Plumbing contractors in Washington
2,266 active plumbing contractors are registered with Washington L&I. 4,450 registrations are on record in all, including expired and other statuses.
200 of the active plumbing contractors registered in Washington are based in other states.
All 4,450 registrations on record
Businesses by registered name and license number. Show only the 2,266 active registrations.
- MAPLE VALLEY PLBG & PIWRKS INCRE-LICENSED
Ravensdale, WA · License MAPLEVP022BM · First registered 1998
- MAPLE VALLEY PLBG & PIWRKS INCSUPERCEDED
Ravensdale, WA · License MAPLEVP791O1 · First registered 2021
- MAPLE VALLEY PLUMBING LLCEXPIRED
Maple Valley, WA · License MAPLEVP831RJ · First registered 2017
- MARATHON PLUMBINGRE-LICENSED
Fall City, WA · License MARATP*101OM · First registered 1990
- MARATHON PLUMBING LLCRE-LICENSED
Fall City, WA · License MARATPL814LD · First registered 2019
Lynnwood, WA · License MARCEGC780L2 · First registered 2022
- MARK THE PLUMBEREXPIRED
Snohomish, WA · License MARKPP*897CR · First registered 2011
- MARK'S PLUMBING LLCRE-LICENSED
Omak, WA · License MARKSPL942O1 · First registered 2006
- MARR'S HEATING & A/C INCSUSPENDED
Bellingham, WA · License MARRSHC767P1 · First registered 2024
- MARSHAL WATERWORKS LLCEXPIRED
Lakewood, WA · License MARSHWL864C4 · First registered 2014
- MARTHA'S PLUMBING SERVICE LLCSUPERCEDED
Seattle, WA · License MARTHPS770JR · First registered 2023
- MARYANSKI PLUMBING LLCSUSPENDED
Ravensdale, WA · License MARYAPL798M9 · First registered 2021
- MARYANSKI PLUMBING LLCRE-LICENSED
Ravensdale, WA · License MARYAPL833B3 · First registered 2017
- MARYSVILLE PLUMBING INCEXPIRED
Arlington, WA · License MARYSPI101JE · First registered 1990
- MASHTARE PLUMBINGEXPIRED
Spokane, WA · License MASHTP*941C4 · First registered 2006
- MATHER & SONS PUMP SERVICE INCSUPERCEDED
Vancouver, WA · License MATHESP793O9 · First registered 2021
- MATHER/SONS PUMP SERV INCRE-LICENSED
Vancouver, WA · License MATHESP287CW · First registered 1972
- MATRIX SERVICE INCEXPIRED
Tulsa, OK · License MATRISI797PR · First registered 2021
- MATT THE PLUMBEREXPIRED
Tacoma, WA · License MATTPP*894DD · First registered 2011
- MATT'S PLUMBING LLCRE-LICENSED
Cle Elum, WA · License MATTSPL860KT · First registered 2014
- MATTS RESIDENTIAL PLUMBING LLCRE-LICENSED
Richland, WA · License MATTSRP863NA · First registered 2014
- MAULDIN'S WELL SERVICE INCSUPERCEDED
Friday Harbor, WA · License MAULDWS792OB · First registered 2021
- MAVEN MECHANICALEXPIRED
La Center, WA · License MAVENM*792B8 · First registered 2021
- MAXGASRE-LICENSED
Kent, WA · License MAXGA**842LA · First registered 2016
- MB PLUMBINGEXPIRED
Bothell, WA · License MBPLUP*822DZ · First registered 2018
- MB PLUMBINGEXPIRED
Camano Island, WA · License MBPLUP*908DS · First registered 2010
- MC MECHANICAL LLCEXPIRED
Kennewick, WA · License MCMECML775CF · First registered 2023
- MC MECHANICAL LLCSUSPENDED
Kennewick, WA · License MCMECML775JD · First registered 2023
- MC PIPEMASTERS LLCEXPIRED
Gig Harbor, WA · License MCPIPPL881M3 · First registered 2012
- MCAULIFFE PLUMBINGOUT OF BUSINESS
Monroe, WA · License MCAULP*797RF · First registered 2021
- MCCOY PLUMBING & HEATING INCRE-LICENSED
Moscow, ID · License MCCOYPH036KK · First registered 1997
- MCDONALD PLUMBING LLCOUT OF BUSINESS
Seattle, WA · License MCDONPL025PT · First registered 1998
Pasco, WA · License MCKCOCR762B3 · First registered 2024
- MCKINNON PLUMBING INCSUSPENDED
Bellingham, WA · License MCKINPI761PH · First registered 2024
- MCLANE PLUMBING & CONST INCRE-LICENSED
Central Point, OR · License MCLANPC833DH · First registered 2017
Seattle, WA · License MCLAUPB963JE · First registered 2004
- MCLENDON HOME SERVICESEXPIRED
Tukwila, WA · License MCLENHS792CJ · First registered 2021
- MCLEOD CONSTRUCTION LLCEXPIRED
Lynnwood, WA · License MCLEOCL785D3 · First registered 2022
- MCM PLUMBING LLCEXPIRED
Hayden, ID · License MCMPLPL819NF · First registered 2019
- MECHANIX INCEXPIRED
Hermiston, OR · License MECHAI*221ND · First registered 1978
- MEL'S PLUMBING SERVICESSUSPENDED
Goldendale, WA · License MELSPPS750DD · First registered 2025
- MEL'S PLUMBING SERVICESEXPIRED
Pasco, WA · License MELSPPS841BN · First registered 2016
- MELBYE'S PLUMBINGRE-LICENSED
Moses Lake, WA · License MELBYP*161J3 · First registered 1984
- MELBYE'S PLUMBING LLCEXPIRED
Moses Lake, WA · License MELBYPL797OP · First registered 2021
- MELBYE'S PLUMBING LLCRE-LICENSED
Moses Lake, WA · License MELBYPL800CG · First registered 2020
- MERCER ISLAND PLUMBING INCOUT OF BUSINESS
Maple Valley, WA · License MERCEIP044QQ · First registered 1996
- MERCER PLUMBINGOUT OF BUSINESS
McCleary, WA · License MERCEP*909MA · First registered 2010
- MERIT PLUMBINGEXPIRED
Tacoma, WA · License MERITP*805PN · First registered 2020
- MERRIMAN PLUMBING LLCRE-LICENSED
Battle Ground, WA · License MERRIPL984KW · First registered 2002
- MESA ENERGY SYSTEMS INCSUSPENDED
Irvine, CA · License MESAEES752DK · First registered 2025