764 water systems in Ohio have at least one health-based violation on record. The system with the most health-based violations is Campbell Soup Supply Co in Napoleon with 76 health-based violations. Health-based violations mean a system exceeded an EPA maximum contaminant level or failed required treatment standards.
| Water System | City | Population | Health Violations | Total Violations |
|---|
| Campbell Soup Supply Co |
Napoleon | 1,300 |
76 | 83 |
| Maysville Regional Water |
White Cottage | 6,540 |
71 | 84 |
| Hamler Village |
Hamler | 580 |
64 | 132 |
| Brunersburg Wd - Evansport |
Defiance | 268 |
49 | 52 |
| Holgate Village |
Holgate | 1,150 |
43 | 64 |
| Wauseon City |
Wauseon | 7,568 |
34 | 40 |
| Greenlawn Condos |
Springfield | 203 |
30 | 50 |
| Nelsonville Pws |
Nelsonville | 6,656 |
30 | 41 |
| Brunersburg Wd - Airport |
Defiance | 40 |
30 | 32 |
| Van Wert City |
Van Wert | 10,846 |
29 | 38 |
| West Farmington Village Pws |
West Farmington | 908 |
28 | 40 |
| Defiance City |
Defiance | 16,494 |
27 | 36 |
| Northwestern W and Sd - Mccomb |
Bowling Green | 1,650 |
27 | 34 |
| Ayersville Water and Sewer District |
Defiance | 1,660 |
26 | 33 |
| South Vienna Village Pws |
South Vienna | 393 |
24 | 56 |
| Northwestern W and Sd - Co Rd P |
Bowling Green | 440 |
24 | 35 |
| New Lexington |
New Lexington | 5,161 |
23 | 28 |
| Faith Life Church Pws |
New Albany | 900 |
23 | 27 |
| Byesville |
Byesville | 5,104 |
21 | 58 |
| Hamden Village Pws |
Hamden | 970 |
21 | 26 |
| Arcadia Village |
Arcadia | 564 |
20 | 31 |
| Delta Village |
Delta | 3,518 |
18 | 27 |
| Walden Woods Comm. Assoc. (Well 2)-Brown |
Wauseon | 200 |
18 | 27 |
| Rock Creek Village |
Rock Creek | 667 |
17 | 58 |
| Triad Middle School |
North Lewisburg | 675 |
17 | 31 |
| Galion City |
Galion | 10,453 |
17 | 28 |
| Green Springs Village |
Green Springs | 1,592 |
16 | 28 |
| Archbold Village |
Archbold | 5,586 |
16 | 16 |
| Sebring Village Pws |
Sebring | 6,058 |
15 | 37 |
| Christi Water System Inc |
Defiance | 483 |
14 | 31 |
| Lagrange Village Pws |
Lagrange | 2,400 |
13 | 24 |
| Clearfork MHP |
Bellville | 318 |
13 | 17 |
| Holden Arboretum |
Kirtland | 398 |
12 | 26 |
| Glandorf Village |
Glandorf | 1,001 |
12 | 21 |
| Hilltop Drive-In |
Rogers | 25 |
11 | 72 |
| Lake Wapusun North Well Pws |
Shreve | 453 |
10 | 22 |
| Bluffton Village |
Bluffton | 4,125 |
10 | 15 |
| Kenston Middle School |
Chagrin Falls | 515 |
10 | 12 |
| Perry Chapel Baptist Church-New |
Warsaw | 200 |
10 | 10 |
| Mansfield City |
Mansfield | 51,000 |
9 | 17 |
| Boyer Amlc |
Oak Harbor | 88 |
9 | 13 |
| Northeast Water System |
Wauseon | 1,250 |
9 | 12 |
| Northwestern W and Sd - Oregon Wtln 200 |
Bowling Green | 9,629 |
9 | 11 |
| Cadiz Village Pws |
Cadiz | 3,353 |
9 | 11 |
| Alliance City Pws |
Alliance | 22,232 |
9 | 9 |
| Terrace Lakes Camping |
New Waterford | 100 |
8 | 42 |
| Choctaw Utilities, Inc. |
London | 2,200 |
8 | 27 |
| The Virtues Golf Club Clubhouse Pws |
