| 01-CB-09353-001 | Plumbers & Pipefitters, Local 51 | Hiring Halls |
| 01-CB-10725-001 | United Association of Journeymen and Apprentices of the Plumbing & Pipefitting Industry of the United States & Canada, Local 104, AFL-CIO, CLC (Tucker Mechanical) | Hiring Halls |
| 02-CB-17741-001 | United Association of Plumbers & Steamfitters Local Union No. 21 (Various) | Hiring Halls |
| 03-CB-07979-001 | Plumbers and Steamfitters Local 267 (Nicholson and Hall) | Hiring Halls |
| 03-CB-08206-001 | Local Union No. 773, United Association of Plumbers, Pipefitters & Steamfitters, AFL-CIO (Peter Rozell Mechanical) | Hiring Halls |
| 03-CB-08783-001 | Plumbers Local 773 (Various) | Hiring Halls |
| 03-CB-08805-001 | Plumbers and Plumbfitters Local 773 (Bulman Plumbing & Heating, Inc.) | Hiring Halls |
| 04-CB-08950-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry, Local 322 (No Employer) | Hiring Halls |
| 04-CB-08996-001 | United Association of Journeymen and Apprentices of the Plumbing & Pipefitting Industry of the U.S. & Canada, AFL-CIO, Local 322 (United Association of Journeymen and Apprintices of the Plumbing & Pipefitting Industry of the U.S. & Canada, AFL-CIO, Local | Hiring Halls |
| 04-CB-09171-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, AFL-CIO, Local 322 ((No Employer)) | Hiring Halls |
| 04-CB-09237-001 | United Association of Journeymen & Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, AFL-CIO, Local 322 ((No Employer)) | Hiring Halls |
| 04-CB-09239-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the U.S. & Canada, AFL-CIO Local 524 (Mechanical Contractors of Northeastern PA Inc.) and H.T. Lyons | Hiring Halls |
| 04-CB-09364-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada Local 520 (No Employer) | Hiring Halls |
| 05-CB-09108-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, Local 74, AFL-CIO (I.D. Griffith) | Hiring Halls |
| 05-CB-09389-001 | Plumbers Local 74 (Esquire Plumbing and Heating) | Hiring Halls |
| 06-CB-10429-001 | Plumbing and Pipe Fitting Industry of the United States and Canada, Plumbers and Steamfitters Local 83, AFL-CIO (Various Employers) | Hiring Halls |
| 06-CB-10684-001 | United Association of Journeyman and Apprentices of the Plumbing and Pipe Fitting Industry of the U. S. and Canada, Steamfitters Local 449, AFL-CIO (Pleasant Hills Construction Co. Inc.) | Hiring Halls |
| 07-CB-12342-001 | Local 357, Plumber & Pipefitters (No Employer) | Hiring Halls |
| 07-CB-12757-001 | U.A. of Pipefitters & Plumbers & App. of the U.sS & Canada & Local 636 (RMF) | Hiring Halls |
| 07-CB-12841-001 | Local 636 Pipefitters (Metropolitan Detroit Plumbing & Mech. Contractors Assoc. Inc., Plumbing & Heating Ind. of Detroi) | Hiring Halls |
| 07-CB-14610-001 | Local 174, West Michigan Plumbers and Pipe Fitters and Service Trades, U.A. (No Employer) | Hiring Halls |
| 07-CB-14682-001 | Local 636 Pipefitters (I.P.S.) | Hiring Halls |
| 07-CB-14723-001 | Local 636 Pipefitters (Pioneer Contracting Services, Inc.) | Hiring Halls |
| 07-CB-15264-001 | Local 174, United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, AFL-CIO (No Employer) | Hiring Halls |
| 07-CB-16016-001 | United Assoc. of Journeymen & Apprentices of the Plumbing & Pipefitting Ind. of the U.S. & CanadaLocal 85 (Johnny Green, Inc.) | Hiring Halls |
