotesDue2021Member" xlink:label="loc_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:to="lab_bwp_TexasGasNotesDue2021Member_084D574BA7CFD32B9528C469D5810D16" xlink:type="arc"/>
<link:label id="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68_terseLabel_en-US" xlink:label="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Texas Gas 7.25% Debentures Due 2027 </link:label>
<link:label id="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68_label_en-US" xlink:label="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Texas Gas Debentures Due 2027 [Member] </link:label>
<link:label id="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68_documentation_en-US" xlink:label="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information on Texas Gas debentures due 2025. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TexasGasDebenturesDue2027Member" xlink:label="loc_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:to="lab_bwp_TexasGasDebenturesDue2027Member_3BD597C22158A5F44985C469D581EB68" xlink:type="arc"/>
<link:label id="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D_terseLabel_en-US" xlink:label="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total Notes and Debentures </link:label>
<link:label id="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D_label_en-US" xlink:label="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Total Notes and Debentures [Member] </link:label>
<link:label id="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D_documentation_en-US" xlink:label="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Total notes and debentures at period end. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TotalNotesandDebenturesMember" xlink:label="loc_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:to="lab_bwp_TotalNotesandDebenturesMember_7F6B005086097C4449B3C469D582FE2D" xlink:type="arc"/>
<link:label id="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247_terseLabel_en-US" xlink:label="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gulf Crossing Revolving Credit Facility </link:label>
<link:label id="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247_label_en-US" xlink:label="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gulf Crossing Revolving Credit Facility [Member] </link:label>
<link:label id="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247_documentation_en-US" xlink:label="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Gulf Crossing Revolving Credit Facility [Member] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GulfCrossingRevolvingCreditFacilityMember" xlink:label="loc_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:to="lab_bwp_GulfCrossingRevolvingCreditFacilityMember_B14FBFFAAF9487DE88C7C469D5824247" xlink:type="arc"/>
<link:label id="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655_terseLabel_en-US" xlink:label="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gulf South Revolving Credit Facility </link:label>
<link:label id="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655_label_en-US" xlink:label="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gulf South Revolving Credit Facility [Member] </link:label>
<link:label id="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655_documentation_en-US" xlink:label="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Gulf South Revolving Credit Facility [Member] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GulfSouthRevolvingCreditFacilityMember" xlink:label="loc_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:to="lab_bwp_GulfSouthRevolvingCreditFacilityMember_CE655A0D6BE29E84264EC469D5821655" xlink:type="arc"/>
<link:label id="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C_terseLabel_en-US" xlink:label="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gulf South 6.30% Notes Due 2017 </link:label>
<link:label id="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C_label_en-US" xlink:label="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gulf South 6.30% Notes Due 2017 [Member] </link:label>
<link:label id="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C_documentation_en-US" xlink:label="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information on Gulf South 6.30% Notes Due 2017. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GulfSouth6.30NotesDue2017Member" xlink:label="loc_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:to="lab_bwp_GulfSouth6.30NotesDue2017Member_9A00DD458A34AFE9B9F5C469D5826A7C" xlink:type="arc"/>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2016Member_A4303E9C2FEC655919A2C469D582A5A0_terseLabel_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2016Member_A4303E9C2FEC655919A2C469D582A5A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines 5.875% Notes Due 2016 </link:label>
<link:label id="lab_bwp_BoardwalkPipelinesNotesDue2016Member_A4303E9C2FEC655919A2C469D582A5A0_label_en-US" xlink:label="lab_bwp_BoardwalkPipelinesNotesDue2016Member_A4303E9C2FEC655919A2C469D582A5A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Boardwalk Pipelines Notes Due 2016 [Member] </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_FCE8243A8D004FD1A8C8C469D587D86E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_FCE8243A8D004FD1A8C8C469D587D86E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Unamortized Discount </link:label>
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<link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_F08B0CA214E13DB23DF6C469D5884AE2_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_F08B0CA214E13DB23DF6C469D5884AE2" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized debt issuance costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_F08B0CA214E13DB23DF6C469D5884AE2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LongTermDebtByMaturityAbstract_61B32DE313029540D2F2C469D588F84C_label_en-US" xlink:label="lab_us-gaap_LongTermDebtByMaturityAbstract_61B32DE313029540D2F2C469D588F84C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Fiscal Year Maturity [Abstract] </link:label>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_B97431F1BF6C80F8B19EC469D588243A_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_B97431F1BF6C80F8B19EC469D588243A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_B97431F1BF6C80F8B19EC469D588243A_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_B97431F1BF6C80F8B19EC469D588243A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_B97431F1BF6C80F8B19EC469D588243A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_C8D9FE2ABF92D6E4BADFC469D588148B_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_C8D9FE2ABF92D6E4BADFC469D588148B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_C8D9FE2ABF92D6E4BADFC469D588148B_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_C8D9FE2ABF92D6E4BADFC469D588148B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Maturities, Repayments of Principal in Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_C8D9FE2ABF92D6E4BADFC469D588148B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_BFA83EFEFAF3569559D8C469D589304C_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_BFA83EFEFAF3569559D8C469D589304C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_BFA83EFEFAF3569559D8C469D589304C_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_BFA83EFEFAF3569559D8C469D589304C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Maturities, Repayments of Principal in Year Three </link:label>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_F1C42ABDB76F8A52A3CFC469D5895665_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_F1C42ABDB76F8A52A3CFC469D5895665" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_EC0EFE1AE108A55BE719C469D5899AAA_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_EC0EFE1AE108A55BE719C469D5899AAA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
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<link:label id="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_8123BD01977C197CE7F1C469D5892F2C_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_8123BD01977C197CE7F1C469D5892F2C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_5EB253AE12FCE22DCAC8C469D589D21B_totalLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_5EB253AE12FCE22DCAC8C469D589D21B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total long-term debt </link:label>
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<link:label id="lab_us-gaap_ShortTermDebtRefinancedAmount_10DE834FBBCD35A2C217C469D58A8572_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermDebtRefinancedAmount_10DE834FBBCD35A2C217C469D58A8572" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Short-term Debt, Refinanced, Amount </link:label>
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<link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_FAC217F87D0691AFAA99C469D58ABBEC_terseLabel_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_FAC217F87D0691AFAA99C469D58ABBEC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt, Weighted-Average Interest Rate </link:label>
<link:label id="lab_us-gaap_DebtWeightedAverageInterestRate_FAC217F87D0691AFAA99C469D58ABBEC_label_en-US" xlink:label="lab_us-gaap_DebtWeightedAverageInterestRate_FAC217F87D0691AFAA99C469D58ABBEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt, Weighted Average Interest Rate </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentIssuanceDate1_352226851DC29230D441C469D58A50D7_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentIssuanceDate1_352226851DC29230D441C469D58A50D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Issuance Date </link:label>
<link:label id="lab_us-gaap_DebtInstrumentIssuanceDate1_352226851DC29230D441C469D58A50D7_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentIssuanceDate1_352226851DC29230D441C469D58A50D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Issuance Date </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentIssuanceDate1" xlink:label="loc_us-gaap_DebtInstrumentIssuanceDate1_352226851DC29230D441C469D58A50D7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_5D476131D35F4E1518C4C469D58AF61E_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_5D476131D35F4E1518C4C469D58AF61E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Face Amount </link:label>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_5D476131D35F4E1518C4C469D58AF61E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_5D476131D35F4E1518C4C469D58AF61E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Face Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_5D476131D35F4E1518C4C469D58AF61E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_6FD82A2647A1B19D5175C469D58ADB54_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_6FD82A2647A1B19D5175C469D58ADB54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payments of Debt Issuance Costs </link:label>
<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_6FD82A2647A1B19D5175C469D58ADB54_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_6FD82A2647A1B19D5175C469D58ADB54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Debt Issuance Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_6FD82A2647A1B19D5175C469D58ADB54" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_CD4409203AD3C340B58AC469D58B6FD8_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_CD4409203AD3C340B58AC469D58B6FD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from Debt, Net of Issuance Costs </link:label>
<link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_CD4409203AD3C340B58AC469D58B6FD8_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_CD4409203AD3C340B58AC469D58B6FD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Debt, Net of Issuance Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_CD4409203AD3C340B58AC469D58B6FD8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_362E87857A38A8F6D49FC469D58B6DD6_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_362E87857A38A8F6D49FC469D58B6DD6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Stated Percentage </link:label>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_362E87857A38A8F6D49FC469D58B6DD6_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_362E87857A38A8F6D49FC469D58B6DD6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Stated Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_362E87857A38A8F6D49FC469D58B6DD6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentMaturityDate_2A7A3D0D4B86DD25BDCDC469D58B52C0_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_2A7A3D0D4B86DD25BDCDC469D58B52C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Maturity Date </link:label>
<link:label id="lab_us-gaap_DebtInstrumentMaturityDate_2A7A3D0D4B86DD25BDCDC469D58B52C0_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentMaturityDate_2A7A3D0D4B86DD25BDCDC469D58B52C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Maturity Date </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_2A7A3D0D4B86DD25BDCDC469D58B52C0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RepaymentsOfUnsecuredDebt_5478200C0FEBFD35D587C469D58B0DDC_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfUnsecuredDebt_5478200C0FEBFD35D587C469D58B0DDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Repayments of Unsecured Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfUnsecuredDebt" xlink:label="loc_us-gaap_RepaymentsOfUnsecuredDebt_5478200C0FEBFD35D587C469D58B0DDC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_8CDAE688A1C10C28551AC469D58B18A6_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_8CDAE688A1C10C28551AC469D58B18A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption Price, Percentage - equal to the greater of </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_8CDAE688A1C10C28551AC469D58B18A6_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_8CDAE688A1C10C28551AC469D58B18A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption Price, Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_8CDAE688A1C10C28551AC469D58B18A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentRedemptionDescription_45357D3B998A83B5A06FC469D58CC1DB_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionDescription_45357D3B998A83B5A06FC469D58CC1DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Description </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionDescription_45357D3B998A83B5A06FC469D58CC1DB_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionDescription_45357D3B998A83B5A06FC469D58CC1DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Description </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentRedemptionDescription" xlink:label="loc_us-gaap_DebtInstrumentRedemptionDescription_45357D3B998A83B5A06FC469D58CC1DB" xlink:type="locator"/>
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<link:label id="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C_terseLabel_en-US" xlink:label="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subordinated Loan Agreement Maximum Borrowing Capacity </link:label>
<link:label id="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C_label_en-US" xlink:label="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subordinated Loan Agreement Maximum Borrowing Capacity </link:label>
