Ohio
Hamilton County drinking water quality
28 active public water systems serve 892,067 people in Hamilton County. 13 are compliant, 15 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 0 carry a health flag.
Needs attention
Community water systems
12 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cincinnati Public Water System |
800,000 | 0 | 0 | |
|
Norwood City PWS |
19,870 | 1 | 1 | |
|
Indian Hill City PWS |
15,000 | 0 | 0 | |
|
Harrison City PWS |
11,600 | 1 | 1 | |
|
Wyoming City PWS |
9,700 | 1 | 0 | |
|
Reading City PWS |
9,506 | 2 | 2 | |
|
Cleves Village PWS |
6,000 | 2 | 2 | |
|
Lockland Village PWS |
3,486 | 1 | 0 | |
|
Glendale Village PWS |
2,500 | 2 | 1 | |
|
Addyston Village PWS |
900 | 3 | 2 | |
|
Twin Rivers Water Corporation |
245 | 2 | 1 | |
|
Dry Fork Pointe MHP |
230 | 1 | 1 |
Non-community systems (16: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Cincinnati VA Medical Center |
4,152 | 0 | 0 | |
|
Trihealth Good Samaritan Hospital |
4,000 | 0 | 0 | |
|
Cincinnati Childrens Hosp Ionization Sys |
1,514 | 0 | 0 | |
|
Cincinnati Childrens Med Center Col Hill |
722 | 0 | 0 | |
|
Four Seasons Marina |
615 | 0 | 0 | |
|
UC Health Medical Center Scis |
558 | 0 | 0 | |
|
Cincinnati Incorporated |
278 | 0 | 0 | |
|
The Root Beer Stand |
270 | 2 | 0 | |
|
UC Health Ridgeway Tower |
208 | 0 | 0 | |
|
Indian Hill Winter Club PWS |
200 | 1 | 0 | |
|
Blue Bell Beach PWS |
123 | 4 | 0 | |
|
Whitewater Processing, LLC |
120 | 0 | 0 | |
|
Robins Nest Golf Course PWS |
100 | 0 | 0 | |
|
Taylor Creek Youth Org. PWS |
100 | 2 | 1 | |
|
Whitewater Senior Center PWS |
45 | 0 | 0 | |
|
Carolaura Farm, Ltd PWS |
25 | 1 | 1 |
Inactive systems (104, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.