All water systems in Ohio
4,165 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Mid-Ohio Wsd Old Springfield Road Wtp Madison County |
5,176 | 2 | 1 | |
|
New Lexington Perry County |
5,161 | 3 | 1 | |
|
Erie CO Margaretta District Erie County |
5,131 | 2 | 2 | |
|
Byesville Guernsey County |
5,104 | 5 | 2 | |
|
St. Clairsville, City of PWS Belmont County |
5,097 | 5 | 1 | |
|
Munroe Falls City PWS Summit County |
5,042 | 0 | 0 | |
|
Put-In-Bay Village Ottawa County |
5,000 | 2 | 1 | |
|
Chagrin Falls Village PWS Cuyahoga County |
4,991 | 1 | 1 | |
|
West Milton Village PWS Miami County |
4,890 | 1 | 1 | |
|
Lexington Village Richland County |
4,825 | 2 | 2 | |
|
Jefferson Regional Water Authority Montgomery County |
4,813 | 1 | 1 | |
|
Wellington Village PWS Lorain County |
4,802 | 3 | 1 | |
|
Greene County Eastern Regional PWS Greene County |
4,800 | 1 | 1 | |
|
Northwestern W and SD Portage Wood County |
4,776 | 0 | 0 | |
|
Coldwater Village Mercer County |
4,774 | 1 | 0 | |
|
East Palestine Village PWS Columbiana County |
4,761 | 1 | 1 | |
|
Medina Co/southern Water Dist PWS Medina County |
4,708 | 1 | 1 | |
|
Greenfield Village PWS Highland County |
4,600 | 1 | 0 | |
|
Ashville Village PWS Pickaway County |
4,529 | 2 | 0 | |
|
Crestline Village PWS Crawford County |
4,525 | 1 | 1 | |
|
West Jefferson Village PWS Madison County |
4,488 | 2 | 1 | |
|
Mid-Ohio Wsd Jackson Street Wtp Madison County |
4,467 | 2 | 1 | |
|
Waverly City PWS Pike County |
4,433 | 2 | 1 | |
|
Oak Harbor Village Ottawa County |
4,400 | 2 | 1 | |
|
Ottawa Village Putnam County |
4,393 | 3 | 0 | |
|
Monroe Water Systems Monroe County |
4,334 | 2 | 1 | |
|
Georgetown Village PWS Brown County |
4,331 | 1 | 1 | |
|
Montpelier Village Williams County |
4,280 | 2 | 0 | |
|
Bellaire Public Water System Belmont County |
4,278 | 3 | 2 | |
|
Blanchester Village PWS Clinton County |
4,243 | 0 | 0 | |
|
McDonald Village PWS Trumbull County |
4,236 | 1 | 1 | |
|
Clark County Park Layne PWS Clark County |
4,221 | 0 | 0 | |
|
Sheffield Village PWS Lorain County |
4,165 | 0 | 0 | |
|
Cincinnati VA Medical Center Hamilton County |
4,152 | 0 | 0 | |
|
South Point Village Lawrence County |
4,133 | 2 | 2 | |
|
Elida Village Allen County |
4,109 | 3 | 0 | |
|
Waynesville Village PWS Warren County |
4,100 | 2 | 0 | |
|
Bluffton Village Allen County |
4,082 | 1 | 1 | |
|
Southern Perry Co-Congo Perry County |
4,029 | 1 | 1 | |
|
Aqua Ohio Masury Trumbull County |
4,019 | 1 | 1 | |
|
Cedarville University Greene County |
4,000 | 2 | 1 | |
|
Trihealth Good Samaritan Hospital Hamilton County |
4,000 | 0 | 0 | |
|
Kettering Health Main Campus Montgomery County |
3,946 | 1 | 0 | |
|
Wintersville Village PWS Jefferson County |
3,924 | 3 | 2 | |
|
Newcomerstown Village PWS Tuscarawas County |
3,882 | 2 | 2 | |
|
Swanton Village Fulton County |
3,855 | 0 | 0 | |
|
Miami Co-Camp Troy PWS Miami County |
3,813 | 2 | 0 | |
|
New Lebanon Village PWS Montgomery County |
3,770 | 1 | 1 | |
|
Yellow Springs Village PWS Greene County |
3,761 | 2 | 1 | |
|
Jackson/milton Metro Water District PWS Mahoning County |
3,728 | 3 | 2 |
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.