22 of King County's 702 plumbers and heating and cooling contractors are listed for sewer line work.
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A contractor is listed for a service when its owner picked the service, when its Google Business Profile category names it, or when its business name does. Ranked as on the county page: verified owner, then a Google rating of 4.0 or higher, then review count, then fleet size. How ranking works
Ranges are national; ask contractors near you.
Figures checked September 2026.
Washington licenses plumbing contractors and certifies plumbers through its Department of Labor and Industries.1, 2 Heating and cooling contractors in Washington register as specialty contractors rather than holding a competency license.1, 2 Your local building department in Washington can tell you whether replacing a water heater, furnace or AC needs a permit.
