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Ohio Water Quality
4,181 public water systems serving 11,085,226 people.
Water Systems
4,181
Total Violations
288,388
Violation Rate
90.4%
PFAS Detection
59%
204 of 346 tested
Largest Water Systems
CLEVELAND PUBLIC WATER SYSTEM
CLEVELAND, OH · 1,308,955 served
COLUMBUS PUBLIC WATER SYSTEM
COLUMBUS, OH · 1,305,946 served
CINCINNATI PUBLIC WATER SYSTEM
CINCINNATI, OH · 750,200 served
TOLEDO CITY OF
TOLEDO, OH · 360,000 served
AKRON CITY PWS
KENT, OH · 280,000 served
MONTGOMERY COUNTY WATER SERVICES 1 PWS
KETTERING, OH · 150,207 served
DEL-CO WATER COMPANY, INC.
DELAWARE, OH · 150,000 served
DAYTON PUBLIC WATER SYSTEM
DAYTON, OH · 141,407 served
CLERMONT PUBLIC WATER SYSTEM
BATAVIA, OH · 133,059 served
YOUNGSTOWN CITY PWS
YOUNGSTOWN, OH · 130,530 served
BUTLER CO. WATER DISTRICT 2 PWS
HAMILTON, OH · 116,572 served
CANTON PUBLIC WATER SYSTEM
CANTON, OH · 107,113 served
AQUA OHIO - MASSILLON PWS
MASSILLON, OH · 95,636 served
MONTGOMERY COUNTY WATER SERVICES 2 PWS
KETTERING, OH · 83,033 served
LAKE COUNTY WEST WATER SUBDISTRICT
PAINESVILLE, OH · 78,379 served
WARREN COUNTY
LEBANON, OH · 78,299 served
AQUA OHIO - MENTOR
MENTOR, OH · 74,500 served
RURAL LORAIN CO. WATER A
LAGRANGE, OH · 73,125 served
ELYRIA WATER DEPARTMENT
LORAIN, OH · 68,000 served
LIMA CITY
LIMA, OH · 65,619 served
Most Violations
#1 SONRISE CHURCH ARCANUM
1,786 #2 FRONTIER CAMPGROUND WAYNESVILLE
1,580 #3 WHISPERING WINDS MHC GRAND RAPIDS
1,429 #4 WOODBURY APARTMENTS PWS DAYTON
1,407 #5 CHURCH OF TROY GARRETTSVILLE
1,144 #6 VICTORY CHRISTIAN SCHOOL URBANA
1,095 #7 FOSTORIA MOBILE ESTATES FOSTORIA
1,067 #8 ZION CHRISTIAN SCHOOL MILLERSBURG
1,039 #9 WESTERN RESERVE VILLAGE AKRON
950 #10 CEDAR OAKS WELLNESS CENTER OREGONIA
917 #11 TERRACE GLEN MHP LLC CHARDON
905 #12 HOPE COMMUNITY CHURCH OF THE NAZARENE CARROLL
873 #13 DAWSONS MOBILE HOME PARK PWS PIKETON
855 #14 BUCKEYE FORD INC LONDON
843 #15 MCCARTNEY MOBILE ESTATES MHP 1 LAS VEGAS
843 Counties in Ohio
Franklin
96 systems · 1,503,985 served
· 5,342 violations
Cuyahoga
11 systems · 1,410,751 served
· 1,166 violations
Hamilton
28 systems · 842,267 served
· 1,480 violations
Montgomery
74 systems · 529,379 served
· 4,724 violations
Summit
214 systems · 467,695 served
· 17,163 violations
Lucas
46 systems · 433,198 served
· 3,569 violations
Butler
22 systems · 378,755 served
· 1,035 violations
Lorain
17 systems · 330,150 served
· 1,534 violations
Stark
182 systems · 314,229 served
· 12,064 violations
Warren
21 systems · 242,137 served
· 4,221 violations
Lake
20 systems · 230,589 served
· 1,095 violations
Mahoning
75 systems · 228,296 served
· 4,611 violations
Delaware
5 systems · 195,368 served
· 521 violations
Clermont
9 systems · 187,400 served
· 1,204 violations
Greene
56 systems · 180,062 served
· 3,157 violations
Trumbull
89 systems · 160,312 served
· 6,699 violations
Licking
88 systems · 129,554 served
· 6,135 violations
Portage
173 systems · 127,607 served
· 9,333 violations
Wood
55 systems · 116,066 served
· 3,536 violations
Medina
63 systems · 115,354 served
· 3,445 violations
Clark
92 systems · 106,745 served
· 9,196 violations
Richland
121 systems · 103,898 served
· 6,673 violations
Fairfield
75 systems · 100,143 served
· 6,414 violations
Miami
57 systems · 94,299 served
· 4,277 violations
Allen
41 systems · 90,674 served
· 3,083 violations
Ashtabula
57 systems · 87,422 served
· 3,578 violations
Wayne
177 systems · 85,031 served
· 10,471 violations
Scioto
17 systems · 83,235 served
· 348 violations
Erie
13 systems · 80,465 served
· 980 violations
Athens
13 systems · 75,476 served
· 1,430 violations
Showing top 30 of 88 counties.