Dane County tap water
0 of 15 water systems serving Dane County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 46 community water systems list this county as served; 15 serve 3,300+ people with full PFAS testing.
- 12 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 |
|---|---|---|---|---|
| Madison Water Utility | Groundwater | 272,000 | No | 1 |
| Sun Prairie Utilities | Groundwater | 39,300 | No | 1 |
| Fitchburg Utility Dist 1 | Groundwater | 29,900 | No | 0 |
| Middleton Waterworks | Groundwater | 23,868 | No | 1 |
| Waunakee Waterworks | Groundwater | 14,879 | No | 0 |
| Verona Waterworks | Groundwater | 14,030 | No | 1 |
| Stoughton Waterworks | Groundwater | 13,078 | No | 0 |
| Oregon Waterworks | Groundwater | 11,200 | No | 0 |
| Deforest Waterworks | Groundwater | 10,500 | No | 1 |
| Mcfarland Waterworks | Groundwater | 9,676 | No | 0 |
| Cottage Grove Waterworks | Groundwater | 9,345 | No | 1 |
| Monona Waterworks | Groundwater | 8,624 | 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.