Monterey County tap water
1 of 16 water systems serving Monterey County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 157 community water systems list this county as served; 12 serve 3,300+ people with full PFAS testing.
- 44 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 |
|---|---|---|---|---|
| Cal Am Water Company - Monterey | Groundwater under surface influence | 128,928 | Yes | 0 |
| Cwsc Salinas | Groundwater | 114,286 | No | 0 |
| Alco Water Service | Groundwater | 56,253 | No | 0 |
| Marina Coast Water District | Groundwater | 38,918 | No | 0 |
| Soledad, City of | Groundwater | 19,732 | No | 0 |
| Greenfield, City of | Groundwater | 18,967 | No | 0 |
| Cwsc King City | Groundwater | 14,046 | No | 0 |
| Gonzales, City of | Groundwater | 8,333 | No | 0 |
| Cwsc Salinas Hills | Groundwater | 7,733 | No | 0 |
| Castroville Community Services District | Groundwater | 7,515 | No | 0 |
| Correctional Training Facility - Soledad | Groundwater | 4,357 | No | 0 |
| Psmcsd - Pajaro | Groundwater | 3,500 | 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.