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Plumbing in Washington (WA)

Explore 1,138 verified plumbing across Washington counties and municipalities. All credential records are sourced from the Washington State Department of Labor & Industries (WA L&I) under Revised Code of Washington RCW 18.27 (Contractor Registration), RCW 19.28 (Electrical EL01–EL06), and RCW 18.106 (Plumbing PL01/PL02) with zero lead selling or paid ranking.

Official State Licensing Portal: Washington State Department of Labor & Industries (WA L&I) Official Portal

Counties in Washington (22)

Explore regional county hubs and their underlying municipalities:

Open Municipalities in Washington (60)

Seattle 73Spokane 52Tacoma 51Vancouver 50Puyallup 30Lynnwood 25Kent 23Auburn 22Everett 22Olympia 19Battle Ground 18Spokane Valley 18Snohomish 17Bellingham 16Kennewick 16Arlington 15Woodinville 15Kirkland 14Renton 14Bremerton 13Marysville 13Bellevue 12Burien 12Port Orchard 12Walla Walla 12Wenatchee 12Yakima 12Mount Vernon 11Bonney Lake 10Bothell 10Gig Harbor 9Lacey 9Lake Stevens 9Longview 9Pasco 9Port Angeles 9Redmond 9Tukwila 9Edmonds 8Federal Way 8Maple Valley 8Poulsbo 8Richland 8Shoreline 8Deer Park 7East Wenatchee 7Mountlake Terrace 7Oak Harbor 7Sedro Woolley 7Sequim 7Shelton 7Woodland 7Yacolt 7Buckley 6Graham 6Greenacres 6Moses Lake 6Nine Mile Falls 6North Bend 6Anacortes 5

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
Prepare a project brief

Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.