| 07-CB-16151-001 | Local 85 Plumbers & Pipefitters (Faulkner Const. Co.) | Hiring Halls |
| 08-CB-09952-001 | Plumbers and Pipefitter, Local Union 396 (Piping Solutions Inc.) | Hiring Halls |
| 08-CB-09953-001 | Plumbers and Pipefitter, Local Union 396 (Metro Piping) | Hiring Halls |
| 09-CB-10040-001 | UNITED ASSOCIATION OF JOURNEYMEN AND APPRENTICES OF THE PLUMBING AND PIPEFITTING INDUSTRY OF THE UNITED STATES AND CANADA, LOCAL 392, AFL-CIO (Geiler Plumbing) | Hiring Halls |
| 09-CB-10077-001 | LOCAL 521, THE PLUMBERS, PIPEFITTERS AND SPRINKLERFITTERS UNION (Williams Plumbing) | Hiring Halls |
| 09-CB-10089-001 | UNITED ASSOCIATION OF PLUMBERS, PIPE FITTERS & MECHANICAL EQUIPMENT SERVICE, LOCAL UNION NO. 392-59 (Geiler Company) | Hiring Halls |
| 09-CB-10245-001 | PLUMBERS, PIPE FITTERS AND MECHANICAL EQUIPMENT SERVICE, LOCAL UNION 392 (T.J. Dyer Co.) | Hiring Halls |
| 09-CB-10303-001 | PLUMBERS LOCAL 392 (T.J.Dyer Co.) | Hiring Halls |
| 09-CB-10313-001 | PLUMBERS LOCAL 392 (Satellite Plumbing) | Hiring Halls |
| 09-CB-10335-001 | PLUMBERS AND PIPEFITTERS, LOCAL 625 (Employer: None) | Hiring Halls |
| 09-CB-10409-001 | PLUMBERS, PIPEFITTERS & MECHANICAL EQUIPMENT SERVICE, LOCAL UNION #392 (No Employer) | Hiring Halls |
| 09-CB-10486-001 | PLUMBERS & PIPEFITTERS LOCAL 392 (Nelson Stark Plumbing) | Hiring Halls |
| 09-CB-10667-001 | PLUMBERS LOCAL 392 (McGraw-Kokosing) | Hiring Halls |
| 09-CB-11286-001 | PLUMBERS AND PIPEFITTERS, LOCAL 189 (Farber Corporation) | Hiring Halls |
| 09-CB-11311-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada Local 189, AFL-CIO(General Temperature Control) | Hiring Halls |
| 09-CB-12029-001 | Ohio State Association of Plumbers and Pipefitters (Gallagar Brothers) | Hiring Halls |
| 09-CB-12048-001 | Plumbers, Pipefitters & Mechanical Equipment Service Local Union 392 (no employer) | Hiring Halls |
| 09-CB-12060-001 | United Association of Journeymen & Apprentices Plumbing & Pipe Fitting Industry of the United States & Canada Plumbers & Steam Fitters Local 502 (Becon/Bechtel) | Hiring Halls |
| 09-CB-12091-001 | United Association of Journeymen and Apprentices of the Plumbing & Pipe Fitting Industry Local 502(Becon/Bechtel) | Hiring Halls |
| 10-CB-08325-001 | Plumbers and Pipefitters Local 760 (Wise Alloys) | Hiring Halls |
| 10-CB-08834-001 | United Association of Journeymen and Apprentices of the Plumbing and Steamfitting Trade Local 91 (McAbee Construction) | Hiring Halls |
| 11-CB-02966-001 | Plumbers and Steamfitters, Local 491 (Riggs Distler) | Hiring Halls |
| 11-CB-03007-001 | Plumbers, Steamfitters, Local Union 491 (Connex Pipe Systems) | Hiring Halls |
| 11-CB-03304-001 | Plumbers and Pipefitters Local Union 421 (B.F. Shaw) | Hiring Halls |
| 12-CB-04474-001 | Air Conditioning and Refrigeration Pipefitters Local Union 725 (Goss Graphic Systems, Inc.) | Hiring Halls |
| 12-CB-04561-001 | Air Conditioning and Refrigeration Pipefitters, Local Union 725 (No Employer) | Hiring Halls |
| 12-CB-04723-001 | PIPEFITTERS LOCAL 725 (VARIOUS EMPLOYERS) | Hiring Halls |
| 13-CB-17835-001 | United Association of Plumber& Pipefitters and its Chicago Local 597 (Various) | Hiring Halls |
| 13-CB-17902-001 | Pipe Fitter's Association, Local Union 597 (Morrison) | Hiring Halls |
| 14-CB-09841-001 | Local 553 Pipefitters (Various) | Hiring Halls |
