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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Compare water quality across 22 counties in Kentucky
22 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Warren County | 100 | A | 1 | 53,601 | 100 - 100 |
| 2 | Barren County | 100 | A | 1 | 36,766 | 100 - 100 |
| 3 | Jessamine County | 100 | A | 1 | 35,266 | 100 - 100 |
| 4 | Boyle County | 100 | A | 1 | 32,600 | 100 - 100 |
| 5 | Henderson County | 100 | A | 1 | 31,705 | 100 - 100 |
| 6 | Clark County | 100 | A | 1 | 29,823 | 100 - 100 |
| 7 | Boone County | 100 | A | 1 | 29,351 | 100 - 100 |
| 8 | Calloway County | 100 | A | 1 | 26,302 | 100 - 100 |
| 9 | Campbell County | 98 | A | 1 | 259,949 | 98 - 98 |
| 10 | Franklin County | 98 | A | 1 | 52,153 | 98 - 98 |
| 11 | Hopkins County | 98 | A | 1 | 28,102 | 98 - 98 |
| 12 | Shelby County | 98 | A | 1 | 23,760 | 98 - 98 |
| 13 | Nelson County | 97 | A | 1 | 31,185 | 97 - 97 |
| 14 | Fayette County | 94 | A | 1 | 669,042 | 94 - 94 |
| 15 | Christian County | 94 | A | 1 | 41,350 | 94 - 94 |
| 16 | Daviess County | 90 | A | 1 | 60,473 | 90 - 90 |
| 17 | Madison County | 90 | A | 1 | 35,640 | 90 - 90 |
| 18 | Boyd County | 88 | B | 1 | 44,402 | 88 - 88 |
| 19 | Hardin County | 86 | B | 2 | 106,556 | 71 - 100 |
| 20 | Jefferson County | 84 | B | 1 | 806,997 | 84 - 84 |
| 21 | McCracken County | 74 | C | 1 | 65,004 | 74 - 74 |
| 22 | Scott County | 71 | C | 1 | 44,608 | 71 - 71 |
1 cities • 669,042 residents
1 cities • 806,997 residents
See all 22 counties in the ranking table above
Our county-level water quality analysis aggregates data from municipal water systems across Kentucky. Each county's score represents the average water quality across all analyzed cities within that county, weighted by population served.
With 22 counties and 23 cities analyzed, this data helps residents understand regional water quality patterns in Kentucky. County scores range from 71/100 to 100/100, reflecting the diversity of water sources and treatment infrastructure across the state.
All analyzed counties in Kentucky maintain average scores above 70, indicating generally acceptable water quality standards statewide. Individual city scores may vary, so residents should still review their specific city's report.