<link:label id="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C_documentation_en-US" xlink:label="lab_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum borrowing capacity under the Subordinated Loan Agreement without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the agreement. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity" xlink:label="loc_bwp_SubordinatedLoanAgreementMaximumBorrowingCapacity_A9774C700F9A5B2ED940C469D58CAE4C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentCovenantDescription_A077179B70A1DC079B57C469D58C69CD_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCovenantDescription_A077179B70A1DC079B57C469D58C69CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant Description </link:label>
<link:label id="lab_us-gaap_DebtInstrumentCovenantDescription_A077179B70A1DC079B57C469D58C69CD_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCovenantDescription_A077179B70A1DC079B57C469D58C69CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant Description </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCovenantDescription" xlink:label="loc_us-gaap_DebtInstrumentCovenantDescription_A077179B70A1DC079B57C469D58C69CD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentCovenantCompliance_C94E7D10AAE1141D4756C469D58C03D9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCovenantCompliance_C94E7D10AAE1141D4756C469D58C03D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Covenant Compliance </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCovenantCompliance" xlink:label="loc_us-gaap_DebtInstrumentCovenantCompliance_C94E7D10AAE1141D4756C469D58C03D9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubordinatedBorrowingTermsAndConditions_71E01640D7F367C15AB5C469D58CBE71_terseLabel_en-US" xlink:label="lab_us-gaap_SubordinatedBorrowingTermsAndConditions_71E01640D7F367C15AB5C469D58CBE71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subordinated Borrowing Terms and Conditions </link:label>
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<link:label id="lab_us-gaap_SubordinatedDebt_63354241091F6E7E8B57C469D58C28BC_terseLabel_en-US" xlink:label="lab_us-gaap_SubordinatedDebt_63354241091F6E7E8B57C469D58C28BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subordinated Debt </link:label>
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<link:label id="lab_us-gaap_LineOfCreditFacilityAbstract_E446FBCFCFE51F0CA8ABC469D58DED38_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAbstract_E446FBCFCFE51F0CA8ABC469D58DED38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Abstract] </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_E282B0DE25AF7FB9CC44C469D58D5DB9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_E282B0DE25AF7FB9CC44C469D58D5DB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Description of Variable Rate Basis </link:label>
<link:label id="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_E282B0DE25AF7FB9CC44C469D58D5DB9_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_E282B0DE25AF7FB9CC44C469D58D5DB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Description of Variable Rate Basis </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_E282B0DE25AF7FB9CC44C469D58D5DB9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0EF49BEC3BC228E5E857C469D58DCBDA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0EF49BEC3BC228E5E857C469D58DCBDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0EF49BEC3BC228E5E857C469D58DCBDA_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0EF49BEC3BC228E5E857C469D58DCBDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0EF49BEC3BC228E5E857C469D58DCBDA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_00B9F14047F6E99068C2C469D58E30FA_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_00B9F14047F6E99068C2C469D58E30FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Commitment Fee Percentage </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_00B9F14047F6E99068C2C469D58E30FA_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_00B9F14047F6E99068C2C469D58E30FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Commitment Fee Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_00B9F14047F6E99068C2C469D58E30FA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_84EA152D48CBCFB12A4BC469D58DBF44_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_84EA152D48CBCFB12A4BC469D58DBF44" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_84EA152D48CBCFB12A4BC469D58DBF44" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityExpirationDate1_732996B2863DC795D7CCC469D58E53B5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationDate1_732996B2863DC795D7CCC469D58E53B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Expiration Date </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityExpirationDate1_732996B2863DC795D7CCC469D58E53B5_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityExpirationDate1_732996B2863DC795D7CCC469D58E53B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Expiration Date </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_732996B2863DC795D7CCC469D58E53B5" xlink:type="locator"/>
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<link:label id="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937_terseLabel_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum Ratio of Debt to EBITDA </link:label>
<link:label id="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937_label_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum Ratio of Debt to EBITDA </link:label>
<link:label id="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937_documentation_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum Ratio of Debt to EBITDA permitted under covenants for the previous twelve months. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MaximumRatioofDebttoEBITDA" xlink:label="loc_bwp_MaximumRatioofDebttoEBITDA_FC384BC0FBEB49D79081C469D58EF937" xlink:type="locator"/>
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<link:label id="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C_terseLabel_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum Ratio of Debt to EBITDA after Acquisition </link:label>
<link:label id="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C_label_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum Ratio of Debt to EBITDA after Acquisition </link:label>
<link:label id="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C_documentation_en-US" xlink:label="lab_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum ratio of debt to EBITDA permitted under the covenants for the three quarters following an acquisition. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MaximumRatioofDebttoEBITDAafterAcquisition" xlink:label="loc_bwp_MaximumRatioofDebttoEBITDAafterAcquisition_62205457C11DF7D35473C469D58EEA5C" xlink:type="locator"/>
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<link:label id="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22_terseLabel_en-US" xlink:label="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Qualified Acquisition Purchase Price Target (greater than) </link:label>
<link:label id="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22_label_en-US" xlink:label="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Qualified Acquisition Purchase Price Target </link:label>
<link:label id="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22_documentation_en-US" xlink:label="lab_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount the purchase price of a qualified acquisition or series of acquisitions must exceed over a rolling 12-month period within the revolving credit facility covenant of total consolidated debt to consolidated EBITDA. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_QualifiedAcquisitionPurchasePriceTarget" xlink:label="loc_bwp_QualifiedAcquisitionPurchasePriceTarget_8D3C820CD7C6678C2AC8C469D58EDF22" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCredit_42FF0268CEECD64FC381C469D58F5E3C_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_42FF0268CEECD64FC381C469D58F5E3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Line of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_42FF0268CEECD64FC381C469D58F5E3C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7842F965AFCF956B0F01C469D58FE56C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7842F965AFCF956B0F01C469D58FE56C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Remaining Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_7842F965AFCF956B0F01C469D58FE56C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityCovenantTerms_B6C8DFEF72D875D0A337C469D58FFF25_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCovenantTerms_B6C8DFEF72D875D0A337C469D58FFF25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Covenant Terms </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCovenantTerms" xlink:label="loc_us-gaap_LineOfCreditFacilityCovenantTerms_B6C8DFEF72D875D0A337C469D58FFF25" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityCovenantCompliance_2E35FFF8E3B0C382BA0EC469D58F9EEC_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCovenantCompliance_2E35FFF8E3B0C382BA0EC469D58F9EEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Covenant Compliance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCovenantCompliance" xlink:label="loc_us-gaap_LineOfCreditFacilityCovenantCompliance_2E35FFF8E3B0C382BA0EC469D58F9EEC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_29F3E4DBD0438571DA339FF69B46ABF5_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_29F3E4DBD0438571DA339FF69B46ABF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments </link:label>
<link:label id="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_29F3E4DBD0438571DA339FF69B46ABF5_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_29F3E4DBD0438571DA339FF69B46ABF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_29F3E4DBD0438571DA339FF69B46ABF5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_BBB707D8F157403D84609FF69B460A19_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_BBB707D8F157403D84609FF69B460A19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Maturities of Long-term Debt </link:label>
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<link:label id="lab_bwp_CapitalLeasedAssetsAbstract_D82596CCF5EBCD0F5CB9C469D30174FC_label_en-US" xlink:label="lab_bwp_CapitalLeasedAssetsAbstract_D82596CCF5EBCD0F5CB9C469D30174FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leased Assets [Abstract] </link:label>
<link:label id="lab_bwp_CapitalLeasedAssetsAbstract_D82596CCF5EBCD0F5CB9C469D30174FC_documentation_en-US" xlink:label="lab_bwp_CapitalLeasedAssetsAbstract_D82596CCF5EBCD0F5CB9C469D30174FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Capital Leased Assets [Abstract] </link:label>
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<link:label id="lab_srt_OfficeBuildingMember_6CD58D332C79C799CB4AC469D301ACFB_label_en-US" xlink:label="lab_srt_OfficeBuildingMember_6CD58D332C79C799CB4AC469D301ACFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Office Building [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_OfficeBuildingMember" xlink:label="loc_srt_OfficeBuildingMember_6CD58D332C79C799CB4AC469D301ACFB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CapitalLeasedAssetsLineItems_992697C4EE8B3B960916C469D3010BA6_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasedAssetsLineItems_992697C4EE8B3B960916C469D3010BA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital Leased Assets [Line Items] </link:label>
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<link:label id="lab_us-gaap_CapitalLeaseObligationsIncurred_9983164142C03FED05E3C469D301B369_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsIncurred_9983164142C03FED05E3C469D301B369" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations Incurred </link:label>
<link:label id="lab_us-gaap_CapitalLeaseObligationsIncurred_9983164142C03FED05E3C469D301B369_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsIncurred_9983164142C03FED05E3C469D301B369" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations Incurred </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeaseObligationsIncurred" xlink:label="loc_us-gaap_CapitalLeaseObligationsIncurred_9983164142C03FED05E3C469D301B369" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases_C02EC3C931ABF3B1B43EC469D301F1BB_terseLabel_en-US" xlink:label="lab_us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases_C02EC3C931ABF3B1B43EC469D301F1BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Description of Lessee Leasing Arrangements, Capital Leases </link:label>
<link:label id="lab_us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases_C02EC3C931ABF3B1B43EC469D301F1BB_label_en-US" xlink:label="lab_us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases_C02EC3C931ABF3B1B43EC469D301F1BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Description of Lessee Leasing Arrangements, Capital Leases </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases" xlink:label="loc_us-gaap_DescriptionOfLesseeLeasingArrangementsCapitalLeases_C02EC3C931ABF3B1B43EC469D301F1BB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2602CE763BF4F58FFB07C469D3018780_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2602CE763BF4F58FFB07C469D3018780" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2602CE763BF4F58FFB07C469D3018780_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2602CE763BF4F58FFB07C469D3018780" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due, Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_2602CE763BF4F58FFB07C469D3018780" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A9D8C1BC6AF730AD8AACC469D301691E_verboseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A9D8C1BC6AF730AD8AACC469D301691E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A9D8C1BC6AF730AD8AACC469D301691E_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_A9D8C1BC6AF730AD8AACC469D301691E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Two Years </link:label>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_EB1E97ED7D10922D3A0CC469D301BC32_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_EB1E97ED7D10922D3A0CC469D301BC32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_EB1E97ED7D10922D3A0CC469D301BC32_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_EB1E97ED7D10922D3A0CC469D301BC32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Three Years </link:label>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_CA5A1D6C812C15CE7E2FC469D30192B7_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_CA5A1D6C812C15CE7E2FC469D30192B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_CA5A1D6C812C15CE7E2FC469D30192B7_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_CA5A1D6C812C15CE7E2FC469D30192B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Four Years </link:label>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FE8E0DA919ECF6D88066C469D301F34E_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FE8E0DA919ECF6D88066C469D301F34E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FE8E0DA919ECF6D88066C469D301F34E_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_FE8E0DA919ECF6D88066C469D301F34E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Five Years </link:label>
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<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_80B8C75EA4D36C386758C469D3014204_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_80B8C75EA4D36C386758C469D3014204" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
