Ohio tap water by county
Hardness, PFAS sampling, lead and violations for the largest water systems in 8 Ohio counties. In 7 of them, at least one large system detected PFAS in EPA testing (a detection isn't a violation).
| County | Largest system | Hardness | PFAS detected |
|---|---|---|---|
| Franklin County | Columbus Public Water System | 7.0 gpg (medium) | 4 of 6 systems |
| Cuyahoga County | Cleveland Public Water System | 6.8 gpg (high) | 0 of 5 systems |
| Hamilton County | Cincinnati Public Water System | 126–140 mg/L (varies) (high) | 3 of 6 systems |
| Summit County | Akron City Pws | 6.3 gpg (high) | 1 of 6 systems |
| Montgomery County | Dayton Public Water System | 19.2 gpg (low) | 3 of 6 systems |
| Lucas County | Toledo City of | Test (no data) | 4 of 6 systems |
| Butler County | Butler Co. Water District 2 Pws | 19.0 gpg (low) | 6 of 6 systems |
| Stark County | Canton Public Water System | 17.4 gpg (low) | 3 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.