CA · 58 COUNTIES
Certified labs and testing options for private well owners in California.
Private well owners in California are responsible for the safety of their own water. Based on groundwater data across the state — particularly pH and Manganese — we recommend the following testing approach.
Tap Score offers certified mail-in testing with results in 5–7 business days, tailored to regional contaminant patterns.
Order a Tap Score Well Water Test →State-certified labs in California:
Getting Your Water Tested → Well Water Testing California | Certified Laboratory ... → Professional Water Test Lab | Drinking Water Testing Service in CA → Water Testing for Private Wells - Sonoma County Emergency → Well Water Testing – Why It's So Important → Drinking Water Testing Laboratory — Babcock Laboratories, Inc. → Drinking, Well Water Testing Analysis Lab | California Laboratory Services → Water Quality Testing & Analysis: Residential & Commercial Supply Testing for Contaminants & Heavy Metals in San Diego, Orange County and Bay Area | Vert Environmental → Water Quality Testing Labs - Cal Water → Drinking Water & Well Water Testing - Environmental testing and analysis labs, ELAP, NADCAP accredited | Pat Chem Laboratories →Based on California groundwater data, the most commonly detected contaminants in private wells are:
Water quality varies significantly by county. Find your county → for a targeted testing recommendation based on local data.
If testing reveals a contaminant of concern, these are the most effective treatment systems for pH — the most commonly detected issue across California well water.