San Bernardino County tap water
13 of 49 water systems serving San Bernardino County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 143 community water systems list this county as served; 44 serve 3,300+ people with full PFAS testing.
- 30 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 |
|---|---|---|---|---|
| San Gabriel Valley Wc - Fontana | Surface water | 228,270 | No | 0 |
| San Bernardino City | Groundwater | 214,665 | No | 0 |
| Cucamonga Valley Water District | Surface water | 213,375 | No | 0 |
| Ontario Municipal Utilities Company | Purchased surface water | 185,010 | Yes | 0 |
| Victorville Water District | Purchased surface water | 140,721 | No | 0 |
| East Valley Water District | Surface water | 108,600 | Yes | 0 |
| Hesperia Wd | Groundwater | 101,836 | Yes | 0 |
| West Valley Water District | Surface water | 96,123 | No | 0 |
| Chino, City of | Purchased surface water | 90,187 | No | 0 |
| Upland, City of | Surface water | 78,376 | No | 0 |
| Redlands City Mud-Water Div | Surface water | 78,025 | Yes | 0 |
| Chino Hills, City of | Purchased surface water | 76,314 | 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.