Water quality by county
in Kentucky
EPA sampled public water systems across Kentucky for PFAS under its UCMR 5 programme. Of the 120 counties, 20 have a reading above a federal limit and 8 have not been sampled at all — which is not a clean result, only an absence of one. Each county below shows what was found, at what concentration, and at which utility.
| county | Population | Worst result | Compound |
|---|---|---|---|
| Harrison County | 19,525 | 12× | PFOS · 47.9 ng/L |
| Scott County | 61,700 | 3.0× | PFOS · 12 ng/L |
| Union County | 13,178 | 2.7× | PFOA · 10.8 ng/L |
| Boyd County | 47,777 | 2.5× | HFPO-DA · 25 ng/L |
| Whitley County | 37,233 | 2.5× | PFOA · 10 ng/L |
| McCracken County | 67,550 | 2.0× | PFOS · 8.1 ng/L |
| Jefferson County | 793,881 | 1.9× | PFOA · 7.5 ng/L |
| Livingston County | 8,815 | 1.8× | PFOS · 7.3 ng/L |
| Bullitt County | 85,802 | 1.8× | PFOA · 7.2 ng/L |
| Daviess County | 104,457 | 1.6× | PFOA · 6.5 ng/L |
| Greenup County | 35,273 | 1.6× | PFOA · 6.5 ng/L |
| Spencer County | 20,823 | 1.6× | PFOA · 6.5 ng/L |
| Hardin County | 112,826 | 1.6× | PFOA · 6.2 ng/L |
| Nelson County | 48,706 | 1.4× | PFOA · 5.7 ng/L |
| Lee County | 7,313 | 1.4× | PFOA · 5.4 ng/L |
| Mason County | 16,956 | 1.3× | PFOA · 5 ng/L |
| Carroll County | 11,111 | 1.2× | PFHxS · 12 ng/L |
| Shelby County | 50,124 | 1.1× | PFOA · 4.6 ng/L |
| Lyon County | 9,078 | 1.1× | PFOS · 4.4 ng/L |
| Pendleton County | 14,844 | 1.0× | PFOA · 4.1 ng/L |
| Clay County | 19,592 | under the limit | PFHxS · 7 ng/L |
| Boone County | 144,135 | under the limit | HFPO-DA · 6.8 ng/L |
| Bracken County | 8,497 | under the limit | PFHxS · 5.5 ng/L |
| Adair County | 19,239 | under the limit | — |
| Allen County | 22,037 | under the limit | — |
| Anderson County | 24,883 | under the limit | — |
| Ballard County | 7,626 | not sampled | — |
| Barren County | 45,609 | under the limit | — |
| Bath County | 12,951 | under the limit | — |
| Bell County | 23,051 | under the limit | — |
| Bourbon County | 20,333 | under the limit | — |
| Boyle County | 31,394 | under the limit | — |
| Breathitt County | 12,804 | under the limit | — |
| Breckinridge County | 21,221 | under the limit | — |
| Butler County | 12,551 | under the limit | — |
| Caldwell County | 12,611 | under the limit | — |
| Calloway County | 38,975 | under the limit | — |
| Campbell County | 94,008 | not sampled | — |
| Carlisle County | 4,777 | under the limit | — |
| Carter County | 26,098 | under the limit | — |
| Casey County | 15,948 | under the limit | — |
| Christian County | 71,006 | under the limit | — |
| Clark County | 37,673 | under the limit | — |
| Clinton County | 9,183 | under the limit | — |
| Crittenden County | 8,982 | not sampled | — |
| Cumberland County | 6,047 | under the limit | — |
| Edmonson County | 12,635 | under the limit | — |
| Elliott County | 7,263 | under the limit | — |
| Estill County | 14,002 | under the limit | — |
| Fayette County | 329,437 | under the limit | — |
| Fleming County | 15,591 | under the limit | — |
| Floyd County | 34,532 | under the limit | — |
| Franklin County | 52,442 | under the limit | — |
| Fulton County | 6,282 | under the limit | — |
| Gallatin County | 8,805 | under the limit | — |
| Garrard County | 18,040 | under the limit | — |
| Grant County | 25,722 | under the limit | — |
| Graves County | 36,821 | under the limit | — |
| Grayson County | 27,070 | under the limit | — |
| Green County | 11,552 | under the limit | — |
| Hancock County | 9,013 | not sampled | — |
| Harlan County | 25,052 | under the limit | — |
| Hart County | 19,923 | under the limit | — |
| Henderson County | 44,175 | under the limit | — |
| Henry County | 16,198 | under the limit | — |
| Hickman County | 4,393 | not sampled | — |
| Hopkins County | 45,218 | under the limit | — |
| Jackson County | 13,358 | under the limit | — |
| Jessamine County | 56,495 | under the limit | — |
| Johnson County | 22,098 | under the limit | — |
| Kenton County | 174,862 | under the limit | — |
| Knott County | 13,438 | under the limit | — |
| Knox County | 29,657 | under the limit | — |
| Larue County | 15,128 | under the limit | — |
| Laurel County | 63,353 | under the limit | — |
| Lawrence County | 15,798 | under the limit | — |
| Leslie County | 9,729 | under the limit | — |
| Letcher County | 20,139 | under the limit | — |
| Lewis County | 12,875 | under the limit | — |
| Lincoln County | 24,910 | under the limit | — |
| Logan County | 28,467 | under the limit | — |
| Madison County | 99,582 | under the limit | — |
| Magoffin County | 11,118 | under the limit | — |
| Marion County | 19,851 | under the limit | — |
| Marshall County | 31,734 | under the limit | — |
| Martin County | 10,696 | under the limit | — |
| McCreary County | 16,824 | under the limit | — |
| McLean County | 9,126 | not sampled | — |
| Meade County | 30,442 | under the limit | — |
| Menifee County | 6,341 | under the limit | — |
| Mercer County | 23,515 | under the limit | — |
| Metcalfe County | 10,558 | under the limit | — |
| Monroe County | 11,163 | under the limit | — |
| Montgomery County | 28,771 | under the limit | — |
| Morgan County | 14,300 | under the limit | — |
| Muhlenberg County | 30,512 | under the limit | — |
| Nicholas County | 7,816 | under the limit | — |
| Ohio County | 23,933 | under the limit | — |
| Oldham County | 70,525 | under the limit | — |
| Owen County | 11,435 | not sampled | — |
| Owsley County | 3,928 | under the limit | — |
| Perry County | 26,739 | under the limit | — |
| Pike County | 55,430 | under the limit | — |
| Powell County | 12,928 | under the limit | — |
| Pulaski County | 66,842 | under the limit | — |
| Robertson County | 2,382 | not sampled | — |
| Rockcastle County | 16,226 | under the limit | — |
| Rowan County | 24,675 | under the limit | — |
| Russell County | 18,458 | under the limit | — |
| Simpson County | 20,350 | under the limit | — |
| Taylor County | 26,809 | under the limit | — |
| Todd County | 12,757 | under the limit | — |
| Trigg County | 14,559 | under the limit | — |
| Trimble County | 8,591 | under the limit | — |
| Warren County | 147,936 | under the limit | — |
| Washington County | 12,269 | under the limit | — |
| Wayne County | 19,629 | under the limit | — |
| Webster County | 12,854 | under the limit | — |
| Wolfe County | 6,364 | under the limit | — |
| Woodford County | 27,728 | under the limit | — |