We analyzed tap water quality data for hundreds of cities in Kentucky to identify the 25 with the most contaminants exceeding health guidelines. This ranking is based on 2026 data from the EPA and EWG databases.
While all public water systems must meet EPA legal limits, many health experts — including the Environmental Working Group — argue that these legal limits are outdated and don't reflect current scientific understanding of safe exposure levels. The cities below have the widest gap between what's in their water and what's considered safe by modern health standards.
Rankings at a Glance
Fort Campbell, Kentucky
Fort Campbell has 15 contaminants exceeding EWG health guidelines out of 25 detected — significantly above the national average. Multiple known carcinogens were found at levels of concern.
See full Fort Campbell water report →Elizabethtown, Kentucky
Elizabethtown has 10 contaminants exceeding EWG health guidelines out of 24 detected — significantly above the national average. Multiple known carcinogens were found at levels of concern.
See full Elizabethtown water report →Georgetown, Kentucky
Georgetown has 10 contaminants exceeding EWG health guidelines out of 23 detected — significantly above the national average. Multiple known carcinogens were found at levels of concern.
See full Georgetown water report →Ashland, Kentucky
Ashland has 10 contaminants exceeding EWG health guidelines out of 19 detected — significantly above the national average. Multiple known carcinogens were found at levels of concern.
See full Ashland water report →Louisville, Kentucky
Louisville has 9 contaminants exceeding EWG health guidelines out of 26 total detected, placing it among the most concerning water supplies analyzed.
See full Louisville water report →Mt Washington, Kentucky
Mt Washington has 9 contaminants exceeding EWG health guidelines out of 26 total detected, placing it among the most concerning water supplies analyzed.
See full Mt Washington water report →Taylorsville, Kentucky
Taylorsville has 9 contaminants exceeding EWG health guidelines out of 26 total detected, placing it among the most concerning water supplies analyzed.
See full Taylorsville water report →Lebanon Junction, Kentucky
Lebanon Junction has 9 contaminants exceeding EWG health guidelines out of 26 total detected, placing it among the most concerning water supplies analyzed.
See full Lebanon Junction water report →Paducah, Kentucky
Paducah has 9 contaminants exceeding EWG health guidelines out of 24 total detected, placing it among the most concerning water supplies analyzed.
See full Paducah water report →Maysville, Kentucky
Maysville has 9 contaminants exceeding EWG health guidelines out of 21 total detected, placing it among the most concerning water supplies analyzed.
See full Maysville water report →Owensboro, Kentucky
Owensboro has 9 contaminants exceeding EWG health guidelines out of 18 total detected, placing it among the most concerning water supplies analyzed.
See full Owensboro water report →South Shore, Kentucky
South Shore has 9 contaminants exceeding EWG health guidelines out of 15 total detected, placing it among the most concerning water supplies analyzed.
See full South Shore water report →Lexington, Kentucky
Lexington has 8 contaminants exceeding EWG health guidelines out of 22 total detected, placing it among the most concerning water supplies analyzed.
See full Lexington water report →Midway, Kentucky
Midway has 8 contaminants exceeding EWG health guidelines out of 22 total detected, placing it among the most concerning water supplies analyzed.
See full Midway water report →Hartford, Kentucky
Hartford has 8 contaminants exceeding EWG health guidelines out of 18 total detected, placing it among the most concerning water supplies analyzed.
See full Hartford water report →Knottsville, Kentucky
Knottsville has 8 contaminants exceeding EWG health guidelines out of 18 total detected, placing it among the most concerning water supplies analyzed.
See full Knottsville water report →Fordsville, Kentucky
Fordsville has 8 contaminants exceeding EWG health guidelines out of 18 total detected, placing it among the most concerning water supplies analyzed.
See full Fordsville water report →Henderson, Kentucky
Henderson has 8 contaminants exceeding EWG health guidelines out of 17 total detected, placing it among the most concerning water supplies analyzed.
See full Henderson water report →Lawrenceburg, Kentucky
Lawrenceburg has 8 contaminants exceeding EWG health guidelines out of 17 total detected, placing it among the most concerning water supplies analyzed.
See full Lawrenceburg water report →Morganfield, Kentucky
Morganfield has 8 contaminants exceeding EWG health guidelines out of 17 total detected, placing it among the most concerning water supplies analyzed.