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<link:label id="lab_us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease_A596EA26298D0F504840C469D30198F3_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease_A596EA26298D0F504840C469D30198F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Less amounts representing interest </link:label>
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<link:label id="lab_us-gaap_CapitalLeaseObligationsCurrent_ADCF1943DBE8AAAB962CC469D3016314_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsCurrent_ADCF1943DBE8AAAB962CC469D3016314" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current portion of obligations under capital lease (recorded in Other current liabilities) </link:label>
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<link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_DE9A18E905EE0574E5E7DD2C878767AC_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_DE9A18E905EE0574E5E7DD2C878767AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Principles of Consolidation </link:label>
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<link:label id="lab_us-gaap_UseOfEstimates_005E79DEEF77CC1E9437DD2C8788AC5B_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_005E79DEEF77CC1E9437DD2C8788AC5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of Estimates </link:label>
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<link:label id="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_CBB90BCAF7F30CFB5F82DD2C87886500_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingPolicyPolicyTextBlock_CBB90BCAF7F30CFB5F82DD2C87886500" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segment Information </link:label>
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<link:label id="lab_us-gaap_PublicUtilitiesPolicyTextBlock_A53E7845DF6A59481266DD2C87883855_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPolicyTextBlock_A53E7845DF6A59481266DD2C87883855" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Accounting </link:label>
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<link:label id="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_47E6A4CC826D6F45245ADD2C8788F8C3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueOfFinancialInstrumentsPolicy_47E6A4CC826D6F45245ADD2C8788F8C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Measurements </link:label>
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<link:label id="lab_us-gaap_GasBalancingArrangementsPolicy_944B23A07977AAC056B0DD2C8789E0F3_verboseLabel_en-US" xlink:label="lab_us-gaap_GasBalancingArrangementsPolicy_944B23A07977AAC056B0DD2C8789E0F3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Gas Stored Underground and Gas Receivables and Payables </link:label>
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<link:label id="lab_bwp_MaterialsAndSuppliesPolicyTextBlock_0920600A712DDB1FE189DD2C8789BFEE_verboseLabel_en-US" xlink:label="lab_bwp_MaterialsAndSuppliesPolicyTextBlock_0920600A712DDB1FE189DD2C8789BFEE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Materials and Supplies </link:label>
<link:label id="lab_bwp_MaterialsAndSuppliesPolicyTextBlock_0920600A712DDB1FE189DD2C8789BFEE_label_en-US" xlink:label="lab_bwp_MaterialsAndSuppliesPolicyTextBlock_0920600A712DDB1FE189DD2C8789BFEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Materials and Supplies [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_C769E8E0ADC77DC13ACFDD2C878942A9_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_C769E8E0ADC77DC13ACFDD2C878942A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment and Repair and Maintenance Costs </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_C769E8E0ADC77DC13ACFDD2C878942A9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_C769E8E0ADC77DC13ACFDD2C878942A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_72FDA6F81AAE9BA36E0BDD2C87895BC5_verboseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_72FDA6F81AAE9BA36E0BDD2C87895BC5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets </link:label>
<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_72FDA6F81AAE9BA36E0BDD2C87895BC5_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_72FDA6F81AAE9BA36E0BDD2C87895BC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_72FDA6F81AAE9BA36E0BDD2C87895BC5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_CCE7C37C033E5376C98EDD2C8789C784_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_CCE7C37C033E5376C98EDD2C8789C784" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Impairment of Long-Lived Assets (including Tangible and Definite-lived Intangible Assets) </link:label>
<link:label id="lab_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_CCE7C37C033E5376C98EDD2C8789C784_label_en-US" xlink:label="lab_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_CCE7C37C033E5376C98EDD2C8789C784" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock" xlink:label="loc_us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_CCE7C37C033E5376C98EDD2C8789C784" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestExpensePolicyTextBlock_CF269A55780946EA9A29DD2C878AA88B_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpensePolicyTextBlock_CF269A55780946EA9A29DD2C878AA88B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capitalized Interest and Allowance for Funds Used During Construction (AFUDC) </link:label>
<link:label id="lab_us-gaap_InterestExpensePolicyTextBlock_CF269A55780946EA9A29DD2C878AA88B_label_en-US" xlink:label="lab_us-gaap_InterestExpensePolicyTextBlock_CF269A55780946EA9A29DD2C878AA88B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_585235ED65C2EE044B4ADD2C878A50B7_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_585235ED65C2EE044B4ADD2C878A50B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_585235ED65C2EE044B4ADD2C878A50B7_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_585235ED65C2EE044B4ADD2C878A50B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_585235ED65C2EE044B4ADD2C878A50B7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetRetirementObligationsPolicy_D89AD4D911595AA731FFDD2C878A9AE6_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsPolicy_D89AD4D911595AA731FFDD2C878A9AE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligations </link:label>
<link:label id="lab_us-gaap_AssetRetirementObligationsPolicy_D89AD4D911595AA731FFDD2C878A9AE6_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsPolicy_D89AD4D911595AA731FFDD2C878A9AE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationsPolicy" xlink:label="loc_us-gaap_AssetRetirementObligationsPolicy_D89AD4D911595AA731FFDD2C878A9AE6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EnvironmentalCostsPolicy_C126B5B225E56E12B064DD2C878A8F0F_terseLabel_en-US" xlink:label="lab_us-gaap_EnvironmentalCostsPolicy_C126B5B225E56E12B064DD2C878A8F0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Environmental Liabilities </link:label>
<link:label id="lab_us-gaap_EnvironmentalCostsPolicy_C126B5B225E56E12B064DD2C878A8F0F_label_en-US" xlink:label="lab_us-gaap_EnvironmentalCostsPolicy_C126B5B225E56E12B064DD2C878A8F0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Environmental Costs, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_A5D522AC01E404670967DD2C878ADF1A_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_A5D522AC01E404670967DD2C878ADF1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plans </link:label>
<link:label id="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_A5D522AC01E404670967DD2C878ADF1A_label_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_A5D522AC01E404670967DD2C878ADF1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension and Other Postretirement Plans, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_9BF49C546BB685FFCCC5DD2C878A44F0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_9BF49C546BB685FFCCC5DD2C878A44F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-Term Compensation </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_9BF49C546BB685FFCCC5DD2C878A44F0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_9BF49C546BB685FFCCC5DD2C878A44F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_StockholdersEquityPolicyTextBlock_E7EEC4E043C8AECE14BADD2C878A2995_verboseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityPolicyTextBlock_E7EEC4E043C8AECE14BADD2C878A2995" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Partner Capital Accounts </link:label>
<link:label id="lab_us-gaap_StockholdersEquityPolicyTextBlock_E7EEC4E043C8AECE14BADD2C878A2995_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityPolicyTextBlock_E7EEC4E043C8AECE14BADD2C878A2995" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock_4505ED437BE8BBBF39C6A4DBE9599CAC_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock_4505ED437BE8BBBF39C6A4DBE9599CAC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Assets and Liabilities </link:label>
<link:label id="lab_us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock_4505ED437BE8BBBF39C6A4DBE9599CAC_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRegulatoryAssetsAndLiabilitiesTextBlock_4505ED437BE8BBBF39C6A4DBE9599CAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Regulatory Assets and Liabilities [Text Block] </link:label>
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<link:label id="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_70ED693EABC3B69ADEFE8728ACC86104_verboseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedBalanceSheetTableTextBlock_499BC187A13054F9B59CDDB3670D214F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Condensed Consolidated Balance Sheets </link:label>
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<link:label id="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_6E2F304FC0C464DF180E8728ACC8EAF4_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_86C40548F10D544293DAE3692B044E21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Condensed Consolidating Statements of Income </link:label>
<link:label id="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_6E2F304FC0C464DF180E8728ACC8EAF4_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_86C40548F10D544293DAE3692B044E21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Condensed Income Statement [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedIncomeStatementTableTextBlock_86C40548F10D544293DAE3692B044E21" xlink:type="locator"/>
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<link:label id="lab_srt_CondensedStatementOfComprehensiveIncomeTableTextBlock_890046D634C2B9FD80C18728ACC8ABCD_terseLabel_en-US" xlink:label="lab_srt_CondensedStatementOfComprehensiveIncomeTableTextBlock_F277BA205DA65C34A2EA67B0837C5E62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Condensed Consolidating Statements of Comprehensive Income </link:label>
<link:label id="lab_srt_CondensedStatementOfComprehensiveIncomeTableTextBlock_890046D634C2B9FD80C18728ACC8ABCD_label_en-US" xlink:label="lab_srt_CondensedStatementOfComprehensiveIncomeTableTextBlock_F277BA205DA65C34A2EA67B0837C5E62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Condensed Statement of Comprehensive Income [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_CondensedStatementOfComprehensiveIncomeTableTextBlock" xlink:label="loc_srt_CondensedStatementOfComprehensiveIncomeTableTextBlock_F277BA205DA65C34A2EA67B0837C5E62" xlink:type="locator"/>
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<link:label id="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C80F4E265D2F7D4C8E378728ACC8B9AE_verboseLabel_en-US" xlink:label="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C4840EDD6D735EC2ACE9F3CC5E9C673D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Condensed Consolidating Statements of Cash Flows </link:label>
<link:label id="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C80F4E265D2F7D4C8E378728ACC8B9AE_label_en-US" xlink:label="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C4840EDD6D735EC2ACE9F3CC5E9C673D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Condensed Cash Flow Statement [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfCondensedCashFlowStatementTableTextBlock" xlink:label="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C4840EDD6D735EC2ACE9F3CC5E9C673D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C4840EDD6D735EC2ACE9F3CC5E9C673D" xlink:to="lab_srt_ScheduleOfCondensedCashFlowStatementTableTextBlock_C4840EDD6D735EC2ACE9F3CC5E9C673D" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D65D9703576E71939492A5F5B644951E_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_255FEE1F87925DD58499C4BC88BC09D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Operating Leased Assets [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_D65D9703576E71939492A5F5B644951E_label_en-US" xlink:label="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_255FEE1F87925DD58499C4BC88BC09D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Operating Leased Assets [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_255FEE1F87925DD58499C4BC88BC09D7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_255FEE1F87925DD58499C4BC88BC09D7" xlink:to="lab_us-gaap_ScheduleOfOperatingLeasedAssetsTable_255FEE1F87925DD58499C4BC88BC09D7" xlink:type="arc"/>
<link:label id="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_2C7456914B7993E7D0B1A5F5B645A4CB_terseLabel_en-US" xlink:label="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Office Space and Equipment Rentals </link:label>
<link:label id="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_2C7456914B7993E7D0B1A5F5B645A4CB_label_en-US" xlink:label="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Office Space and Equipment Rentals [Member] </link:label>
<link:label id="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_2C7456914B7993E7D0B1A5F5B645A4CB_documentation_en-US" xlink:label="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Office space and equipment rentals held by a lessee under operating leases. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OfficeSpaceAndEquipmentRentalsMember" xlink:label="loc_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:to="lab_bwp_OfficeSpaceAndEquipmentRentalsMember_C69ABBAD84165514A24CC83E01417714" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_80DF5FFFEFA77ADD8E88A5F5B64570BC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_25F9F2886EA45950A440A94618DD30ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Leased Assets [Line Items] </link:label>