| 14-CB-09876-001 | Plumbers and Pipefitters Local Union Number 553, United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States & Canada, AFL-CIO (G.R.P. Mechanical Company, Inc., and other employers) | Hiring Halls |
| 14-CB-09900-001 | Plumbers and Pipefitters Local 551 (various) | Hiring Halls |
| 14-CB-10169-001 | United Association of Pipefitters Local No. 562 (Corrigan Company and various other Employers) | Hiring Halls |
| 15-CB-04995-001 | PLUMBERS & STEAMFITTERS LOAL 198 (SHEEHAN PIPELINE CONSTRUCTION COMPANY) | Hiring Halls |
| 15-CB-05021-001 | United Association of Journeymen and Apprentices of the Plumbing, Pipefitting, Sprinkler Fitting Industry of the Unites States and Canada (No Employer) | Hiring Halls |
| 15-CB-05346-001 | United Association of Plumbers and Pipefitters of the United States an dcanada, Local union No. 714, AFL-CIO, CLC (American Air) | Hiring Halls |
| 16-CB-05669-001 | United Association of Plumbers and Pipefitters, Local 237 (Cobar Industries) | Hiring Halls |
| 16-CB-05727-001 | Plumbers Union, Local 100 | Hiring Halls |
| 16-CB-06452-001 | Plumber & Pipefitters, Local 146 (Plumber & Pipefiters, Local 146) | Hiring Halls |
| 16-CB-06525-001 | Plumbers and Pipefitters, Local 146 (Brantd, Inc.) | Hiring Halls |
| 16-CB-06540-001 | Plumbers & Steamfitters Local Union 146 (No Employer) | Hiring Halls |
| 17-CB-05409-001 | Plumbers and Pipefitters Local Union No. 344 (Wattie Wolfe, Inc.) | Hiring Halls |
| 17-CB-05508-001 | Plumbers and Pipefitters Local 430 (No Employer) | Hiring Halls |
| 17-CB-05942-001 | Pipefitters Local 344 (No Employer) | Hiring Halls |
| 17-CB-06062-001 | Plumbers and Pipefitters Local 344 (No Employer) | Hiring Halls |
| 17-CB-06442-001 | Pipeliners Local Union 798 (No Employer) | Hiring Halls |
| 18-CB-04223-001 | Pipefitters Local 455 (No Employer) | Hiring Halls |
| 18-CB-04427-001 | Plumbers and Steamfitters Local 33 (Quality Plumbing Company) | Hiring Halls |
| 18-CB-04741-001 | Pipefitters Local 539 (Mechanical Solutions) | Hiring Halls |
| 19-CB-08428-001 | Plumbers Local 367 (CRL Services) | Hiring Halls |
| 19-CB-08445-001 | Pipefitters Local 82 (Kamyr Const.) | Hiring Halls |
| 19-CB-08468-001 | Plumbers & Pipe Fitters Local 367 (Lewis Mechanical) | Hiring Halls |
| 19-CB-08488-001 | Plumbers & Pipefitters Local 44 (AAA Plumbing and Drain) | Hiring Halls |
| 19-CB-08516-001 | Plumbing and Pipefitting Industry, Local 82 (No Employer) | Hiring Halls |
| 19-CB-08621-001 | Plumbers Local 82 (No Employer) | Hiring Halls |
| 19-CB-08672-001 | Plumbers & Pipefitters Local 32 ((Pilchuck Mechanical Inc.) | Hiring Halls |
| 19-CB-08790-001 | Plumbers & Steamfitters Local 82 (Pacific Mechanical) | Hiring Halls |
| 19-CB-08806-001 | Plumbers Local 32 (Tomahawk Mechanical) | Hiring Halls |
| 19-CB-08884-001 | Plumbers and Pipe Fitters Local Union No. 32 | Hiring Halls |
| 19-CB-08885-001 | Plumbing & Pipefitting Journeyman & Apprenticeship Trng Committee | Hiring Halls |
| 19-CB-09181-001 | Plumbers and Pipefitters Local 32 (Anthony Mechanical) | Hiring Halls |
| 19-CB-09192-001 | Plumbers and Steamfitters Local 598 (No Employer) | Hiring Halls |
| 19-CB-09417-001 | Plumbers & Pipefitters Local 32 (Hussmann Corporation) | Hiring Halls |
| 19-CB-09725-001 | Plumbers and Pipefitters local 32 (No Employer) | Hiring Halls |