Nashport | 150 |
8 | 17 |
| Jersey Baptist Church |
New Albany | 368 |
8 | 11 |
| Springfield House Mimis House of Littles |
Springfield | 185 |
7 | 120 |
| Par Mar 211 |
Marietta | 25 |
7 | 80 |
| Zane Shawnee Caverns |
Bellefontaine | 40 |
7 | 38 |
| Attica Village |
Attica | 1,148 |
7 | 35 |
| Walnut Grove Campground No 3 |
Tiffin | 136 |
7 | 29 |
| Hillside MHP |
Port Clinton | 69 |
7 | 26 |
| Oakwood Village |
Oakwood | 727 |
7 | 25 |
| Elks Club 1377 Pws |
Kent | 50 |
7 | 22 |
| Shin Etsu Silicones of America |
Akron | 41 |
7 | 22 |
| Concord Care Center of Hartford |
Fowler | 99 |
7 | 21 |
| Heritage Private School |
Sterling | 85 |
7 | 11 |
| Cardinal Operating Company 1/ 2 Pws |
Brilliant | 168 |
7 | 10 |
| Metzenbaum Residence |
Chesterland | 28 |
7 | 10 |
| Hickory Manor Mobile Home Park |
Cincinnati | 250 |
6 | 89 |
| Mulligans Pub, Driving Range & Putt Putt |
Burton | 100 |
6 | 67 |
| Salem-Lisbon Koa |
Salem | 78 |
6 | 43 |
| Westview MHP |
Chardon | 450 |
6 | 26 |
| Oasis of Love Community Church |
Columbus | 120 |
6 | 22 |
| Wild Winds Buffalo Preserve |
Bryan | 25 |
6 | 22 |
| Montgomery County Water Services 1 Pws |
Kettering | 150,207 |
6 | 18 |
| Montgomery County Water Services 2 Pws |
Kettering | 83,033 |
6 | 18 |
| Chardon Woods of Journey |
Chardon | 650 |
6 | 17 |
| Woodsfield Village Pws |
Woodsfield | 2,598 |
6 | 16 |
| Mingo Junction Pws |
Mingo Junction | 3,350 |
6 | 15 |
| Bedford White Ave Irving |
Akron | 475 |
6 | 15 |
| Bellevue City |
Bellevue | 8,236 |
6 | 14 |
| Aqua Ohio - Mansfield System #08 |
Massillon | 170 |
6 | 14 |
| City of Steubenville |
Steubenville | 17,000 |
6 | 12 |
| Waynoka Regional Water and Sewer Dist |
Sardinia | 2,428 |
6 | 12 |
| City of Cambridge |
Cambridge | 10,520 |
6 | 10 |
| Lima City |
Lima | 65,619 |
6 | 9 |
| Spring Valley Mobile Home Park |
Galion | 160 |
6 | 9 |
| Bethlehem Lutheran Church |
Defiance | 145 |
6 | 9 |
| Hollansburg Park/Ball Diamond Pws |
Hollansburg | 25 |
6 | 9 |
| Guernsey Co. Water Dept. |
Cambridge | 8,891 |
6 | 7 |
| Brunersburg Wd - Tinora |
Defiance | 850 |
6 | 7 |
| Brunersburg Wd - Brunersburg |
Defiance | 500 |
6 | 7 |
| Clover Valley Golf Club Pws |
Johnstown | 133 |
6 | 7 |
| Good Vibrations Pws |
Twinsburg | 50 |
6 | 6 |
| Continental Village |
Delphos | 1,153 |
5 | 103 |
| St. Clairsville, City of Pws |
St. Clairsville | 5,097 |
5 | 53 |
| Columbus Grove Village |
Columbus Grove | 2,137 |
5 | 23 |
| Put-In-Bay Village |
Put-In-Bay | 700 |
5 | 22 |
| Northern Perry Co.Water #1 |
New Lexington | 1,706 |
5 | 21 |
| Vfw Post 7490 |
Louisville | 105 |
5 | 20 |
| Mcafee Tool and Die, Inc |
Uniontown | 30 |
5 | 19 |
| Jackson Lake Park - Shelter 4 |
Canal Winchester | 180 |
5 | 17 |
| 4-H Camp Piedmont Well 2 Pws |
New Philadelphia | 25 |
5 | 16 |
| Jefferson Co W&S District - J |
Steubenville | 896 |
5 | 14 |
| Northwestern W and Sd - Toledo Svc |
Bowling Green | 19,758 |
5 | 13 |
| Troy C Club Halfwayhouse |
Troy | 40 |
5 | 13 |