<link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_80DF5FFFEFA77ADD8E88A5F5B64570BC_label_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_25F9F2886EA45950A440A94618DD30ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leased Assets [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_25F9F2886EA45950A440A94618DD30ED" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_25F9F2886EA45950A440A94618DD30ED" xlink:to="lab_us-gaap_OperatingLeasedAssetsLineItems_25F9F2886EA45950A440A94618DD30ED" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseAndRentalExpense_A557AFBE66C0A866D1F4A5F5B645652D_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_07A91D937B835677B756E21A06750276" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Rent Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="loc_us-gaap_LeaseAndRentalExpense_07A91D937B835677B756E21A06750276" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseAndRentalExpense_07A91D937B835677B756E21A06750276" xlink:to="lab_us-gaap_LeaseAndRentalExpense_07A91D937B835677B756E21A06750276" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_125AB2D692D67ECCD1CFA5F5B645BBE8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_F55D679D5BCC50ABBD200AB605196F6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_125AB2D692D67ECCD1CFA5F5B645BBE8_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_F55D679D5BCC50ABBD200AB605196F6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due, Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_F55D679D5BCC50ABBD200AB605196F6D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_F55D679D5BCC50ABBD200AB605196F6D" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_F55D679D5BCC50ABBD200AB605196F6D" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_195B3593D0D1769284F9A5F5B646669C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_9739700E614756538651000BEE339A33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_195B3593D0D1769284F9A5F5B646669C_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_9739700E614756538651000BEE339A33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Two Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_9739700E614756538651000BEE339A33" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_9739700E614756538651000BEE339A33" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_9739700E614756538651000BEE339A33" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_4455CE755875083FAEBFA5F5B6464856_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B2B84CD5B262553BB9E5E44A4767D327" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_4455CE755875083FAEBFA5F5B6464856_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B2B84CD5B262553BB9E5E44A4767D327" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Three Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B2B84CD5B262553BB9E5E44A4767D327" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B2B84CD5B262553BB9E5E44A4767D327" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_B2B84CD5B262553BB9E5E44A4767D327" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_B2499F471A9A34CB41A2A5F5B646198B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_75340A99A2F85C01934A8BBF6BA8EE04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_B2499F471A9A34CB41A2A5F5B646198B_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_75340A99A2F85C01934A8BBF6BA8EE04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Four Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_75340A99A2F85C01934A8BBF6BA8EE04" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_9C6965AEF528394D0596A5F5B6465E64_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_060CDFF404315164B09A39DFCAEC5CE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_9C6965AEF528394D0596A5F5B6465E64_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_060CDFF404315164B09A39DFCAEC5CE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Five Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_060CDFF404315164B09A39DFCAEC5CE5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6D201B3F88F8B83B419AA5F5B6461600_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48CDBC9D6182531B82FB9B85F49532F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_6D201B3F88F8B83B419AA5F5B6461600_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48CDBC9D6182531B82FB9B85F49532F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due Thereafter </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_48CDBC9D6182531B82FB9B85F49532F7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BDAF72547B04DD1159C4A5F5B64652A1_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_5B8008133F0D5CA598528F4CD1596758" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BDAF72547B04DD1159C4A5F5B64652A1_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_5B8008133F0D5CA598528F4CD1596758" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_5B8008133F0D5CA598528F4CD1596758" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetRetirementObligationDisclosureAbstract_590EE49C621F748CBC03A4DBE964FAC7_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationDisclosureAbstract_590EE49C621F748CBC03A4DBE964FAC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationDisclosureAbstract" xlink:label="loc_us-gaap_AssetRetirementObligationDisclosureAbstract_590EE49C621F748CBC03A4DBE964FAC7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CustomerConcentrationRiskMember_664CE13FDA0D192ABED4BDECC958436F_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerConcentrationRiskMember_664CE13FDA0D192ABED4BDECC958436F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Customer Concentration Risk </link:label>
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<link:label id="lab_us-gaap_ConcentrationRiskLineItems_8DB712C54A94EBF8CFECBDECC95822D9_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskLineItems_8DB712C54A94EBF8CFECBDECC95822D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk [Line Items] </link:label>
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<link:label id="lab_us-gaap_GasBalancingArrangementsAbstract_9A48B0F1A49C39803111BDECC9596E29_verboseLabel_en-US" xlink:label="lab_us-gaap_GasBalancingArrangementsAbstract_9A48B0F1A49C39803111BDECC9596E29" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Gas loaned to customers [Abstract] </link:label>
<link:label id="lab_us-gaap_GasBalancingArrangementsAbstract_9A48B0F1A49C39803111BDECC9596E29_label_en-US" xlink:label="lab_us-gaap_GasBalancingArrangementsAbstract_9A48B0F1A49C39803111BDECC9596E29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gas Balancing Arrangements [Abstract] </link:label>
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<link:label id="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE_terseLabel_en-US" xlink:label="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gas Balancing Measurement (in MMBtu) </link:label>
<link:label id="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE_label_en-US" xlink:label="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gas Balancing Measurement (in MMBtu) </link:label>
<link:label id="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE_documentation_en-US" xlink:label="lab_bwp_GasBalancingMeasurementinMMBtu_C624E2A5B369207B102CBDECC959C5AE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The amount of gas imbalance in terms of measure (MMBtu) as of the end of the period. </link:label>
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<link:label id="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C_terseLabel_en-US" xlink:label="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Average Market Price Of Gas Assumed </link:label>
<link:label id="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C_label_en-US" xlink:label="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Average Market Price Of Gas Assumed </link:label>
<link:label id="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C_documentation_en-US" xlink:label="lab_bwp_AverageMarketPriceOfGasAssumed_8E91A7E42766C54780ABBDECC9590A9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Average market price of natural gas assumed during the month prior to the balance sheet date and used to calculate the total market value of (1) gas held in storage on behalf of customers, and (2) gas owed to operating subsidiaries due to gas imbalances and gas loaned under parking and lending agreements. </link:label>
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<link:label id="lab_bwp_GasImbalanceToSubsidiariesAssetLiability_D4C79997C54E04878086BDECC9596D50_terseLabel_en-US" xlink:label="lab_bwp_GasImbalanceToSubsidiariesAssetLiability_D4C79997C54E04878086BDECC9596D50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gas Imbalance To Subsidiaries Asset Liability </link:label>
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<link:loc xlink:href="bwp-20181231.xsd#bwp_GasImbalanceToSubsidiariesAssetLiability" xlink:label="loc_bwp_GasImbalanceToSubsidiariesAssetLiability_D4C79997C54E04878086BDECC9596D50" xlink:type="locator"/>
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<link:label id="lab_bwp_NaturalGasLiquidsBalancingVolume_2FF9C5A90FED5E39862DBDECC9596AFF_terseLabel_en-US" xlink:label="lab_bwp_NaturalGasLiquidsBalancingVolume_2FF9C5A90FED5E39862DBDECC9596AFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Natural Gas Liquids Balancing Volume (in MMBbls) </link:label>
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<link:loc xlink:href="bwp-20181231.xsd#bwp_NaturalGasLiquidsBalancingVolume" xlink:label="loc_bwp_NaturalGasLiquidsBalancingVolume_2FF9C5A90FED5E39862DBDECC9596AFF" xlink:type="locator"/>
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<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_5C0B7B4FA77DF8F7A494DD2DB60EABA3" xlink:type="locator"/>
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<link:label id="lab_dei_EntityVoluntaryFilers_2AC44AF7062809F48729DD2DB60E7A01_label_en-US" xlink:label="lab_dei_EntityVoluntaryFilers_2AC44AF7062809F48729DD2DB60E7A01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Voluntary Filers </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_2AC44AF7062809F48729DD2DB60E7A01" xlink:type="locator"/>
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<link:label id="lab_dei_EntityCurrentReportingStatus_A70094E2273F579C1CB6DD2DB60EFF40_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_A70094E2273F579C1CB6DD2DB60EFF40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_A70094E2273F579C1CB6DD2DB60EFF40" xlink:type="locator"/>
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<link:label id="lab_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:label id="lab_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF_label_en-US" xlink:label="lab_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF" xlink:to="lab_dei_EntitySmallBusiness_20E5DFB095F14350C204DD2DB60E26CF" xlink:type="arc"/>
<link:label id="lab_dei_EntityEmergingGrowthCompany_6F0B43FB8F517A66F4B0DD2DB60E7BC2_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_6F0B43FB8F517A66F4B0DD2DB60E7BC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:label id="lab_dei_EntityEmergingGrowthCompany_6F0B43FB8F517A66F4B0DD2DB60E7BC2_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_6F0B43FB8F517A66F4B0DD2DB60E7BC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_6F0B43FB8F517A66F4B0DD2DB60E7BC2" xlink:type="locator"/>
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<link:label id="lab_dei_EntityShellCompany_A8AF152CA35A05ADC57DDD74AE7C302F_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany_A8AF152CA35A05ADC57DDD74AE7C302F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>
<link:label id="lab_dei_EntityShellCompany_A8AF152CA35A05ADC57DDD74AE7C302F_label_en-US" xlink:label="lab_dei_EntityShellCompany_A8AF152CA35A05ADC57DDD74AE7C302F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_A8AF152CA35A05ADC57DDD74AE7C302F" xlink:type="locator"/>
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<link:label id="lab_dei_EntityPublicFloat_BF23C167A9AF0596625EDD2DB60E0124_label_en-US" xlink:label="lab_dei_EntityPublicFloat_BF23C167A9AF0596625EDD2DB60E0124" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_BF23C167A9AF0596625EDD2DB60E0124" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_514557625757DE080A40A54B0056B086_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_514557625757DE080A40A54B0056B086" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Regulatory Liabilities [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfRegulatoryLiabilitiesTable" xlink:label="loc_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_514557625757DE080A40A54B0056B086" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Liability [Axis] </link:label>
<link:label id="lab_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Liability [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryLiabilityAxis" xlink:label="loc_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2" xlink:to="lab_us-gaap_RegulatoryLiabilityAxis_CADE1BD5BD4F44B00483A54B0056BDC2" xlink:type="arc"/>
<link:label id="lab_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Liability [Domain] </link:label>
<link:label id="lab_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Liability [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryLiabilityDomain" xlink:label="loc_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580" xlink:to="lab_us-gaap_RegulatoryLiabilityDomain_57B7AA4F86B1DAF65BC9A54B0056F580" xlink:type="arc"/>
<link:label id="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97_terseLabel_en-US" xlink:label="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cashout and fuel tracker </link:label>
<link:label id="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97_label_en-US" xlink:label="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cashout and Fuel Tracker [Member] </link:label>
<link:label id="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97_documentation_en-US" xlink:label="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Fuel costs that otherwise would have been charged to expense. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_CashoutAndFuelTrackerMember" xlink:label="loc_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:to="lab_bwp_CashoutAndFuelTrackerMember_2B55EB6177041FFDC842A54C428D6F97" xlink:type="arc"/>
<link:label id="lab_us-gaap_AssetRetirementObligationCostsMember_E93EC34E240D672FEB67A54B005726B9_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCostsMember_E93EC34E240D672FEB67A54B005726B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for other asset retirement </link:label>
<link:label id="lab_us-gaap_AssetRetirementObligationCostsMember_E93EC34E240D672FEB67A54B005726B9_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCostsMember_E93EC34E240D672FEB67A54B005726B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationCostsMember" xlink:label="loc_us-gaap_AssetRetirementObligationCostsMember_E93EC34E240D672FEB67A54B005726B9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LossOnReacquiredDebtMember_C72EF8A6C6841DF5EDA7A54B005C0AEC_verboseLabel_en-US" xlink:label="lab_us-gaap_LossOnReacquiredDebtMember_C72EF8A6C6841DF5EDA7A54B005C0AEC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized debt expense and premium on reacquired debt </link:label>
<link:label id="lab_us-gaap_LossOnReacquiredDebtMember_C72EF8A6C6841DF5EDA7A54B005C0AEC_label_en-US" xlink:label="lab_us-gaap_LossOnReacquiredDebtMember_C72EF8A6C6841DF5EDA7A54B005C0AEC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Loss on Reacquired Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossOnReacquiredDebtMember" xlink:label="loc_us-gaap_LossOnReacquiredDebtMember_C72EF8A6C6841DF5EDA7A54B005C0AEC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember_733BDEAC643B9BF39C34A54B005CA372_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember_733BDEAC643B9BF39C34A54B005CA372" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized discount on long-term debt </link:label>
<link:label id="lab_us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember_733BDEAC643B9BF39C34A54B005CA372_label_en-US" xlink:label="lab_us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember_733BDEAC643B9BF39C34A54B005CA372" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Gain (Loss) on Early Extinguishment of Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember" xlink:label="loc_us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember_733BDEAC643B9BF39C34A54B005CA372" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PostretirementBenefitCostsMember_8558DC415FC5BB8A0F35A54B005C32A7_terseLabel_en-US" xlink:label="lab_us-gaap_PostretirementBenefitCostsMember_8558DC415FC5BB8A0F35A54B005C32A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Postretirement benefits other than pension </link:label>