| 20-CB-11815-001 | United Association of Plumbers, Pipefitters, Steamfiters and Sprinklerfitters Local 228 (Various) | Hiring Halls |
| 20-CB-12033-001 | Local 228, Plumbers & Pipefitters Union (Various) | Hiring Halls |
| 20-CB-12243-001 | Plumbers and Steamfitters Union Local 228 (Lawson Mechanical) | Hiring Halls |
| 20-CB-12696-001 | Plumbers and Steamfitters Union, Local 228 (No Employer) | Hiring Halls |
| 21-CB-13506-001 | United Association of Journeyman & Apprentices of the Plumbing & Pipefitting Industry of the United States and Canada, Local 230, AFL-CIO ((No Employer Named)) | Hiring Halls |
| 22-CB-09317-001 | Plumbers' Local Union No.24 (No Employer) | Hiring Halls |
| 25-CB-08760-001 | UA PLUMBER & PIPEFITTERS, LOCAL 157 (ENERFAB) | Hiring Halls |
| 26-CB-04122-001 | Plumbers and Pipefitters Local 572 (U S Engineering) | Hiring Halls |
| 27-CB-04117-001 | Plumbers & Pipefitters, Local 192 (Total Plumbing) | Hiring Halls |
| 27-CB-04208-001 | Plumbers & Steamfitters Union, Local #648 (Fullman Kinectics) | Hiring Halls |
| 27-CB-04380-001 | Plumbers and Pipefitters, Local 192 (No Employer) | Hiring Halls |
| 27-CB-04488-001 | UA Road Sprinkler Fitters Local 669 (MDM) | Hiring Halls |
| 27-CB-05037-001 | Plumbers, Local 3 (No Employer) | Hiring Halls |
| 27-CB-05041-001 | Plumbers and Pipefitters Local 192 (No Employer) | Hiring Halls |
| 27-CB-05055-001 | Plumbers Local 3 | Hiring Halls |
| 28-CB-05523-001 | Local 469, United Association of Journeymen & Apprentices of the Plumbing & Pipe Fitting Industry of the United States and Canada (no specific employer) | Hiring Halls |
| 28-CB-05769-001 | Plumbers and Steamfitters, Local Union No. 412, AFL-CIO (Yearout Mechanical and Engineering, Inc.) | Hiring Halls |
| 28-CB-05796-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, Local Union No. 412, AFL-CIO (No Employer) | Hiring Halls |
| 28-CB-05996-001 | Plumbers and Steam Fitters Local No. 412, United Association of Journeymen and Apprentices of the United States and Canada, AFL-CIO (Yearout Mechanical & Engineering, Inc.) | Hiring Halls |
| 28-CB-06260-001 | Plumbers & Pipefitters Local 525 (No Employer Named) | Hiring Halls |
| 29-CB-12513-001 | Local 1 Plumbers Union (Various) | Hiring Halls |
| 30-CB-04434-001 | Steamfitters and Plumbers Local 400 (No Employer) | Hiring Halls |
| 30-CB-04546-001 | Steamfitters Local 601, AFL-CIO (Integrated CE Services, Inc.) | Hiring Halls |
| 30-CB-04853-001 | Steamfitters Local 601 (Hiring Hall) | Hiring Halls |
| 30-CB-04999-001 | Plumbers and Steamfitters Local 434 (McCain Foods USA, Inc.) | Hiring Halls |
| 30-CB-05064-001 | Plumbers & Steamfitters, Local 118 (Washington Group) | Hiring Halls |
| 31-CB-10553-001 | Plumbers & Pipefitters, Local 250 (Commerce Air Conditioning Systems) | Hiring Halls |
| 31-CB-10596-001 | Plumbers Union Local 78 (No Employer) | Hiring Halls |
| 31-CB-10650-001 | United Assn. of Plumbers & Pipe-fitters, Local 460 (Cout's Heating) | Hiring Halls |
| 31-CB-11377-001 | Plumbers & Pipefitters, Local 409 (Air Control Balancing, Inc.) | Hiring Halls |
| 31-CB-11415-001 | Plumbers & Pipe Fitters Local 409 (Marelich Mechanical Co./Inc.) | Hiring Halls |
| 31-CB-11420-001 | Plumbers and Pipefitters, Local 460 (ARB Incorporated) | Hiring Halls |
| 31-CB-11421-001 | Plumbers and Pipefitters, Local 460 (ARB Incorporated) | Hiring Halls |
