Public Water Systems
4,181 active public water systems in OH, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
|---|---|---|---|---|
| Cleveland Public Water System | Cleveland, OH | 1,308,955 | 195 | Clean |
| Columbus Public Water System | Columbus, OH | 1,305,946 | 33 | Detected |
| Cincinnati Public Water System | Cincinnati, OH | 750,200 | 0 | Detected |
| Toledo City Of | Toledo, OH | 360,000 | 26 | Detected |
| Akron City PWS | Kent, OH | 280,000 | 214 | Detected |
| Montgomery County Water Services 1 PWS | Kettering, OH | 150,207 | 33 | Detected |
| Del-Co Water Company, Inc. | Delaware, OH | 150,000 | 108 | Detected |
| Dayton Public Water System | Dayton, OH | 141,407 | 46 | Detected |
| Clermont Public Water System | Batavia, OH | 133,059 | 62 | Detected |
| Youngstown City PWS | Youngstown, OH | 130,530 | 12 | Detected |
| Butler Co. Water District 2 PWS | Hamilton, OH | 116,572 | 27 | Detected |
| Canton Public Water System | Canton, OH | 107,113 | 34 | Clean |
| Aqua Ohio - Massillon PWS | Massillon, OH | 95,636 | 9 | Detected |
| Montgomery County Water Services 2 PWS | Kettering, OH | 83,033 | 32 | Detected |
| Lake County West Water Subdistrict | Painesville, OH | 78,379 | 6 | Clean |
| Warren County | Lebanon, OH | 78,299 | 153 | Clean |
| Aqua Ohio - Mentor | Mentor, OH | 74,500 | 10 | Clean |
| Rural Lorain Co. Water A | Lagrange, OH | 73,125 | 21 | Detected |
| Elyria Water Department | Lorain, OH | 68,000 | 74 | Clean |
| Lima City | Lima, OH | 65,619 | 59 | Detected |
| Lorain City PWS | Lorain, OH | 64,152 | 83 | Clean |
| Hamilton Public Water System | Fairfield, OH | 62,447 | 63 | Detected |
| Springfield City PWS | Springfield, OH | 60,680 | 12 | Clean |
| Aqua Ohio - Struthers | Struthers, OH | 58,551 | 123 | Detected |
| Findlay City | Findlay, OH | 54,040 | 45 | Clean |
| Middletown City PWS | Trenton, OH | 51,229 | 61 | Detected |
| Cuyahoga Falls City PWS | Cuyahoga Falls, OH | 51,114 | 94 | Clean |
| Mansfield City | Mansfield, OH | 51,000 | 84 | Clean |
| Lakewood City PWS | Lakewood, OH | 50,942 | 41 | Clean |
| Newark City PWS | Newark, OH | 49,934 | 70 | Detected |
| Warren City PWS | Warren, OH | 49,130 | 197 | Detected |
| Medina Co/Northwest PWS | Medina, OH | 46,324 | 27 | Detected |
| Aqua Ohio - Marion | Marion, OH | 46,317 | 20 | Clean |
| Fairfield City PWS | Fairfield, OH | 44,907 | 14 | Detected |
| Delaware City PWS | Delaware, OH | 43,895 | 18 | Clean |
| Huber Heights Public Water System | Huber Heights, OH | 43,439 | 39 | Clean |
| Southwest Regional Water District | Hamilton, OH | 42,856 | 0 | Detected |
| Greene Co.-Northwest Reg Water | Beavercreek, OH | 41,000 | 61 | Clean |
| Lake County East Water Subdistrict | Painesville, OH | 40,656 | 17 | Clean |
| Portsmouth City | Portsmouth, OH | 40,475 | 8 | Detected |
| Lancaster City PWS | Lancaster, OH | 40,400 | 9 | Clean |
| Western Water Company | Morrow, OH | 39,508 | 67 | Detected |
| Westerville City PWS | Pataskala, OH | 39,000 | 32 | Detected |
| Reynoldsburg City PWS | Reynoldsburg, OH | 37,847 | 5 | Detected |
| Stow Public Water System | Stow, OH | 35,437 | 18 | Clean |
| Ross County Water Co Inc | Chillicothe, OH | 35,345 | 28 | Detected |
| Hecla Water Association | Ironton, OH | 34,942 | 19 | Detected |
| Fairborn Public Water System | Jamestown, OH | 34,620 | 27 | Clean |
| Gahanna City PWS | Glenford, OH | 33,258 | 37 | Clean |
| Athens PWS | Athens, OH | 32,725 | 29 | Clean |
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