Michigan tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 6 Michigan counties. In 4 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| Wayne County | Detroit City of | 6.3 gpg (high) | 0 of 6 systems |
| Oakland County | Troy | Test (no data) | 2 of 6 systems |
| Macomb County | Warren, City of | 6.1 gpg (high) | 0 of 6 systems |
| Kent County | Grand Rapids | 8.3 gpg (high) | 1 of 6 systems |
| Genesee County | Flint, City of | Test (no data) | 1 of 6 systems |
| Washtenaw County | Ann Arbor | 16.4 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.