| 31-CB-11426-001 | Pipefitters Local 409 (A.R.B. Inc.) | Hiring Halls |
| 31-CB-11444-001 | Plumbers & Pipefitters, Local 409 (NEN) | Hiring Halls |
| 31-CB-11457-001 | Plumbers & Steamfitters, Local 409 (No Employer) | Hiring Halls |
| 31-CB-11476-001 | Plumbers & Pipefitters Local 409 ((No Employer Named)) | Hiring Halls |
| 31-CB-11602-001 | Plumbers & Pipe Fitters, Local 409 (ARB, Inc.) | Hiring Halls |
| 31-CB-11750-001 | Plumbers and Pipefitters Local 409 (No Employer) | Hiring Halls |
| 32-CB-04435-001 | Steamfitters Local Union No. 342 of the United Assn. of Journeymen and Apprentices of the Plumbing & Pipefitting Industry of the U.S. & Canada (Contra Costa Electric, Inc.) | Hiring Halls |
| 32-CB-05196-001 | Plumbers & Steamfitters Local Union 342 (Contra Costa Electric) | Hiring Halls |
| 32-CB-05538-001 | United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada, Local No. 393, AFL-CIO (marelich Mechanical) | Hiring Halls |
| 32-CB-05599-001 | Plumbers and Steamfitters Local 343 (Marliech Mechanical) | Hiring Halls |
| 32-CB-05980-001 | United Association of Plumbers and Steamfitters Union, Local 342 (ACCO Engineering Systems) | Hiring Halls |
| 32-CB-06008-001 | United Association of Plumbers and Steamfitters Union, Local #342 (ACCO Engineered Systems) | Hiring Halls |
| 32-CB-06211-001 | Plumbers & Steamfitters Union, Local 393 (Berkeley Engineering Co.) | Hiring Halls |
| 33-CB-03856-001 | Steamfitters, Local 353 (No Employer) | Hiring Halls |
| 33-CB-03940-001 | Plumbers and Pipefitters Union, Local 99 (Newberg Stone) | Hiring Halls |
| 33-CB-04041-001 | United Association of Plumbers Pipefitters Local 99 (Various) | Hiring Halls |
| 34-CB-02872-001 | PLUMBERS LOCAL 777 (Day & Zimmerman, NPS, Inc.) | Hiring Halls |
| 36-CB-02311-001 | Plumbers and Steamfitters Local #290 | Hiring Halls |
| 36-CB-02314-001 | Plumbers and Steamfitters Local #290 (Fullman Company) | Hiring Halls |
| 36-CB-02371-001 | United Association of Plumbers & Steamfitters Local #290 (Fullman Kinetics) | Hiring Halls |
| 36-CB-02437-001 | Plumbers and Steamfitters, Local 290 (Plumbing and Mechanical Contractors Assn.) | Hiring Halls |
| 36-CB-02456-001 | Plumbers and Pipefitters Local 290 (Kinetic Systems, Inc.) | Hiring Halls |
| 36-CB-02463-001 | Plumbing and Pipe Fitting Industry, Local 290 (Harder Mechanical) | Hiring Halls |
| 36-CB-02530-001 | Local #290 of the United Association of Plumbers and Steamfitters (DeTemple Company Inc.) | Hiring Halls |
| 36-CB-02538-001 | Plumbers Local No. 290 (Plumbing & Mechanical Contractors Association) | Hiring Halls |
| 36-CB-02553-001 | Local 290 of the United Association of Plumbers and Steamfitters (DeTemple Company Inc.) | Hiring Halls |
| 36-CB-02554-001 | Plumbers and Pipefitters, Local 290 | Hiring Halls |
| 36-CB-02559-001 | Plumbers and Pipefitters Local 290 | Hiring Halls |
| 36-CB-02570-001 | Plumbers and Pipefitters, Local 290 | Hiring Halls |
| 36-CB-02678-001 | Plumbers and Steamfitters Local 290 | Hiring Halls |
| 37-CB-01555-001 | United Association of Plumbing and Pipe Fitting and Industry of the United States and Canada, Local 675, AFL-CIO (Various Employers) | Hiring Halls |
| 37-CB-01719-001 | Plumbing & Pipe Fitting Union, Local 675 (Southland Industries) | Hiring Halls |
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