<link:label id="lab_us-gaap_PostretirementBenefitCostsMember_8558DC415FC5BB8A0F35A54B005C32A7_label_en-US" xlink:label="lab_us-gaap_PostretirementBenefitCostsMember_8558DC415FC5BB8A0F35A54B005C32A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Postretirement Benefit Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PostretirementBenefitCostsMember" xlink:label="loc_us-gaap_PostretirementBenefitCostsMember_8558DC415FC5BB8A0F35A54B005C32A7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryLiabilitiesLineItems_0B2D6832B092BBDC40D2A54B005DB511_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilitiesLineItems_0B2D6832B092BBDC40D2A54B005DB511" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Liabilities [Line Items] </link:label>
<link:label id="lab_us-gaap_RegulatoryLiabilitiesLineItems_0B2D6832B092BBDC40D2A54B005DB511_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilitiesLineItems_0B2D6832B092BBDC40D2A54B005DB511" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Liabilities [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryLiabilitiesLineItems" xlink:label="loc_us-gaap_RegulatoryLiabilitiesLineItems_0B2D6832B092BBDC40D2A54B005DB511" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RegulatoryLiabilities_AB5840EA3041CFD69FB5A54B005D0559_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilities_AB5840EA3041CFD69FB5A54B005D0559" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Regulatory Liabilities </link:label>
<link:label id="lab_us-gaap_RegulatoryLiabilities_AB5840EA3041CFD69FB5A54B005D0559_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilities_AB5840EA3041CFD69FB5A54B005D0559" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Regulatory Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegulatoryLiabilities" xlink:label="loc_us-gaap_RegulatoryLiabilities_AB5840EA3041CFD69FB5A54B005D0559" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock_7EF4682989AC3B1830638728ACEAFADD_verboseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock_2FC413D7A3F35D0A8D82DC8CBE333BAE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation </link:label>
<link:label id="lab_us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock_7EF4682989AC3B1830638728ACEAFADD_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock_2FC413D7A3F35D0A8D82DC8CBE333BAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Asset Retirement Obligations [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock_2FC413D7A3F35D0A8D82DC8CBE333BAE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BFBC73D12ABCE2B1E9368728AAC707F5_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_7B9C977A624E5FD4B247528BF1677571" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchase Commitment, Remaining Minimum Amount Committed </link:label>
<link:label id="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_BFBC73D12ABCE2B1E9368728AAC707F5_label_en-US" xlink:label="lab_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_7B9C977A624E5FD4B247528BF1677571" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Purchase Commitment, Remaining Minimum Amount Committed </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted" xlink:label="loc_us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted_7B9C977A624E5FD4B247528BF1677571" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NumberOfReportableSegments_F23DEA7B86822D04910CDDAC6EF2099C_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_F23DEA7B86822D04910CDDAC6EF2099C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of Reportable Segments (in ones) </link:label>
<link:label id="lab_us-gaap_NumberOfReportableSegments_F23DEA7B86822D04910CDDAC6EF2099C_label_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_F23DEA7B86822D04910CDDAC6EF2099C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Reportable Segments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_F23DEA7B86822D04910CDDAC6EF2099C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_D2C4DEFE6F03B2455CA7DDAC6EF2D3E3_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents_D2C4DEFE6F03B2455CA7DDAC6EF2D3E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted Cash and Cash Equivalents </link:label>
<link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_D2C4DEFE6F03B2455CA7DDAC6EF2D3E3_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents_D2C4DEFE6F03B2455CA7DDAC6EF2D3E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Cash and Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalents" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_D2C4DEFE6F03B2455CA7DDAC6EF2D3E3" xlink:type="locator"/>
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<link:label id="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D_terseLabel_en-US" xlink:label="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Materials And Supplies Held In Other Assets </link:label>
<link:label id="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D_label_en-US" xlink:label="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Materials And Supplies Held In Other Assets </link:label>
<link:label id="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D_documentation_en-US" xlink:label="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Remaining materials and supplies held in Other Assets. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MaterialsAndSuppliesHeldInOtherAssets" xlink:label="loc_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:to="lab_bwp_MaterialsAndSuppliesHeldInOtherAssets_96DEF4A2CC85EC21D1D4DDAC6EF3219D" xlink:type="arc"/>
<link:label id="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capitalized interest and allowance for borrowed funds used during construction </link:label>
<link:label id="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Allowance for Funds Used During Construction, Capitalized Interest </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest" xlink:label="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75" xlink:to="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest_7422DEA5CDA9A9E0C577DDAC6EF33D75" xlink:type="arc"/>
<link:label id="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Allowance for equity funds used during construction </link:label>
<link:label id="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity" xlink:label="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D" xlink:to="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_128217A7394F0D0BA05FDDAC6EF3ED1D" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestPropertyTable_C4F27F32DDC241DDC0F78728ACFA9EC4_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property [Table] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyTable_C4F27F32DDC241DDC0F78728ACFA9EC4_label_en-US" xlink:label="lab_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property [Table] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyTable_C4F27F32DDC241DDC0F78728ACFA9EC4_documentation_en-US" xlink:label="lab_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property [Table] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestPropertyTable" xlink:label="loc_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:to="lab_bwp_UndividedInterestPropertyTable_EB2F26AF9C465DA0BC8D0C1A6B181DC7" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_D0F7ED5FF5E2BA03118F8728ACFA5011_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_7D36369229BC58618B582AFE979BD846" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property, Plant and Equipment [Axis] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_D0F7ED5FF5E2BA03118F8728ACFA5011_label_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_7D36369229BC58618B582AFE979BD846" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property, Plant and Equipment [Axis] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_D0F7ED5FF5E2BA03118F8728ACFA5011_documentation_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_7D36369229BC58618B582AFE979BD846" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property, Plant and Equipment [Axis] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestPropertyPlantAndEquipmentAxis" xlink:label="loc_bwp_UndividedInterestPropertyPlantAndEquipmentAxis_7D36369229BC58618B582AFE979BD846" xlink:type="locator"/>
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<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_CEE60713F09F25469A7A8728ACFBD149_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_A56429EABBBF5CD89EA52862957B77CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property, Plant and Equipment [Domain] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_CEE60713F09F25469A7A8728ACFBD149_label_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_A56429EABBBF5CD89EA52862957B77CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property, Plant and Equipment [Domain] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_CEE60713F09F25469A7A8728ACFBD149_documentation_en-US" xlink:label="lab_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_A56429EABBBF5CD89EA52862957B77CA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Domain] for Undivided Interest Property, Plant and Equipment [Axis] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestPropertyPlantAndEquipmentDomain" xlink:label="loc_bwp_UndividedInterestPropertyPlantAndEquipmentDomain_A56429EABBBF5CD89EA52862957B77CA" xlink:type="locator"/>
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<link:label id="lab_bwp_BistineauStorageMember_BF8BB7EE02E1C45E73EB8728ACFB742F_terseLabel_en-US" xlink:label="lab_bwp_BistineauStorageMember_B5109259700556879EE73F4C102DE11A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Bistineau storage </link:label>
<link:label id="lab_bwp_BistineauStorageMember_BF8BB7EE02E1C45E73EB8728ACFB742F_label_en-US" xlink:label="lab_bwp_BistineauStorageMember_B5109259700556879EE73F4C102DE11A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Bistineau Storage [Member] </link:label>
<link:label id="lab_bwp_BistineauStorageMember_BF8BB7EE02E1C45E73EB8728ACFB742F_documentation_en-US" xlink:label="lab_bwp_BistineauStorageMember_B5109259700556879EE73F4C102DE11A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> This is the partnership's undivided interests in other assets for Bistineau Storage Facility. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_BistineauStorageMember" xlink:label="loc_bwp_BistineauStorageMember_B5109259700556879EE73F4C102DE11A" xlink:type="locator"/>
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<link:label id="lab_bwp_MobileBayPipelineMember_A41ABD7E3067B773ABF38728ACFBEC48_terseLabel_en-US" xlink:label="lab_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Mobile Bay Pipeline </link:label>
<link:label id="lab_bwp_MobileBayPipelineMember_A41ABD7E3067B773ABF38728ACFBEC48_label_en-US" xlink:label="lab_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Mobile Bay Pipeline [Member] </link:label>
<link:label id="lab_bwp_MobileBayPipelineMember_A41ABD7E3067B773ABF38728ACFBEC48_documentation_en-US" xlink:label="lab_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> This is the partnership's undivided interests in other assets for Mobile Bay Pipeline. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MobileBayPipelineMember" xlink:label="loc_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:to="lab_bwp_MobileBayPipelineMember_13F1859F018A552686C5E464DE2B4D4C" xlink:type="arc"/>
<link:label id="lab_bwp_NGLpipelinesandfacilitiesMember_10F099FEFF71C996415A8728ACFC4E76_terseLabel_en-US" xlink:label="lab_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> NGL pipelines and facilities </link:label>
<link:label id="lab_bwp_NGLpipelinesandfacilitiesMember_10F099FEFF71C996415A8728ACFC4E76_label_en-US" xlink:label="lab_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> NGL pipelines and facilities [Member] </link:label>
<link:label id="lab_bwp_NGLpipelinesandfacilitiesMember_10F099FEFF71C996415A8728ACFC4E76_documentation_en-US" xlink:label="lab_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> This is the partnership's undivided interests in NGL pipelines and facilities. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_NGLpipelinesandfacilitiesMember" xlink:label="loc_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:to="lab_bwp_NGLpipelinesandfacilitiesMember_507A0CFFA13C5817AF4E35FE8253277D" xlink:type="arc"/>
<link:label id="lab_bwp_OffshoreAndOtherAssetsMember_897B489D4FCBE3C5655F8728ACFC029A_terseLabel_en-US" xlink:label="lab_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Offshore and other assets </link:label>
<link:label id="lab_bwp_OffshoreAndOtherAssetsMember_897B489D4FCBE3C5655F8728ACFC029A_label_en-US" xlink:label="lab_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Offshore and Other Assets [Member] </link:label>
<link:label id="lab_bwp_OffshoreAndOtherAssetsMember_897B489D4FCBE3C5655F8728ACFC029A_documentation_en-US" xlink:label="lab_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> This is the partnership's undivided interests in other assets for offshore assets and other. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OffshoreAndOtherAssetsMember" xlink:label="loc_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:to="lab_bwp_OffshoreAndOtherAssetsMember_13284C6F338B552AA0C394F349DF31C8" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestPropertyLineItems_B3CD549B2A6F2F9DEB998728ACFCD057_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property [Line Items] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyLineItems_B3CD549B2A6F2F9DEB998728ACFCD057_label_en-US" xlink:label="lab_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided Interest Property [Line Items] </link:label>
<link:label id="lab_bwp_UndividedInterestPropertyLineItems_B3CD549B2A6F2F9DEB998728ACFCD057_documentation_en-US" xlink:label="lab_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Line Items] for Undivided Interest Property [Table] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestPropertyLineItems" xlink:label="loc_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:to="lab_bwp_UndividedInterestPropertyLineItems_0850863C1FFF50A8A182CF6D7637A16B" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestsInStorageFacility_FF3D8F18FE2BC8318E008728ACFC443D_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided interests in storage facility </link:label>
<link:label id="lab_bwp_UndividedInterestsInStorageFacility_FF3D8F18FE2BC8318E008728ACFC443D_label_en-US" xlink:label="lab_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided interests in storage facility </link:label>
<link:label id="lab_bwp_UndividedInterestsInStorageFacility_FF3D8F18FE2BC8318E008728ACFC443D_documentation_en-US" xlink:label="lab_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The ownership percentage that the partnership holds in an undivided interest in a storage facility. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestsInStorageFacility" xlink:label="loc_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:to="lab_bwp_UndividedInterestsInStorageFacility_B9D497E09EA95F82B745520CCB084E0C" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestInPipeline_B7EB5AE10B4EF4112DDC8728ACFC047F_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided interest in pipeline </link:label>
