Directory
Agencies, labs and local businesses for water. Listings, not recommendations. Checked Oct 12, 2026.
We have not hired these businesses or checked their work. Look up a contractor's license on the state board's site before you hire. No ratings, no ranking, nothing paid.
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Agencies and labs
- City of Petaluma WaterPetalumaConservation, groundwater, water quality and supply planning.
- Gold Ridge Resource Conservation DistrictWestern Sonoma CountyFree, confidential help with land, water and soil.
- North Coast Regional Water Quality Control BoardRegionalRegulates discharges that reach local rivers and creeks.
- Permit Sonoma, Well and Septic DivisionSanta Rosa area (707) 565-2849Well and septic permits and graywater systems.
- Russian River Watershed AssociationRegionalEleven local governments and districts working on water quality and fish habitat.
- Sonoma County Environmental Health, Well Water TestingCountywideThe county's suggested testing schedule for private wells.
- Sonoma County Public Health LaboratorySanta Rosa (707) 565-4711Bacteria tests for well water. Bottles at 3313 Chanate Road. Drop off Monday to Thursday, 8am to 4pm.
- Sonoma Resource Conservation DistrictCountywideWorks with farms, cities and rural communities on watersheds and conservation.
- Sonoma WaterSanta Rosa (707) 547-1900County water agency. Russian River supply, flood control, stormwater.
- State accredited lab map (ELAP)StatewideMap of labs accredited by the State Water Board.
- State Water Board, Drinking Water ProgramStatewideRegulates public water systems. Accredits labs.
Groups and education
- Daily ActsPetalumaCommunity workshops on rain gardens, swales and water-wise landscapes.
- Occidental Arts and Ecology Center, WATER InstituteOccidentalWatershed education, training and advocacy. Home of slow it, spread it, sink it.
Testing labs
- Alpha Analytical LaboratoriesPetaluma (707) 769-3128State accredited lab. On the county's list for private well testing.
- Brelje and Race LaboratoriesSanta Rosa (707) 544-8807State accredited lab. On the county's list for private well testing.
- Caltest Analytical LaboratoryNapa (707) 258-4000State accredited lab. On the county's list for private well testing.
- K PrimeSanta Rosa (707) 527-7574State accredited lab. On the county's list for private well testing.
Wells and pumps
- Jack Sissel Pump & Well ServiceSebastopolWell and pump service.
- Jerry & Don's Yager Pump-WellPetalumaWell and pump service.
- Les Petersen Drilling & PumpSanta RosaDrilling and pump service.
- Razo Drilling and PumpSanta RosaDrilling and pump service.
- Sonoma County Pump & WellSebastopolPump and well service.
- Weeks Drilling & PumpSebastopolDrilling and pump service.
Plumbing
- BluDog Rooter & PlumbingSanta RosaPlumbing.
- Curoso PlumbingSanta RosaPlumbing.
- Finetti Plumbing & BackflowSanta RosaPlumbing and backflow testing.
- KC Home ServicesSanta RosaPlumbing, heating and air.
- Mr. Rooter Plumbing of Sonoma CountySanta RosaPlumbing.
- United States PlumbingSanta RosaPlumbing.
Graywater and landscape
- Equinox LandscapePetalumaLists all types of graywater systems. Found in the Greywater Action directory.
- Permaculture ArtisansSebastopolEcological landscape design-build firm. Lists rain gardens, swales, rainwater harvesting and ponds.
- The Water FolkCotati and SebastopolLists consultation and all types of graywater systems. Found in the Greywater Action directory.
Guides
- Who to call about water in Sonoma CountyWells and septic go to Permit Sonoma. Tap water problems go to the utility that bills you. Pollution and state rules go to the Water Boards. This page lists each one.
- How to find a licensed water pro in Sonoma CountyMatch the job to the license, then look the license up on the state's site before you sign. It takes two minutes and the lookup is free.
- Books and resources on waterThree books and a few free guides to start. Listed, not paid for.
Own a water business? Submit or fix a listing.