See full Morganfield water report →Winchester, Kentucky
Winchester has 8 contaminants exceeding EWG health guidelines out of 16 total detected, placing it among the most concerning water supplies analyzed.
See full Winchester water report →Shelbyville, Kentucky
Shelbyville has 8 contaminants exceeding EWG health guidelines out of 13 total detected, placing it among the most concerning water supplies analyzed.
See full Shelbyville water report →Corbin, Kentucky
Corbin has 7 contaminants exceeding EWG health guidelines out of 20 total detected, placing it among the most concerning water supplies analyzed.
See full Corbin water report →Ft Thomas, Kentucky
Ft Thomas has 7 contaminants exceeding EWG health guidelines out of 19 total detected, placing it among the most concerning water supplies analyzed.
See full Ft Thomas water report →Walton, Kentucky
Walton has 7 contaminants exceeding EWG health guidelines out of 19 total detected, placing it among the most concerning water supplies analyzed.
See full Walton water report →What We Found: Key Patterns
The most frequently detected contaminants exceeding health guidelines across these cities are Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Chromium (hexavalent). These appear repeatedly across different water systems and regions.
Water quality varies significantly even within the same state, driven by local geology, agricultural activity, and industrial proximity.
Across all ranked cities, 218 contaminant readings exceed EWG health guidelines, but only 7 exceed EPA legal limits. This gap of 211 highlights how legal standards may not fully protect public health — EPA limits haven't been updated for many contaminants in decades.
Full Rankings Table
| Rank | City | State | Detected | Above Guidelines | Above Legal | People Served |
|---|---|---|---|---|---|---|
| 1 | Fort Campbell | KY | 25 | 15 | 3 | 22,000 |
| 2 | Elizabethtown | KY | 24 | 10 | 0 | 76,326 |
| 3 | Georgetown | KY | 23 | 10 | 1 | 35,714 |
| 4 | Ashland | KY | 19 | 10 | 0 | 44,402 |
| 5 | Louisville | KY | 26 | 9 | 0 | 764,769 |
| 6 | Mt Washington | KY | 26 | 9 | 0 | 23,760 |
| 7 | Taylorsville | KY | 26 | 9 | 0 | 18,973 |
| 8 | Lebanon Junction | KY | 26 | 9 | 0 | 2,866 |
| 9 | Paducah | KY | 24 | 9 | 1 | 65,004 |
| 10 | Maysville | KY | 21 | 9 | 0 | 11,263 |
| 11 | Owensboro | KY | 18 | 9 | 0 | 60,651 |
| 12 | South Shore | KY | 15 | 9 | 2 | 6,798 |
| 13 | Lexington | KY | 22 | 8 | 0 | 299,501 |
| 14 | Midway | KY | 22 | 8 | 0 | 2,174 |
| 15 | Hartford | KY | 18 | 8 | 0 | 16,511 |
| 16 | Knottsville | KY | 18 | 8 | 0 | 12,587 |
| 17 | Fordsville | KY | 18 | 8 | 0 | 927 |
| 18 | Henderson | KY | 17 | 8 | 0 | 31,705 |
| 19 | Lawrenceburg | KY | 17 | 8 | 0 | 14,748 |
| 20 | Morganfield | KY | 17 | 8 | 0 | 6,117 |
| 21 | Winchester | KY | 16 | 8 | 0 | 29,823 |
| 22 | Shelbyville | KY | 13 | 8 | 0 | 23,760 |
| 23 | Corbin | KY | 20 | 7 | 0 | 16,065 |
| 24 | Ft Thomas | KY | 19 | 7 | 0 | 199,460 |
| 25 | Walton | KY | 19 | 7 | 0 | 4,173 |
Frequently Asked Questions
What city has the worst tap water in Kentucky?
Based on 2026 data, Fort Campbell, KY has the most contaminants exceeding EWG health guidelines among the cities we analyzed.
How are cities ranked in this report?
Cities are ranked by the number of contaminants exceeding EWG health guidelines. These guidelines are typically stricter than EPA legal limits and reflect current scientific research on safe exposure levels.
Is my tap water safe if my city isn't on this list?
Not necessarily. Even cities not on this list may have contaminants of concern. We recommend checking your specific water quality using our free water scan tool.
What's the best water filter for contaminated water?
A reverse osmosis (RO) system is the most effective for removing the widest range of contaminants. For whole-home protection, a combination of RO for drinking water and a whole-home filter for showers and baths is recommended.
Related Reports
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: April 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
