Washington County tap water
0 of 10 water systems serving Washington County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 28 community water systems list this county as served; 10 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 |
|---|---|---|---|---|
| Tualatin Valley Water District | Purchased surface water | 224,600 | No | 0 |
| Hillsboro, City of | Purchased surface water | 92,632 | No | 0 |
| Beaverton, City of | Purchased surface water | 88,045 | No | 0 |
| Tigard, City of | Purchased surface water | 62,500 | No | 0 |
| Tualatin, City of | Purchased surface water | 28,106 | No | 0 |
| Forest Grove, City of | Surface water | 26,838 | No | 0 |
| Sherwood, City of | Purchased surface water | 20,781 | No | 0 |
| Cornelius, City of | Purchased surface water | 14,490 | No | 0 |
| West Slope Water District | Purchased surface water | 11,000 | No | 0 |
| Raleigh Water District | Purchased surface water | 4,500 | 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.