<link:label id="lab_bwp_UndividedInterestInPipeline_B7EB5AE10B4EF4112DDC8728ACFC047F_label_en-US" xlink:label="lab_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided interest in pipeline </link:label>
<link:label id="lab_bwp_UndividedInterestInPipeline_B7EB5AE10B4EF4112DDC8728ACFC047F_documentation_en-US" xlink:label="lab_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The ownership percentage that the partnership holds in an undivided interest in a pipeline. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestInPipeline" xlink:label="loc_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:to="lab_bwp_UndividedInterestInPipeline_3F5530A06C205181A53F02BAF03D6AD3" xlink:type="arc"/>
<link:label id="lab_bwp_UndividedInterestinTwoEthyleneWells_3EEF09F31123D7016A8A8728ACFCE413_terseLabel_en-US" xlink:label="lab_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Undivided interest in two ethylene wells </link:label>
<link:label id="lab_bwp_UndividedInterestinTwoEthyleneWells_3EEF09F31123D7016A8A8728ACFCE413_label_en-US" xlink:label="lab_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Undivided Interest in Two Ethylene Wells </link:label>
<link:label id="lab_bwp_UndividedInterestinTwoEthyleneWells_3EEF09F31123D7016A8A8728ACFCE413_documentation_en-US" xlink:label="lab_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The ownership percentage that the Partnership holds in an undivided interest in two ethylene wells and supporting surface facilities </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_UndividedInterestinTwoEthyleneWells" xlink:label="loc_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:to="lab_bwp_UndividedInterestinTwoEthyleneWells_8D887A57911D50A4A5EF630FEE207FCB" xlink:type="arc"/>
<link:label id="lab_bwp_GrossPpeInvestment_1A3438CDDFB0D07292188728ACFD2705_label_en-US" xlink:label="lab_bwp_GrossPpeInvestment_4FB8D8621EBD54B8B6531FA7A59E44C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross PPE Investment </link:label>
<link:label id="lab_bwp_GrossPpeInvestment_1A3438CDDFB0D07292188728ACFD2705_documentation_en-US" xlink:label="lab_bwp_GrossPpeInvestment_4FB8D8621EBD54B8B6531FA7A59E44C5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Gross amount, at the balance sheet date, of long-lived physical assets for partnership undivided interest used in the normal conduct of business and not intended for resale. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_GrossPpeInvestment" xlink:label="loc_bwp_GrossPpeInvestment_4FB8D8621EBD54B8B6531FA7A59E44C5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_GrossPpeInvestment_4FB8D8621EBD54B8B6531FA7A59E44C5" xlink:to="lab_bwp_GrossPpeInvestment_4FB8D8621EBD54B8B6531FA7A59E44C5" xlink:type="arc"/>
<link:label id="lab_bwp_AccumulatedDepreciation_37DFE2C71EBF54A5271C8728ACFDF70D_label_en-US" xlink:label="lab_bwp_AccumulatedDepreciation_11536BE84C745DACA098472A021E8FC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation </link:label>
<link:label id="lab_bwp_AccumulatedDepreciation_37DFE2C71EBF54A5271C8728ACFDF70D_documentation_en-US" xlink:label="lab_bwp_AccumulatedDepreciation_11536BE84C745DACA098472A021E8FC5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land for undivided partnership interest) that has been recognized in the income statement. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_AccumulatedDepreciation" xlink:label="loc_bwp_AccumulatedDepreciation_11536BE84C745DACA098472A021E8FC5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_AccumulatedDepreciation_11536BE84C745DACA098472A021E8FC5" xlink:to="lab_bwp_AccumulatedDepreciation_11536BE84C745DACA098472A021E8FC5" xlink:type="arc"/>
<link:label id="lab_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B_label_en-US" xlink:label="lab_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application [Abstract] </link:label>
<link:label id="lab_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B_documentation_en-US" xlink:label="lab_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application [Abstract] </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_RevenueInitialApplicationAbstract" xlink:label="loc_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B" xlink:to="lab_bwp_RevenueInitialApplicationAbstract_13ABF3862112515D8B9BDCB6B276D62B" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application Period Cumulative Effect Transition [Table] </link:label>
<link:label id="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15_label_en-US" xlink:label="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application Period Cumulative Effect Transition [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15" xlink:to="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_C30F6C15717A4681A771DCB6B277EC15" xlink:type="arc"/>
<link:label id="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C_terseLabel_en-US" xlink:label="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Initial Application Period Cumulative Effect Transition [Axis] </link:label>
<link:label id="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C_label_en-US" xlink:label="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Initial Application Period Cumulative Effect Transition [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C" xlink:to="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis_79DD884D16DA2B68B0BBDCB6B279303C" xlink:type="arc"/>
<link:label id="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671_terseLabel_en-US" xlink:label="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Initial Application Period Cumulative Effect Transition [Domain] </link:label>
<link:label id="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671_label_en-US" xlink:label="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Initial Application Period Cumulative Effect Transition [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain" xlink:label="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671" xlink:to="lab_us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain_56EECDE0D47CB8163DC4DCB6B2793671" xlink:type="arc"/>
<link:label id="lab_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814_terseLabel_en-US" xlink:label="lab_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Difference between Revenue Guidance in Effect before and after Topic 606 </link:label>
<link:label id="lab_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814_label_en-US" xlink:label="lab_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Difference between Revenue Guidance in Effect before and after Topic 606 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member" xlink:label="loc_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814" xlink:to="lab_us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member_C83F32B38F73CF133C66DCB6B279D814" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application Period Cumulative Effect Transition [Line Items] </link:label>
<link:label id="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7_label_en-US" xlink:label="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Initial Application Period Cumulative Effect Transition [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7" xlink:to="lab_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_E5FB9D47B24F8D631285DCB6B27AF4B7" xlink:type="arc"/>
<link:label id="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D66AD89B28888D81870FDCB6B27A5745_verboseLabel_en-US" xlink:label="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D66AD89B28888D81870FDCB6B27A5745" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cumulative Effect of New Accounting Principle in Period of Adoption </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D66AD89B28888D81870FDCB6B27A5745" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D66AD89B28888D81870FDCB6B27A5745" xlink:to="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_D66AD89B28888D81870FDCB6B27A5745" xlink:type="arc"/>
<link:label id="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8_terseLabel_en-US" xlink:label="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Liabilities Cumulative Effect Increase </link:label>
<link:label id="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8_label_en-US" xlink:label="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities Cumulative Effect Increase </link:label>
<link:label id="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8_documentation_en-US" xlink:label="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The cumulative increase to Other liabilities as a result of a new accounting principle applied in the period of adoption. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherLiabilitiesCumulativeEffectIncrease" xlink:label="loc_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:to="lab_bwp_OtherLiabilitiesCumulativeEffectIncrease_2878876309EE52A2682ADCB6B27B40A8" xlink:type="arc"/>
<link:label id="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96_verboseLabel_en-US" xlink:label="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Current Gas Stored Underground Cumulative Effect Decrease </link:label>
<link:label id="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96_label_en-US" xlink:label="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Gas Stored Underground Cumulative Effect Decrease </link:label>
<link:label id="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96_documentation_en-US" xlink:label="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The cumulative decrease to Current gas stored underground as a result of a new accounting principle applied in the period of adoption. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease" xlink:label="loc_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:to="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_231DAF04C46C2A922D6CDCB6B27B4C96" xlink:type="arc"/>
<link:label id="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E_terseLabel_en-US" xlink:label="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Service Contracts Duration </link:label>
<link:label id="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E_label_en-US" xlink:label="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Service Contracts Duration </link:label>
<link:label id="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E_documentation_en-US" xlink:label="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Approximate length of time service contracts can range although shorter or longer term contracts are possible. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ServiceContractsDuration" xlink:label="loc_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:to="lab_bwp_ServiceContractsDuration_505EF57C08CFBC1AFC83DCB6B27B856E" xlink:type="arc"/>
<link:label id="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52_terseLabel_en-US" xlink:label="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Expected Payment of Invoiced Services </link:label>
<link:label id="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52_label_en-US" xlink:label="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Expected Payment of Invoiced Services </link:label>
<link:label id="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52_documentation_en-US" xlink:label="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The general timeframe of expected payment of invoiced services depending on the terms of the contract. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ExpectedPaymentofInvoicedServices" xlink:label="loc_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:to="lab_bwp_ExpectedPaymentofInvoicedServices_79A710FCC62730F24FA0DCB6B27BAB52" xlink:type="arc"/>
<link:label id="lab_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834_terseLabel_en-US" xlink:label="lab_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Previously Reported </link:label>
<link:label id="lab_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834_label_en-US" xlink:label="lab_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Previously Reported [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScenarioPreviouslyReportedMember" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834" xlink:to="lab_srt_ScenarioPreviouslyReportedMember_1104B39E46AAC362756FC81125B32834" xlink:type="arc"/>
<link:label id="lab_us-gaap_EnergyRelatedInventoryGasStoredUnderground_7762EAA6100B74C80A68C81125B3702E_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyRelatedInventoryGasStoredUnderground_7762EAA6100B74C80A68C81125B3702E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other current assets (gas stored underground) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyRelatedInventoryGasStoredUnderground" xlink:label="loc_us-gaap_EnergyRelatedInventoryGasStoredUnderground_7762EAA6100B74C80A68C81125B3702E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnergyRelatedInventoryGasStoredUnderground_7762EAA6100B74C80A68C81125B3702E" xlink:to="lab_us-gaap_EnergyRelatedInventoryGasStoredUnderground_7762EAA6100B74C80A68C81125B3702E" xlink:type="arc"/>
<link:label id="lab_bwp_MiscellaneousOtherAssetsNoncurrent_9B50C864CAC7B16C82D1C81125B3390B_verboseLabel_en-US" xlink:label="lab_bwp_MiscellaneousOtherAssetsNoncurrent_9B50C864CAC7B16C82D1C81125B3390B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_MiscellaneousOtherAssetsNoncurrent" xlink:label="loc_bwp_MiscellaneousOtherAssetsNoncurrent_9B50C864CAC7B16C82D1C81125B3390B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_MiscellaneousOtherAssetsNoncurrent_9B50C864CAC7B16C82D1C81125B3390B" xlink:to="lab_bwp_MiscellaneousOtherAssetsNoncurrent_9B50C864CAC7B16C82D1C81125B3390B" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_7A722A2D4A818009511AC81125B3D37B_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_7A722A2D4A818009511AC81125B3D37B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Other liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_7A722A2D4A818009511AC81125B3D37B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_7A722A2D4A818009511AC81125B3D37B" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_7A722A2D4A818009511AC81125B3D37B" xlink:type="arc"/>
<link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6A4E11922EF60AF20461C81125B343E6_terseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6A4E11922EF60AF20461C81125B343E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Partners' Capital </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6A4E11922EF60AF20461C81125B343E6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6A4E11922EF60AF20461C81125B343E6" xlink:to="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_6A4E11922EF60AF20461C81125B343E6" xlink:type="arc"/>
<link:label id="lab_bwp_TransportationRevenue_CF534034615D6F6390EAC81125B3B773_verboseLabel_en-US" xlink:label="lab_bwp_TransportationRevenue_CF534034615D6F6390EAC81125B3B773" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Transportation </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_TransportationRevenue" xlink:label="loc_bwp_TransportationRevenue_CF534034615D6F6390EAC81125B3B773" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_TransportationRevenue_CF534034615D6F6390EAC81125B3B773" xlink:to="lab_bwp_TransportationRevenue_CF534034615D6F6390EAC81125B3B773" xlink:type="arc"/>
