All water systems in Ohio
4,165 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Northern Ohio Rural Water Huron County |
18,224 | 1 | 1 | |
|
Licking Regional Water District Licking County |
17,818 | 0 | 0 | |
|
Norwalk City PWS Huron County |
17,466 | 0 | 0 | |
|
New Philadelphia City PWS Tuscarawas County |
17,410 | 1 | 1 | |
|
Erie CO Perkins District Erie County |
17,241 | 2 | 1 | |
|
Steubenville, City of Jefferson County |
17,000 | 2 | 1 | |
|
Mount Vernon City PWS Knox County |
16,990 | 2 | 1 | |
|
Salem City Columbiana County |
16,850 | 1 | 1 | |
|
Wright-Patterson Afb Area a PWS Greene County |
16,551 | 0 | 0 | |
|
Defiance City Defiance County |
16,494 | 1 | 1 | |
|
Tuppers Plains/chester Water District Meigs County |
16,087 | 1 | 1 | |
|
Ravenna City PWS Portage County |
16,000 | 0 | 0 | |
|
Jackson Co. Water Company-Wtp Jackson County |
15,984 | 2 | 2 | |
|
Aurora City Cleveland PWS Portage County |
15,852 | 1 | 0 | |
|
Monroe City PWS Butler County |
15,600 | 3 | 1 | |
|
Pike Water, Inc.-Plant PWS Pike County |
15,487 | 3 | 2 | |
|
Streetsboro City PWS Portage County |
15,105 | 0 | 0 | |
|
Indian Hill City PWS Hamilton County |
15,000 | 0 | 0 | |
|
Ashtabula County Water System Ashtabula County |
14,757 | 1 | 0 | |
|
Coshocton PWS Coshocton County |
14,319 | 1 | 1 | |
|
Maumee City Lucas County |
14,286 | 0 | 0 | |
|
Bexley City PWS Franklin County |
14,250 | 2 | 1 | |
|
Washington Court House PWS Fayette County |
14,100 | 2 | 1 | |
|
Jefferson CO W and S District M Jefferson County |
13,983 | 4 | 2 | |
|
Circleville City PWS Pickaway County |
13,927 | 0 | 0 | |
|
Scioto Co. Regional Water District #1 Scioto County |
13,820 | 2 | 0 | |
|
Englewood City PWS Montgomery County |
13,463 | 0 | 0 | |
|
Fostoria City Seneca County |
13,441 | 0 | 0 | |
|
Girard City Trumbull County |
13,263 | 1 | 1 | |
|
Dover City PWS Tuscarawas County |
13,253 | 2 | 1 | |
|
Bellefontaine City PWS Logan County |
13,249 | 3 | 2 | |
|
Greenville City PWS Darke County |
13,227 | 1 | 1 | |
|
Bedford City PWS Cuyahoga County |
13,149 | 2 | 0 | |
|
Trenton City PWS Butler County |
13,012 | 1 | 1 | |
|
Loveland City PWS Clermont County |
12,800 | 1 | 1 | |
|
East Liverpool City Columbiana County |
12,586 | 2 | 0 | |
|
Bucyrus City Crawford County |
12,570 | 1 | 0 | |
|
Conneaut Ashtabula County |
12,538 | 1 | 1 | |
|
Wilmington City PWS Clinton County |
12,401 | 1 | 0 | |
|
Amherst City PWS Lorain County |
11,797 | 1 | 1 | |
|
Franklin Public Water System Warren County |
11,690 | 1 | 0 | |
|
Celina, City of Mercer County |
11,682 | 1 | 1 | |
|
Harrison City PWS Hamilton County |
11,600 | 1 | 1 | |
|
Urbana City PWS Champaign County |
11,428 | 4 | 0 | |
|
UH Cleveland Medical Center Cuyahoga County |
11,395 | 1 | 0 | |
|
Jefferson Water and Sewer District PWS Franklin County |
11,294 | 1 | 1 | |
|
Ironton Lawrence County |
11,129 | 3 | 2 | |
|
Northwest Regional Water District Scioto County |
11,059 | 0 | 0 | |
|
Wright-Patterson Afb Area B PWS Greene County |
11,034 | 0 | 0 | |
|
Hdma Benton RD PWS Union County |
11,025 | 0 | 0 |
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.