Yakima County tap water
0 of 12 water systems serving Yakima County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 89 community water systems list this county as served; 11 serve 3,300+ people with full PFAS testing.
- 5 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 |
|---|---|---|---|---|
| Yakima Water Division City of | Surface water | 112,858 | No | 0 |
| Nob Hill Water Association | Groundwater | 38,050 | No | 0 |
| Toppenish Water Department | Groundwater | 13,382 | No | 0 |
| Grandview City of | Groundwater | 11,010 | No | 0 |
| Selah City of | Groundwater | 9,331 | No | 1 |
| Yak CO - Terrace Heights | Groundwater | 8,410 | No | 1 |
| Union Gap Water | Groundwater | 6,433 | No | 0 |
| Moxee Water Department | Groundwater | 5,599 | No | 0 |
| Wapato Waterworks | Groundwater | 5,255 | No | 0 |
| Granger Water Department | Groundwater | 3,993 | No | 0 |
| Naches Town of | Groundwater | 3,512 | 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.