Water quality by county
in Indiana
EPA sampled public water systems across Indiana for PFAS under its UCMR 5 programme. Of the 92 counties, 14 have a reading above a federal limit and 9 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 |
|---|---|---|---|
| Clark County | 127,479 | 3.6× | PFOA · 14.5 ng/L |
| Brown County | 15,650 | 3.2× | PFOA · 12.9 ng/L |
| St. Joseph County | 273,744 | 2.6× | PFHxS · 25.6 ng/L |
| Pike County | 12,116 | 2.0× | PFOA · 7.9 ng/L |
| Floyd County | 81,931 | 1.8× | PFOA · 7.2 ng/L |
| Vigo County | 106,166 | 1.8× | PFOS · 7.1 ng/L |
| Harrison County | 39,978 | 1.6× | PFOA · 6.5 ng/L |
| Jefferson County | 32,921 | 1.6× | PFOA · 6.3 ng/L |
| Jackson County | 47,420 | 1.5× | PFOA · 6 ng/L |
| Elkhart County | 207,436 | 1.3× | PFOA · 5.2 ng/L |
| Gibson County | 33,038 | 1.2× | PFOA · 4.9 ng/L |
| Perry County | 19,320 | 1.1× | PFOA · 4.3 ng/L |
| Madison County | 134,222 | 1.0× | PFOS · 4.1 ng/L |
| Posey County | 25,067 | 1.0× | PFOA · 4 ng/L |
| Tippecanoe County | 191,650 | under the limit | PFHxS · 6.8 ng/L |
| Vermillion County | 15,516 | under the limit | PFHxS · 5.6 ng/L |
| Adams County | 36,584 | under the limit | — |
| Allen County | 399,295 | under the limit | — |
| Bartholomew County | 84,741 | under the limit | — |
| Benton County | 8,853 | not sampled | — |
| Blackford County | 11,816 | under the limit | — |
| Boone County | 78,773 | under the limit | — |
| Carroll County | 20,747 | not sampled | — |
| Cass County | 37,559 | under the limit | — |
| Clay County | 26,424 | under the limit | — |
| Clinton County | 32,895 | under the limit | — |
| Crawford County | 10,523 | not sampled | — |
| Daviess County | 34,097 | under the limit | — |
| Dearborn County | 51,435 | under the limit | — |
| Decatur County | 26,421 | under the limit | — |
| DeKalb County | 44,330 | under the limit | — |
| Delaware County | 112,951 | under the limit | — |
| Dubois County | 43,629 | under the limit | — |
| Fayette County | 23,335 | under the limit | — |
| Fountain County | 16,833 | not sampled | — |
| Franklin County | 23,136 | under the limit | — |
| Fulton County | 20,004 | under the limit | — |
| Grant County | 66,458 | under the limit | — |
| Greene County | 31,219 | under the limit | — |
| Hamilton County | 379,704 | under the limit | — |
| Hancock County | 88,810 | under the limit | — |
| Hendricks County | 190,629 | under the limit | — |
| Henry County | 49,081 | under the limit | — |
| Howard County | 84,082 | under the limit | — |
| Huntington County | 36,944 | under the limit | — |
| Jasper County | 33,387 | under the limit | — |
| Jay County | 20,164 | under the limit | — |
| Jennings County | 27,634 | under the limit | — |
| Johnson County | 170,614 | under the limit | — |
| Knox County | 35,872 | under the limit | — |
| Kosciusko County | 80,669 | under the limit | — |
| LaGrange County | 41,122 | not sampled | — |
| Lake County | 502,955 | under the limit | — |
| LaPorte County | 111,348 | under the limit | — |
| Lawrence County | 45,192 | under the limit | — |
| Marion County | 981,628 | under the limit | — |
| Marshall County | 46,464 | under the limit | — |
| Martin County | 9,864 | under the limit | — |
| Miami County | 35,613 | under the limit | — |
| Monroe County | 140,702 | under the limit | — |
| Montgomery County | 38,633 | under the limit | — |
| Morgan County | 73,825 | under the limit | — |
| Newton County | 14,131 | not sampled | — |
| Noble County | 47,811 | under the limit | — |
| Ohio County | 5,996 | under the limit | — |
| Orange County | 19,824 | under the limit | — |
| Owen County | 21,851 | under the limit | — |
| Parke County | 16,508 | under the limit | — |
| Porter County | 175,860 | under the limit | — |
| Pulaski County | 12,421 | not sampled | — |
| Putnam County | 37,804 | under the limit | — |
| Randolph County | 24,337 | under the limit | — |
| Ripley County | 29,214 | under the limit | — |
| Rush County | 16,759 | under the limit | — |
| