All water systems in Ohio
4,165 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Shadyside Public Water System Belmont County |
3,689 | 2 | 1 | |
|
Minerva Village PWS Stark County |
3,684 | 1 | 1 | |
|
Carey Village PWS Wyandot County |
3,674 | 2 | 1 | |
|
Northwestern W and SD Weston Wood County |
3,648 | 0 | 0 | |
|
Northwestern W and SD Middleton Twp Wood County |
3,615 | 0 | 0 | |
|
Paulding Village PWS Paulding County |
3,605 | 5 | 1 | |
|
Hicksville Village Defiance County |
3,600 | 5 | 3 | |
|
Aqua Ohio Lake Darby Franklin County |
3,562 | 0 | 0 | |
|
Delta Village Fulton County |
3,518 | 2 | 1 | |
|
Lordstown Village PWS Trumbull County |
3,515 | 2 | 1 | |
|
MT Gilead Village PWS Morrow County |
3,503 | 1 | 1 | |
|
Honda Dma East Liberty Wtp Logan County |
3,500 | 0 | 0 | |
|
Commercial Point Village Pickaway County |
3,497 | 1 | 1 | |
|
Lockland Village PWS Hamilton County |
3,486 | 1 | 0 | |
|
North Baltimore Village Wood County |
3,432 | 2 | 1 | |
|
Licking County Harbor Hills PWS Licking County |
3,415 | 1 | 1 | |
|
Lebanon Correctional Institution Warren County |
3,410 | 1 | 1 | |
|
Honda Dma Anna Engine Plant Shelby County |
3,400 | 0 | 0 | |
|
Odrc-Pickaway Correction PWS Pickaway County |
3,376 | 6 | 4 | |
|
Morrow Village PWS Warren County |
3,360 | 2 | 2 | |
|
Cadiz Village PWS Harrison County |
3,353 | 6 | 0 | |
|
Mingo Junction PWS Jefferson County |
3,350 | 1 | 1 | |
|
Caldwell Village PWS Noble County |
3,300 | 1 | 1 | |
|
Athens Co., the Plains S.d. 1 PWS Athens County |
3,276 | 1 | 1 | |
|
Groveport PWS Franklin County |
3,229 | 0 | 0 | |
|
Aqua Ohio Village of Jefferson Ashtabula County |
3,226 | 0 | 0 | |
|
New London Village PWS Huron County |
3,226 | 0 | 0 | |
|
Western Guernsey Regional Water District Guernsey County |
3,225 | 2 | 1 | |
|
Dayton Vamc Water Treatment Plant-Bld330 Montgomery County |
3,216 | 2 | 0 | |
|
Millersport Village PWS Fairfield County |
3,200 | 1 | 1 | |
|
New Miami Village PWS Butler County |
3,200 | 0 | 0 | |
|
Fairport Harbor Village PWS Lake County |
3,180 | 2 | 0 | |
|
West Union Public Water System Adams County |
3,170 | 1 | 0 | |
|
Obetz Village PWS Franklin County |
3,167 | 3 | 1 | |
|
Millersburg Village PWS Holmes County |
3,151 | 1 | 1 | |
|
Kelleys Island Village Erie County |
3,125 | 1 | 0 | |
|
Genoa Village Ottawa County |
3,110 | 3 | 2 | |
|
Lakemore Village PWS Summit County |
3,068 | 1 | 1 | |
|
Oak Hill, Village of Jackson County |
3,067 | 1 | 1 | |
|
Carrollton Village Carroll County |
3,055 | 3 | 3 | |
|
Doylestown Village PWS Wayne County |
3,051 | 3 | 1 | |
|
New Bremen Village Auglaize County |
3,034 | 1 | 1 | |
|
Minster Village Auglaize County |
3,025 | 1 | 0 | |
|
Highland Ridge W and S Association INC Washington County |
3,022 | 1 | 1 | |
|
Clark County Green Meadows 2 PWS Clark County |
3,008 | 2 | 1 | |
|
Eldora Speedway Main Concessions PWS Darke County |
3,007 | 0 | 0 | |
|
Muskingum Valley Scout Coshocton County |
3,001 | 2 | 2 | |
|
Geauga County-Bainbridge Geauga County |
3,000 | 1 | 1 | |
|
Tri-County Rural W and S District Washington County |
3,000 | 1 | 0 | |
|
Baltimore Village PWS Fairfield County |
2,995 | 1 | 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.