Licensed Plumbers in Washington
Find Washington Labor & Industries licensed plumbing contractors. Experts in rainy climate, seismic codes, and Evergreen State challenges.
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District Capital Services LLC
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Roto-Rooter Plumbing & Water Cleanup
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Magnolia Plumbing, Heating & Cooling
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Haynes Plumbing
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Plumber In DC
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Spartan Plumbing, Heating and Air Conditioning
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#1 DMV Plumbing
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Fry Plumbing, Heating And Air Conditioning Corp.
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Plumb Right Plumbing
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Plumbing Force One LLC
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Quality Plumbing Services Washington DC
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R&G Plumbing Services LLC
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Brant Plumbing Pros
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Abbott's Plumbing
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Plumbline Plumbers & Mechanical LLC
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JD plumbing of DC
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Michael & Son Services
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Len The Plumber Heating & Air, LLC
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District Plumbers
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Tim Whistler Plumbing, Gas Fitting, HVAC, and Electrical
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Mayco Andrade Plumbing
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Grayton Plumbing
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Exclusive Plumbing, LLC
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A H Jordan Plumbing & Mechanical
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H.D. Johnson
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Nelson Plumbing and Construction, LLC
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Warner Super Service
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Mike Adairs Plumbing
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Bestway Plumbing and Drain LLC
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Durance Plumbing
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Iconic Plumbing Llc
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Community Plumbing & Heating
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Service Force Plumbing
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John Nugent & Sons
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Reddick & Sons, Inc
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Ferguson Plumbing Supply
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Brian B. Quick Plumbing
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MoCo Plumbing, LLC
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Full Service Plumbing Pros
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Sam & Sons Services
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Pipe Dreams Plumbing & Heating Inc
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Gods Workers
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Chandler's Plumbing & Heating
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Mega Plumbing Corp
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Sigma Plumbing Mechanical Contractors LLC
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Seidel Plumbing & Heating Co
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Plumbing Pipe Advocate
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Washington Home Doctors, Inc. Brentwood, MD
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Kramer & Sons Plumbing Services, Inc
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O'Connor Plumbing
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Heil Plumbing
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DB's Plumbing and DrainĀ®
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Arlington Plumbing Heating and Cooling
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W. L. Gary Company, Inc.
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Staton Heating, Cooling & Plumbing
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EJF Maintenance Services
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All State Plumbing Heating & Cooling
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Len The Plumber Heating & Air, LLC
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Prince William Plumbing
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Direct Plumbing & Drain Services
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Thomas E Clark Inc
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Carson Plumbing
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F.H. Furr Plumbing, Heating, Air Conditioning & Electrical
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Disclaimer: Always verify licensing, insurance, and references before hiring any contractor.
Finding Quality Plumbers in Washington
Washington's Department of Labor and Industries (L&I) oversees plumbing licensure. Legislative changes created new plumbing contractor licenses requiring designated certified plumbers for companies. The Evergreen State's rainy climate, seismic activity, and environmental consciousness create unique plumbing demands.
Licensing and Regulations
Washington requires plumbing contractors to designate certified plumbers as dedicated plumbers for their companies, maintain continuous plumbing contractor surety bonds of $6,000 or assignments of savings, and purchase general liability insurance covering $50,000 for injury or property damages, $100,000 for injury or death to one person, and $200,000 for injury or death to multiple persons. Trainee plumber certificates require applicants be at least 16 years old with $36 fees, renewing with proof of eight hours continuing education including four hours plumbing codes and four hours industry practices or safety. Journey level certification requires no less than 8,000 hours experience over four years under licensed journey level plumbers with at least two years in commercial or industrial installations, minimum 16 hours classroom training, and passing journey level exams with at least 70%. Specialty licenses include residential (6,000 hours over three years), pump and irrigation (4,000 hours over two years plus electrical certification for pumps exceeding 100 gallons per minute), domestic well (2,000 hours over one year), and backflow requiring active Backflow Assembly Tester certification from Washington State Department of Health. Washington has reciprocity only with Idaho.
Washington-Specific Plumbing Challenges
Washington's rainy climate brings heavy stormwater that fills combined sewer systems in older Seattle areas, causing combined sewer overflow releases mixing stormwater and sewage during heavy storms that are increasingly frequent due to climate change. The Puget Sound Region ranks among the nation's most seismically active, with the 1949, 1965, and 2001 earthquakes leading to approximately $100 million in water system seismic upgrades requiring earthquake-resistant installations and flexible pipe connections. Stormwater runoff threatens urban waters throughout the state. King County working with Seattle decreased CSO by approximately 1.5 billion gallons implementing treatment stations handling up to 70 million gallons of combined rain and wastewater daily. Coastal areas face saltwater corrosion. The state's environmental regulations affect fixture selection and equipment disposal. Seattle, Tacoma, and Spokane face aging infrastructure alongside modern green building requirements. Mountain regions require freeze protection.
Find Trusted Contractors
Washington's L&I-licensed contractors understand Evergreen State challenges from seismic codes to stormwater management. These certified professionals bring expertise in earthquake-resistant installations, combined sewer overflow mitigation, environmental compliance, and the diverse conditions throughout Washington from Seattle to Spokane.
Major cities covered: Alexandria, Annapolis, Arlington, Beltsville, Chantilly, Elkridge, Falls Church, Fort Washington, and 17 more.
Browse Plumber Directories by City in Washington
Explore detailed plumber listings for specific cities in Washington