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California: drinking water records

EPA lists 2,928 community water systems serving homes in California. 691 took part in EPA's national PFAS survey (UCMR 5), and 236 found at least one PFAS above the level laboratories can measure.

In focus2,928community water systems
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Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

0
ZIP reports published
2,928
community water systems
928
systems with a health-based violation since 2016
200
systems that reached the lead action level since 2016

PFAS in EPA’s final survey

236 of the 691 California systems in EPA’s national PFAS survey found at least one PFAS, and 128 had a PFOA or PFOS yearly average at or above EPA’s limit. See California’s PFAS results by system and compound.

Counties

ZIP reports

Beyond the California overview

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PFASCalifornia PFAS resultsWhich California systems found PFAS in EPA’s final survey, and which compounds turned up most often.LeadLead in drinking waterHow EPA’s lead records work and what the action level means for your home’s pipes.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.
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Sources

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

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