Water quality by county
in Tennessee
EPA sampled public water systems across Tennessee for PFAS under its UCMR 5 programme. Of the 95 counties, 23 have a reading above a federal limit and 2 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 |
|---|---|---|---|
| Hamilton County | 386,256 | 8.8× | PFOA · 35 ng/L |
| Montgomery County | 246,025 | 6.8× | PFOS · 27.3 ng/L |
| Gibson County | 51,422 | 6.8× | PFOS · 27 ng/L |
| Hardin County | 27,617 | 6.5× | PFOS · 25.9 ng/L |
| Benton County | 16,173 | 6.0× | PFOS · 24 ng/L |
| Decatur County | 11,800 | 5.1× | PFOS · 20.3 ng/L |
| Madison County | 100,409 | 5.0× | PFOS · 20 ng/L |
| Wayne County | 15,974 | 4.3× | PFOS · 17 ng/L |
| Coffee County | 61,285 | 3.0× | PFOA · 11.9 ng/L |
| Marshall County | 37,847 | 2.8× | PFOA · 11 ng/L |
| Bedford County | 54,228 | 2.0× | PFOA · 8.2 ng/L |
| Williamson County | 269,136 | 2.0× | PFOA · 8.1 ng/L |
| Henderson County | 28,183 | 2.0× | PFOS · 7.9 ng/L |
| Maury County | 113,411 | 1.8× | PFOA · 7.1 ng/L |
| Unicoi County | 17,872 | 1.7× | PFOS · 6.7 ng/L |
| Wilson County | 169,948 | 1.6× | PFOA · 6.5 ng/L |
| Giles County | 30,971 | 1.6× | PFOS · 6.2 ng/L |
| Bradley County | 113,782 | 1.5× | PFOA · 6 ng/L |
| Rutherford County | 376,996 | 1.5× | PFOA · 6 ng/L |
| Sullivan County | 162,703 | 1.5× | PFOS · 5.9 ng/L |
| Loudon County | 62,129 | 1.1× | PFOS · 4.6 ng/L |
| Jefferson County | 59,217 | 1.1× | PFOS · 4.2 ng/L |
| White County | 29,108 | 1.0× | PFOS · 4.1 ng/L |
| Anderson County | 81,449 | under the limit | — |
| Bledsoe County | 15,591 | under the limit | — |
| Blount County | 142,211 | under the limit | — |
| Campbell County | 40,238 | under the limit | — |
| Cannon County | 15,142 | under the limit | — |
| Carroll County | 29,107 | under the limit | — |
| Carter County | 57,434 | under the limit | — |
| Cheatham County | 42,604 | under the limit | — |
| Chester County | 17,876 | under the limit | — |
| Claiborne County | 33,070 | under the limit | — |
| Clay County | 7,857 | under the limit | — |
| Cocke County | 37,596 | under the limit | — |
| Crockett County | 13,973 | under the limit | — |
| Cumberland County | 65,618 | under the limit | — |
| Davidson County | 729,505 | under the limit | — |
| DeKalb County | 21,747 | under the limit | — |
| Dickson County | 57,641 | under the limit | — |
| Dyer County | 36,403 | under the limit | — |
| Fayette County | 44,476 | under the limit | — |
| Fentress County | 20,129 | under the limit | — |
| Franklin County | 45,137 | under the limit | — |
| Grainger County | 25,073 | under the limit | — |
| Greene County | 73,398 | under the limit | — |
| Grundy County | 14,148 | under the limit | — |
| Hamblen County | 67,715 | under the limit | — |
| Hancock County | 7,038 | not sampled | — |
| Hardeman County | 25,434 | under the limit | — |
| Hawkins County | 59,371 | under the limit | — |
| Haywood County | 17,097 | under the limit | — |
| Henry County | 32,883 | under the limit | — |
| Hickman County | 25,859 | under the limit | — |
| Houston County | 8,538 | under the limit | — |
| Humphreys County | 19,554 | under the limit | — |
| Jackson County | 12,376 | not sampled | — |
| Johnson County | 18,506 | under the limit | — |
| Knox County | 506,748 | under the limit | — |
| Lake County | 6,422 | under the limit | — |
| Lauderdale County | 24,630 | under the limit | — |
| Lawrence County | 46,467 | under the limit | — |
| Lewis County | 13,418 | under the limit | — |
| Lincoln County | 36,751 | under the limit | — |
| Macon County | 27,189 | under the limit | — |
| Marion County | 29,826 | under the limit | — |
| McMinn County | 56,754 | under the limit | — |
| McNairy County | 26,103 | under the limit | — |
| Meigs County | 13,937 | under the limit | — |
| Monroe County | 49,154 | under the limit | — |
| Moore County | 6,773 | under the limit | — |
| Morgan County | 21,954 | under the limit | — |
| Obion County | 30,261 | under the limit | — |
| Overton County | 23,551 | under the limit | — |
| Perry County | 8,987 | under the limit | — |
| Pickett County | 5,108 | under the limit | — |
| Polk County | 18,338 | under the limit | — |
| Putnam County | 84,894 | under the limit | — |
| Rhea County | 34,759 | under the limit | — |
| Roane County | 56,742 | under the limit | — |
| Robertson County | 78,459 | under the limit | — |
| Scott County | 22,517 | under the limit | — |
| Sequatchie County | 17,620 | under the limit | — |
| Sevier County | 100,184 | under the limit | — |
| Shelby County | 910,530 | under the limit | — |
| Smith County | 20,783 | under the limit | — |
| Stewart County | 14,365 | under the limit | — |
| Sumner County | 211,721 | under the limit | — |
| Tipton County | 62,187 | under the limit | — |
| Trousdale County | 12,159 | under the limit | — |
| Union County | 21,064 | under the limit | — |
| Van Buren County | 6,686 | under the limit | — |
| Warren County | 43,619 | under the limit | — |
| Washington County | 139,642 | under the limit | — |
| Weakley County | 33,162 | under the limit | — |