<link:label id="lab_us-gaap_Revenues_6F5274C92AE0F3659F1EC81125B38B99_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_6F5274C92AE0F3659F1EC81125B38B99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total operating revenues </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_6F5274C92AE0F3659F1EC81125B38B99" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_6F5274C92AE0F3659F1EC81125B38B99" xlink:to="lab_us-gaap_Revenues_6F5274C92AE0F3659F1EC81125B38B99" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FCD887B3E5C13763DCFAC81125B33317_verboseLabel_en-US" xlink:label="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FCD887B3E5C13763DCFAC81125B33317" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Fuel and transportation expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfDomesticRegulatedGasRevenue" xlink:label="loc_us-gaap_CostOfDomesticRegulatedGasRevenue_FCD887B3E5C13763DCFAC81125B33317" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfDomesticRegulatedGasRevenue_FCD887B3E5C13763DCFAC81125B33317" xlink:to="lab_us-gaap_CostOfDomesticRegulatedGasRevenue_FCD887B3E5C13763DCFAC81125B33317" xlink:type="arc"/>
<link:label id="lab_bwp_PensionandSRPPlansMember_4E3B76674545FDDCDB4BBE3ED1195FE8_verboseLabel_en-US" xlink:label="lab_bwp_PensionandSRPPlansMember_4E3B76674545FDDCDB4BBE3ED1195FE8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Retirement Plans </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_PensionandSRPPlansMember" xlink:label="loc_bwp_PensionandSRPPlansMember_4E3B76674545FDDCDB4BBE3ED1195FE8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_PensionandSRPPlansMember_4E3B76674545FDDCDB4BBE3ED1195FE8" xlink:to="lab_bwp_PensionandSRPPlansMember_4E3B76674545FDDCDB4BBE3ED1195FE8" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_6BC4BA3A7010D0B8957DBDECC9B2DF72_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_6BC4BA3A7010D0B8957DBDECC9B2DF72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Future Benefit Payment [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_6BC4BA3A7010D0B8957DBDECC9B2DF72" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_6BC4BA3A7010D0B8957DBDECC9B2DF72" xlink:to="lab_us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract_6BC4BA3A7010D0B8957DBDECC9B2DF72" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_2F036F6E54BC69DCC350BDECC9B212B4" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Future Benefit Payment, Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_D5DA81E31A6A2DB5D0FEBDECC9B2142C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_50282102D36E9E6FDC8BBDECC9B2AE5E_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_50282102D36E9E6FDC8BBDECC9B2AE5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_50282102D36E9E6FDC8BBDECC9B2AE5E_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_50282102D36E9E6FDC8BBDECC9B2AE5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Expected Future Benefit Payment, Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_50282102D36E9E6FDC8BBDECC9B2AE5E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_19132232D1BBF6DE4035BDECC9B3C4EA_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_19132232D1BBF6DE4035BDECC9B3C4EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
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<link:label id="lab_bwp_LongTermCashBonusPlanMember_6444E292F65DA1229E4EDDABAFA9DCAB_terseLabel_en-US" xlink:label="lab_bwp_LongTermCashBonusPlanMember_6444E292F65DA1229E4EDDABAFA9DCAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-Term Cash Bonus Plan </link:label>
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<link:label id="lab_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_BB7CF9742814138798B9C9313526A911_label_en-US" xlink:label="lab_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_BB7CF9742814138798B9C9313526A911" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Noncash Investing and Financing Items [Abstract] </link:label>
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<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_FFE70FEBC04058DF6966E2587DB6E679_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_FFE70FEBC04058DF6966E2587DB6E679" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] </link:label>
<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_FFE70FEBC04058DF6966E2587DB6E679_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_FFE70FEBC04058DF6966E2587DB6E679" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_FFE70FEBC04058DF6966E2587DB6E679" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3D253F78ED1415478A94E2587DB70B0E_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_3D253F78ED1415478A94E2587DB70B0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] </link:label>
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<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8B91F537BD4F154A9B8FE25CAB6F56CE_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8B91F537BD4F154A9B8FE25CAB6F56CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period </link:label>
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<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligation_6F89DC3D85482FBA39D3E2587DB71A60_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligation_6F89DC3D85482FBA39D3E2587DB71A60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Estimated revenues from contracts with customers from unsatisfied performance obligations as of December 31, 2018 </link:label>
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<link:label id="lab_bwp_OperatingLeasesFutureMinimumLeaseRevenues_38F7E273D6BCFBCB0277E2587DB7D8B8_terseLabel_en-US" xlink:label="lab_bwp_OperatingLeasesFutureMinimumLeaseRevenues_38F7E273D6BCFBCB0277E2587DB7D8B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating revenues which are fixed and determinable (operating leases) </link:label>
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<link:label id="lab_bwp_CommittedFirmAgreements_3263F9B21779702CF1A9E2587DB793B0_terseLabel_en-US" xlink:label="lab_bwp_CommittedFirmAgreements_3263F9B21779702CF1A9E2587DB793B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total projected operating revenues under committed firm agreements </link:label>
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<link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_14AEDF92D26F2578E5368728AC81D7D2_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_4C0376CFE0EF5A57BDA5763BA563EC08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities recorded </link:label>
<link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_14AEDF92D26F2578E5368728AC81D7D2_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesIncurred_4C0376CFE0EF5A57BDA5763BA563EC08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation, Liabilities Incurred </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationLiabilitiesIncurred" xlink:label="loc_us-gaap_AssetRetirementObligationLiabilitiesIncurred_4C0376CFE0EF5A57BDA5763BA563EC08" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_A2023525AC10E756A4E38728AC81ED92_negatedLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_0F7E8A3A21D7544C8341BCFEF2F08A09" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Liabilities settled </link:label>
<link:label id="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_A2023525AC10E756A4E38728AC81ED92_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationLiabilitiesSettled_0F7E8A3A21D7544C8341BCFEF2F08A09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation, Liabilities Settled </link:label>
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<link:label id="lab_us-gaap_AssetRetirementObligation_708D79D0485101AE0F4F8728AC82C931_periodEndLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligation_264617F5CF4551C5A346FDC7213A536F" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Balance at end of year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligation" xlink:label="loc_us-gaap_AssetRetirementObligation_264617F5CF4551C5A346FDC7213A536F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetRetirementObligationCurrent_3FD83FD681042AFD621E8728AC829BB2_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCurrent_4FAE6A030AF85694A610A8A05CB28517" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Retirement Obligation, Current </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationsNoncurrent" xlink:label="loc_us-gaap_AssetRetirementObligationsNoncurrent_B73D9A94E5FC57888DB4453D294E9938" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfCapitalUnitsTable_AE0312A760DD923DC6E8C93137102794_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCapitalUnitsTable_AE0312A760DD923DC6E8C93137102794" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Capital Units [Table] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfCapitalUnitsTable" xlink:label="loc_us-gaap_ScheduleOfCapitalUnitsTable_AE0312A760DD923DC6E8C93137102794" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CapitalUnitLineItems_784868C9C923E3B1A1ACC9313711CAD7_label_en-US" xlink:label="lab_us-gaap_CapitalUnitLineItems_784868C9C923E3B1A1ACC9313711CAD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Unit [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalUnitLineItems" xlink:label="loc_us-gaap_CapitalUnitLineItems_784868C9C923E3B1A1ACC9313711CAD7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_5632FDBC23243F8B389DC9E341737B13_verboseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_5632FDBC23243F8B389DC9E341737B13" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Number of Common Units </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_5632FDBC23243F8B389DC9E341737B13" xlink:type="locator"/>
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<link:label id="lab_bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits_5AFFADCB246EECFE70E3C9313711E44C_terseLabel_en-US" xlink:label="lab_bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits_5AFFADCB246EECFE70E3C9313711E44C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of common units registered for resale under Amended and Restated Registration Rights Agreement (in number of units) </link:label>
<link:label id="lab_bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits_5AFFADCB246EECFE70E3C9313711E44C_label_en-US" xlink:label="lab_bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits_5AFFADCB246EECFE70E3C9313711E44C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of common units registered for resale under Amended and Restated Registration Rights Agreement (in number of units) </link:label>
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<link:loc xlink:href="bwp-20181231.xsd#bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits" xlink:label="loc_bwp_NumberOfCommonUnitsRegisteredForResaleUnderAmendedAndRestatedRegistrationRightsAgreementInNumberOfUnits_5AFFADCB246EECFE70E3C9313711E44C" xlink:type="locator"/>
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<link:label id="lab_bwp_MaximumAmountPartnershipMustPayForReimbursementOfUnderwritingDiscountsAndCommissionsInDollarsPerUnit_06CC38415DF8FACCF2C2C9313712B67F_terseLabel_en-US" xlink:label="lab_bwp_MaximumAmountPartnershipMustPayForReimbursementOfUnderwritingDiscountsAndCommissionsInDollarsPerUnit_06CC38415DF8FACCF2C2C9313712B67F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum amount Partnership must pay for reimbursement of underwriting discounts and commissions (in dollars per unit) </link:label>
<link:label id="lab_bwp_MaximumAmountPartnershipMustPayForReimbursementOfUnderwritingDiscountsAndCommissionsInDollarsPerUnit_06CC38415DF8FACCF2C2C9313712B67F_label_en-US" xlink:label="lab_bwp_MaximumAmountPartnershipMustPayForReimbursementOfUnderwritingDiscountsAndCommissionsInDollarsPerUnit_06CC38415DF8FACCF2C2C9313712B67F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum amount Partnership must pay for reimbursement of underwriting discounts and commissions (in dollars per unit) </link:label>
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<link:label id="lab_us-gaap_RegistrationPaymentArrangementAccrualCarryingValue_85265BDB29523573E173C931371280BF_terseLabel_en-US" xlink:label="lab_us-gaap_RegistrationPaymentArrangementAccrualCarryingValue_85265BDB29523573E173C931371280BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Registration Payment Arrangement, Accrual Carrying Value </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RegistrationPaymentArrangementAccrualCarryingValue" xlink:label="loc_us-gaap_RegistrationPaymentArrangementAccrualCarryingValue_85265BDB29523573E173C931371280BF" xlink:type="locator"/>
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<link:label id="lab_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC_terseLabel_en-US" xlink:label="lab_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product and Service [Axis] </link:label>
<link:label id="lab_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC_label_en-US" xlink:label="lab_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product and Service [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC" xlink:to="lab_srt_ProductOrServiceAxis_D9CA2D6B4F7C72C6BDABDD2DB4F4CBCC" xlink:type="arc"/>
<link:label id="lab_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532_terseLabel_en-US" xlink:label="lab_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product and Service [Domain] </link:label>
<link:label id="lab_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532_label_en-US" xlink:label="lab_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product and Service [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532" xlink:to="lab_srt_ProductsAndServicesDomain_AFC9069F7DCA142E5238DD2DB4F4A532" xlink:type="arc"/>
<link:label id="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A_terseLabel_en-US" xlink:label="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Firm Service </link:label>
<link:label id="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A_label_en-US" xlink:label="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Firm Service Contracts [Member] </link:label>
<link:label id="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A_documentation_en-US" xlink:label="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Firm Service Contracts: Firm service that allows customers the ability to reserve a specific amount of pipeline capacity at specified receipt and delivery points on the Partnership's system (transportation service) or customers can reserve a specific amount of storage capacity at specified injection and withdrawal points at the Partnership’s storage facilities (storage service) . </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_FirmServiceContractsMember" xlink:label="loc_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:to="lab_bwp_FirmServiceContractsMember_5C964229C04B9E2E4521DD2DB4F43A9A" xlink:type="arc"/>
<link:label id="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744_terseLabel_en-US" xlink:label="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interruptible Service </link:label>
<link:label id="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744_label_en-US" xlink:label="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interruptible Service Contracts [Member] </link:label>
