Ventura County tap water
2 of 20 water systems serving Ventura County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 65 community water systems list this county as served; 20 serve 3,300+ people with full PFAS testing.
- 14 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 |
|---|---|---|---|---|
| Oxnard Water dept | Purchased surface water | 200,232 | No | 0 |
| Ventura Water department | Surface water | 112,285 | No | 0 |
| Ventura Wwd No. 8 - Simi Valley | Purchased surface water | 94,736 | No | 0 |
| Cal American Water CO | Purchased surface water | 66,809 | No | 0 |
| City of Thousand Oaks Water department | Purchased surface water | 54,770 | No | 0 |
| Camarillo Water dept | Purchased surface water | 47,701 | No | 0 |
| Golden State Water Company - Simi Valley | Purchased surface water | 45,086 | No | 0 |
| Ventura Cwwd No. 1 - Moorpark | Purchased surface water | 35,514 | No | 0 |
| Camrosa Water District | Purchased surface water | 32,700 | Yes | 0 |
| City of Santa Paula | Groundwater | 31,786 | No | 0 |
| Port Hueneme City Water dept | Purchased surface water | 21,582 | No | 0 |
| California Water Service CO - Westlake | Purchased surface water | 19,544 | No | 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.