All water systems in Ohio
4,165 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Northwestern W and SD McComb Hancock County |
1,527 | 2 | 1 | |
|
Fort Loramie Village PWS Shelby County |
1,524 | 0 | 0 | |
|
South Range Local Schools K-12 PWS Mahoning County |
1,524 | 1 | 0 | |
|
Burton Village PWS Geauga County |
1,520 | 1 | 1 | |
|
Reno Water and Sewer 2 Washington County |
1,520 | 2 | 1 | |
|
Lynchburg Village PWS Highland County |
1,515 | 1 | 1 | |
|
Cincinnati Childrens Hosp Ionization Sys Hamilton County |
1,514 | 0 | 0 | |
|
Shreve Village PWS Wayne County |
1,514 | 2 | 1 | |
|
Sports Plex Greene County |
1,502 | 0 | 0 | |
|
FT Recovery Village Mercer County |
1,501 | 1 | 1 | |
|
Grand Rapids Village Wood County |
1,500 | 0 | 0 | |
|
Oakwood Village MHP Montgomery County |
1,500 | 3 | 2 | |
|
Odot Rest Area 1-26 SB Hancock County |
1,500 | 0 | 0 | |
|
Aqua Ohio Beechcrest Portage County |
1,496 | 1 | 1 | |
|
Hartville Marketplace PWS Stark County |
1,495 | 0 | 0 | |
|
Odnr Indian Lake ST PK Campground Logan County |
1,491 | 0 | 0 | |
|
Somerset Village of Perry County |
1,490 | 1 | 0 | |
|
Greenwich Village PWS Huron County |
1,476 | 2 | 1 | |
|
Arlington Village PWS Hancock County |
1,474 | 1 | 1 | |
|
Jackson Center Village PWS Shelby County |
1,462 | 3 | 2 | |
|
Odrc-Southeastern Correctional Institute Fairfield County |
1,461 | 1 | 1 | |
|
Pioneer Village Williams County |
1,449 | 2 | 1 | |
|
Miami East Schools PWS Miami County |
1,430 | 0 | 0 | |
|
Chauncey Athens County |
1,428 | 2 | 2 | |
|
Little Walnut Water Treatment Facility Fairfield County |
1,428 | 0 | 0 | |
|
Bremen Village Fairfield County |
1,425 | 3 | 2 | |
|
Elmore Village Ottawa County |
1,421 | 2 | 1 | |
|
West Salem Village PWS Wayne County |
1,410 | 3 | 2 | |
|
Hiram Village PWS Portage County |
1,406 | 3 | 2 | |
|
Crestview Local Schools Richland County |
1,400 | 0 | 0 | |
|
Licking Valley Elementary School PWS Licking County |
1,400 | 0 | 0 | |
|
Monroeville Village Huron County |
1,400 | 1 | 1 | |
|
Tallmadge-Portage County PWS Portage County |
1,400 | 0 | 0 | |
|
Waterloo K-12 Campus PWS Portage County |
1,400 | 1 | 0 | |
|
West Alexandria, Village of Preble County |
1,385 | 2 | 1 | |
|
Bethesda Public Water System Belmont County |
1,382 | 2 | 0 | |
|
Tiltonsville PWS Jefferson County |
1,372 | 2 | 1 | |
|
Milan Village PWS Erie County |
1,371 | 0 | 0 | |
|
Jeffersonville Village PWS Fayette County |
1,356 | 5 | 2 | |
|
Forest Village Hardin County |
1,354 | 2 | 2 | |
|
Liberty Center Village Henry County |
1,350 | 0 | 0 | |
|
South Main Centre Ltd Summit County |
1,347 | 0 | 0 | |
|
Fayette Village Fulton County |
1,340 | 1 | 1 | |
|
Frazeysburg PWS Muskingum County |
1,340 | 1 | 1 | |
|
United Local Schools Columbiana County |
1,340 | 0 | 0 | |
|
Youngs Jersey Dairy PWS Clark County |
1,340 | 0 | 0 | |
|
Odot Rest Area 7-26/7-25 PWS Auglaize County |
1,333 | 0 | 0 | |
|
Pemberville Village PWS Wood County |
1,326 | 2 | 1 | |
|
Elgin Local Schools PWS Marion County |
1,321 | 0 | 0 | |
|
Obetz Satellite 6 PWS Franklin County |
1,317 | 2 | 1 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Ohio records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.