<link:label id="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744_documentation_en-US" xlink:label="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Interruptible Service Contracts: Contracts that agree to transport natural gas or natural gas liquids for a customer when capacity is available. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_InterruptibleServiceContractsMember" xlink:label="loc_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:to="lab_bwp_InterruptibleServiceContractsMember_394FEA3333CF62EB64CEDD2DB4F5B744" xlink:type="arc"/>
<link:label id="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C_terseLabel_en-US" xlink:label="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other revenues </link:label>
<link:label id="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C_label_en-US" xlink:label="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other revenues contracts [Member] </link:label>
<link:label id="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C_documentation_en-US" xlink:label="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other revenues contracts: Contracts with customers primarily for the sale of excess natural gas or natural gas liquids and brine supply services. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherrevenuescontractsMember" xlink:label="loc_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:to="lab_bwp_OtherrevenuescontractsMember_874C09704A8791A0D59ADD2DB4F57A9C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Line Items] </link:label>
<link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0" xlink:to="lab_us-gaap_DisaggregationOfRevenueLineItems_E98D91A7AFB78A9D9350DD2DB4F563A0" xlink:type="arc"/>
<link:label id="lab_us-gaap_NumberOfReportableSegments_5158E319ACCC31C19ED9DD2DB4F5CF6E_verboseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_5158E319ACCC31C19ED9DD2DB4F5CF6E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Number of Reportable Segments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_5158E319ACCC31C19ED9DD2DB4F5CF6E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfReportableSegments_5158E319ACCC31C19ED9DD2DB4F5CF6E" xlink:to="lab_us-gaap_NumberOfReportableSegments_5158E319ACCC31C19ED9DD2DB4F5CF6E" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenues from Contracts with Customers </link:label>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer, Excluding Assessed Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5BDA7331FD752A72F2FADD2DB4F5575E" xlink:type="arc"/>
<link:label id="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD_terseLabel_en-US" xlink:label="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other operating revenues </link:label>
<link:label id="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD_label_en-US" xlink:label="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Operating Revenues </link:label>
<link:label id="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD_documentation_en-US" xlink:label="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Partnership and do not represent revenues earned from contracts with customers. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_OtherOperatingRevenues" xlink:label="loc_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:to="lab_bwp_OtherOperatingRevenues_005A00ECEBEF0FB7C942DD2DB4F64BFD" xlink:type="arc"/>
<link:label id="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF_terseLabel_en-US" xlink:label="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Projected Benefit Obligation, Fair Value of Assets, Funded Status and the Amounts Not Yet Recognized As Components of Net Periodic Pension and Postretirement Benefits Cost </link:label>
<link:label id="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF_label_en-US" xlink:label="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Projected Benefit Obligation, Fair Value of Assets, Funded Status and the Amounts Not Yet Recognized As Components of Net Periodic Pension and Postretirement Benefits Cost [Table Text Block] </link:label>
<link:label id="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF_documentation_en-US" xlink:label="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Tabular disclosure of projected benefit obligation, fair value of assets, funded status and the amounts not yet recognized as components of net periodic pension and postretirement benefits cost for the retirement plans and postretirement benefits other than pension. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock" xlink:label="loc_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:to="lab_bwp_ProjectedBenefitObligationFairValueOfAssetsFundedStatusAndAmountsNotYetRecognizedAsComponentsOfNetPeriodicPensionAndPostretirementBenefitsCostTableTextBlock_96C8F3B7851ABE074DF255941E2881AF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets </link:label>
<link:label id="lab_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13" xlink:to="lab_us-gaap_ScheduleOfAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssetsTableTextBlock_2ABCC9A4AE0686B0187755941E294F13" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Net Periodic Benefit Cost </link:label>
<link:label id="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317_label_en-US" xlink:label="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Net Benefit Costs [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317" xlink:to="lab_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_9172D6D495898FCD7A2455941E29E317" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Expected Benefit Payments </link:label>
<link:label id="lab_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2_label_en-US" xlink:label="lab_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Expected Benefit Payments [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2" xlink:to="lab_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_62E8966B263FE7F0B90955941E291CB2" xlink:type="arc"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_C37B2B619CE8C8982A51BDECC9ABCD6D_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_C37B2B619CE8C8982A51BDECC9ABCD6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] </link:label>
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<link:label id="lab_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_99F96AC17057A960C4308728AAC4DAE8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_8DC2CA0C83325607B7DDC015375D54AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Leases of Lessee </link:label>
<link:label id="lab_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_99F96AC17057A960C4308728AAC4DAE8_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock_8DC2CA0C83325607B7DDC015375D54AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Disclosure [Table Text Block] </link:label>
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<link:label id="lab_bwp_PipelineCapacityAgreementsTableTextBlock_D33F5CAE087B7EB34BB78728AAC405C2_verboseLabel_en-US" xlink:label="lab_bwp_PipelineCapacityAgreementsTableTextBlock_2B60655D87F158CBAF5E23A9CCB9FD51" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Pipeline Capacity Agreements </link:label>
<link:label id="lab_bwp_PipelineCapacityAgreementsTableTextBlock_D33F5CAE087B7EB34BB78728AAC405C2_label_en-US" xlink:label="lab_bwp_PipelineCapacityAgreementsTableTextBlock_2B60655D87F158CBAF5E23A9CCB9FD51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pipeline Capacity Agreements [Table Text Block] </link:label>
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<link:loc xlink:href="bwp-20181231.xsd#bwp_PipelineCapacityAgreementsTableTextBlock" xlink:label="loc_bwp_PipelineCapacityAgreementsTableTextBlock_2B60655D87F158CBAF5E23A9CCB9FD51" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherCostAndExpenseOperating_76F0DF0FEF9DD020DCF65B84F2775C42_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_76F0DF0FEF9DD020DCF65B84F2775C42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other operating costs and expenses </link:label>
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<link:label id="lab_us-gaap_OperatingIncomeLoss_A7C86BDD80E7C06603D15B84F277F10C_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_A7C86BDD80E7C06603D15B84F277F10C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Operating (loss) income </link:label>
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<link:label id="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59_negatedTerseLabel_en-US" xlink:label="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Equity in earnings of subsidiaries </link:label>
<link:label id="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59_label_en-US" xlink:label="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity in earnings of subsidiaries </link:label>
<link:label id="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59_documentation_en-US" xlink:label="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> This is the equity in earnings of subsidiaries. This element is eliminated on consolidation. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_EquityInEarningsOfSubsidiaries" xlink:label="loc_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:to="lab_bwp_EquityInEarningsOfSubsidiaries_1FE00A962826D2BA7C765B84F278DF59" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_55079F19AB9E2AEE24755B84F27876FE_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_55079F19AB9E2AEE24755B84F27876FE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Miscellaneous other income, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_55079F19AB9E2AEE24755B84F27876FE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_55079F19AB9E2AEE24755B84F27876FE" xlink:to="lab_us-gaap_OtherNonoperatingIncomeExpense_55079F19AB9E2AEE24755B84F27876FE" xlink:type="arc"/>
<link:label id="lab_us-gaap_NonoperatingIncomeExpense_FE55F0284F93058976D95B84F278F8B5_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_FE55F0284F93058976D95B84F278F8B5" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US"> Total other (income) deductions </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_FE55F0284F93058976D95B84F278F8B5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_FE55F0284F93058976D95B84F278F8B5" xlink:to="lab_us-gaap_NonoperatingIncomeExpense_FE55F0284F93058976D95B84F278F8B5" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A03502BC152C803B21075B84F2794D0E_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A03502BC152C803B21075B84F2794D0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income (loss) before income taxes </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A03502BC152C803B21075B84F2794D0E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A03502BC152C803B21075B84F2794D0E" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A03502BC152C803B21075B84F2794D0E" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Net </link:label>
<link:label id="lab_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNet" xlink:label="loc_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89" xlink:to="lab_us-gaap_AccountsReceivableNet_330757519E46AA2F0E24DD2DB4E3BA89" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contracts with Customers, Asset, Gross, Current </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Asset, Gross, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerAssetGrossCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602" xlink:to="lab_us-gaap_ContractWithCustomerAssetGrossCurrent_CFFBC14393684610B456DD2DB4E44602" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D_periodStartLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Contract Liability Balance as of December 31, 2017 </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D" xlink:to="lab_us-gaap_ContractWithCustomerLiability_9C03CACF21CB4BAA51DBDD2DB4E49C7D" xlink:type="arc"/>
<link:label id="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_5717A65399C452CBDA8CDD2DB4E4B6C9_terseLabel_en-US" xlink:label="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_5717A65399C452CBDA8CDD2DB4E4B6C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cumulative effect adjustment from the implementation of ASC 606 </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease" xlink:label="loc_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_5717A65399C452CBDA8CDD2DB4E4B6C9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_5717A65399C452CBDA8CDD2DB4E4B6C9" xlink:to="lab_bwp_CurrentGasStoredUndergroundCumulativeEffectDecrease_5717A65399C452CBDA8CDD2DB4E4B6C9" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Revenues recognized that were included in the contract liability balance at the beginning of the period </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability, Revenue Recognized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_F0A88080E335BC421E12DD2DB4E42E76" xlink:type="arc"/>
<link:label id="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC_terseLabel_en-US" xlink:label="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increases due to cash received, excluding amounts recognized as revenues during the period </link:label>
<link:label id="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC_label_en-US" xlink:label="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract With Customer, Liability, Increase </link:label>
<link:label id="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC_documentation_en-US" xlink:label="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been previously received. </link:label>
<link:loc xlink:href="bwp-20181231.xsd#bwp_ContractWithCustomerLiabilityIncrease" xlink:label="loc_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:to="lab_bwp_ContractWithCustomerLiabilityIncrease_6453D9D65E9C842F7658DD2DB4E4A3DC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiability_FFBC7EA515C288B3439EDD2DB4E4BA5C_periodEndLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_FFBC7EA515C288B3439EDD2DB4E4BA5C" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Contract Liability Balance as of December 31, 2018 </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_FFBC7EA515C288B3439EDD2DB4E4BA5C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_FFBC7EA515C288B3439EDD2DB4E4BA5C" xlink:to="lab_us-gaap_ContractWithCustomerLiability_FFBC7EA515C288B3439EDD2DB4E4BA5C" xlink:type="arc"/>
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</link:linkbase>

16 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 5/06/24  Boardwalk Pipeline Partners, LP   10-Q        3/31/24   58:3.5M
 2/06/24  Boardwalk Pipeline Partners, LP   10-K       12/31/23  109:9.6M
10/30/23  Boardwalk Pipeline Partners, LP   10-Q        9/30/23   58:3.8M
 7/31/23  Boardwalk Pipeline Partners, LP   10-Q        6/30/23   51:3.4M
 5/01/23  Boardwalk Pipeline Partners, LP   10-Q        3/31/23   51:3.3M
 2/07/23  Boardwalk Pipeline Partners, LP   10-K       12/31/22   95:10M
10/31/22  Boardwalk Pipeline Partners, LP   10-Q        9/30/22   52:3.9M
 8/01/22  Boardwalk Pipeline Partners, LP   10-Q        6/30/22   50:3.8M
 5/02/22  Boardwalk Pipeline Partners, LP   10-Q        3/31/22   50:3.4M
 2/08/22  Boardwalk Pipeline Partners, LP   10-K       12/31/21   94:10M
11/01/21  Boardwalk Pipeline Partners, LP   10-Q        9/30/21   50:3.7M
 8/02/21  Boardwalk Pipeline Partners, LP   10-Q        6/30/21   48:3.6M
 5/03/21  Boardwalk Pipeline Partners, LP   10-Q        3/31/21   48:3.1M
 2/09/21  Boardwalk Pipeline Partners, LP   10-K       12/31/20   96:10M
11/02/20  Boardwalk Pipeline Partners, LP   10-Q        9/30/20   51:3.9M
 8/03/20  Boardwalk Pipeline Partners, LP   10-Q        6/30/20   50:4.2M
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