8 of San Mateo County's 554 plumbers and heating and cooling contractors are listed for water heater 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.
California's Contractors State License Board issues the C-36 license plumbing businesses hold.1, 2, 3 Heating and cooling businesses in California hold the board's C-20 license.4 Your local building department in California can tell you whether replacing a water heater, furnace or AC needs a permit.
