Find a California ELAP-certified laboratory qualified for the specific drinking-water constituents needed before sampling a newly completed well
domain: waterboards.ca.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Use the State Water Resources Control Board's Environmental Laboratory Accreditation Program (ELAP) interactive map/list at https://www.waterboards.ca.gov/drinking_water/certlic/labs/
Confirm the specific lab is accredited for drinking water testing and, more specifically, for the exact analyte(s) needed (e.g. bacteria, nitrate, arsenic, PFAS) — accreditation is analyte-specific, not blanket
Call ahead to the lab and explicitly ask whether they are ELAP-certified for the requested analysis, since certification scope isn't always obvious from the directory listing alone
Budget accordingly — basic single-parameter sampling commonly runs roughly $35–$400 depending on analyte and lab
Use the GAMA (Groundwater Ambient Monitoring and Assessment Program) resources for background on regional groundwater quality context when interpreting results
Known gotchas
ELAP certification is per-analyte/method, not a blanket 'certified lab' status — a lab certified for bacteria may not be certified for PFAS or metals
This directory covers California only; other states run their own separate lab-certification programs under different names
Sample handling/chain-of-custody requirements (holding time, preservation) vary by analyte — a technically certified lab result can still be invalidated by improper field sampling
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