State rankings
Ohio water-system rankings
Lowest-scoring systems in Ohio
Ranked lowest score first. Population shown for context.
1 WRIGHT-PATTERSON AFB AREA B PWS VANDALIA, OH · ~11,034 served 22 2 TRUMBULL CO. - HOWLAND TWP PWS VIENNA, OH · ~6,396 served 56 3 MONTGOMERY COUNTY WATER SERVICES 1 PWS KETTERING, OH · ~150,207 served 57 4 CANFIELD CITY PWS CANFIELD, OH · ~7,706 served 57 5 MILFORD CITY PWS MILFORD, OH · ~6,700 served 60 6 NEWTON FALLS CITY NEWTON FALLS, OH · ~6,109 served 62 7 MCDONALD VILLAGE PWS MCDONALD, OH · ~3,172 served 64 8 CLERMONT PUBLIC WATER SYSTEM BATAVIA, OH · ~133,059 served 67 9 WESTERN WATER COMPANY MORROW, OH · ~39,508 served 67 10 INDIAN HILL CITY PWS CINCINNATI, OH · ~15,000 served 67 11 LOVELAND CITY PWS LOVELAND, OH · ~12,800 served 67 12 GUERNSEY CO. WATER DEPT. CAMBRIDGE, OH · ~8,891 served 67 13 WARREN COMM W AND S ASSN 2 MARIETTA, OH · ~7,215 served 67 14 BARNESVILLE BARNESVILLE, OH · ~6,500 served 67 15 YELLOW SPRINGS VILLAGE PWS YELLOW SPRINGS, OH · ~3,761 served 67 16 LORDSTOWN VILLAGE PWS LORDSTOWN, OH · ~3,515 served 67 17 CALDWELL VILLAGE PWS CALDWELL, OH · ~3,300 served 67 18 PUTNAM COMMUNITY WATER ASSOCIATION PWS MARIETTA, OH · ~2,744 served 67 19 DAYTON PUBLIC WATER SYSTEM DAYTON, OH · ~141,407 served 68 20 GIRARD CITY GIRARD, OH · ~14,122 served 68 21 WILMINGTON CITY PWS WILMINGTON, OH · ~12,401 served 68 22 TRUMBULL CO. - SOUTHEAST PWS VIENNA, OH · ~9,931 served 68 23 BETHEL VILLAGE PWS BETHEL, OH · ~2,620 served 68 24 GALLIA CO RURAL WATER ASSOCIATION GALLIPOLIS, OH · ~20,995 served 70 25 JACKSON/MILTON METRO WATER DISTRICT PWS YOUNGSTOWN, OH · ~3,728 served 70
Highest-scoring large systems in Ohio
Systems serving 10,000+ people with the best scores.
1 CLEVELAND PUBLIC WATER SYSTEM CLEVELAND, OH · ~1,308,955 served 100 2 TOLEDO CITY OF TOLEDO, OH · ~360,000 served 100 3 BUTLER CO. WATER DISTRICT 2 PWS HAMILTON, OH · ~116,572 served 100 4 CANTON PUBLIC WATER SYSTEM CANTON, OH · ~107,113 served 100 5 AQUA OHIO - MASSILLON PWS MASSILLON, OH · ~95,636 served 100 6 WARREN COUNTY LEBANON, OH · ~81,975 served 100 7 LAKE COUNTY WEST WATER SUBDISTRICT PAINESVILLE, OH · ~78,379 served 100 8 AQUA OHIO - MENTOR MENTOR, OH · ~74,500 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.