Washington County tap water
4 of 12 water systems serving Washington County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 29 community water systems list this county as served; 12 serve 3,300+ people with full PFAS testing.
- 0 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 |
|---|---|---|---|---|
| Woodbury | Groundwater | 82,643 | Yes | 0 |
| Cottage Grove | Groundwater | 42,760 | No | 0 |
| Oakdale | Groundwater | 30,144 | No | 0 |
| Stillwater | Groundwater | 19,462 | Yes | 0 |
| Hugo | Groundwater | 12,047 | No | 0 |
| Forest Lake | Groundwater | 11,800 | No | 0 |
| Lake Elmo | Groundwater | 10,978 | Yes | 0 |
| Mahtomedi | Groundwater | 8,818 | No | 0 |
| Saint Paul Park | Groundwater | 5,427 | No | 0 |
| Oak Park Heights | Groundwater | 4,776 | No | 0 |
| Newport | Purchased groundwater | 4,000 | Yes | 0 |
| Lakeland Municipal Water | 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.