Orange County tap water
10 of 29 water systems serving Orange County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 37 community water systems list this county as served; 29 serve 3,300+ people with full PFAS testing.
- 2 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Irvine Ranch Water District | Surface water | 450,323 | No | 0 |
| City of Anaheim | Surface water | 350,254 | Yes | 0 |
| City of Santa Ana | Purchased surface water | 316,184 | Yes | 0 |
| City of Huntington Beach | Purchased surface water | 201,000 | Yes | 0 |
| City of Garden Grove | Purchased surface water | 174,226 | Yes | 0 |
| Moulton Niguel Water District | Purchased surface water | 168,315 | No | 0 |
| Santa Margarita Water District | Purchased surface water | 165,275 | No | 0 |
| City of Fullerton | Purchased surface water | 140,054 | Yes | 0 |
| City of Orange | Purchased surface water | 120,770 | Yes | 0 |
| Golden State Wc - West Orange County | Purchased surface water | 114,693 | Yes | 0 |
| Mesa Water District | Purchased surface water | 110,000 | No | 0 |
| City of Westminster | Purchased surface water | 93,591 | Yes | 0 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.