Kentucky drinking water quality
Kentucky has 423 active public water systems serving 5.1 million people. 142 of them, 34%, had at least one EPA violation in the past three years, 28 have an unresolved violation today, and 3 are designated serious violators by the EPA.
Active systems
423
in 118 counties
People served
5.1M
372 community systems serve 5.1M
Violations, past 3 years
142
34% of active systems
Serious violators
3
2 systems carry a health flag
Largest counties
All 118 countiesLargest community water systems
All 423 systems| System | Serves | Status |
|---|---|---|
| Louisville Water Company Jefferson County |
806,997 | |
| Kentucky-American Water CO Fayette County |
669,042 | |
| Northern Kentucky Water District Kenton County |
259,949 | |
| Warren County Water District Warren County |
91,118 | |
| Hardin County Water District #2 Hardin County |
76,326 | |
| Boone CO Water & Sewer District Boone County |
66,300 | |
| Paducah Water Works McCracken County |
65,004 | |
| Owensboro Municipal Utilities Daviess County |
60,473 | |
| Bowling Green Municipal Utilities Warren County |
53,601 | |
| Frankfort Plant Board Franklin County |
52,153 |
About the Kentucky data
Retrieved from EPA ECHO on Oct 11, 2026. EPA records for Kentucky systems do not include town names, so searches here match on ZIP code, street address, or county.