Wisconsin tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 3 Wisconsin counties. In 2 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| Milwaukee County | Milwaukee Waterworks | 8.0 gpg (high) | 0 of 6 systems |
| Dane County | Madison Water Utility | 3.6 gpg (low) | 2 of 6 systems |
| Waukesha County | Waukesha Water Utility | 16.1 gpg (low) | 2 of 6 systems |
Public-record figures, not a test of your tap. Not 100% accurate or guaranteed. Confirm with a water test, your utility or a qualified pro before you buy or act.
Hardness confidence: high = utility report; low = county estimate of untreated local water. Don't see your county? Use the water quality lookup.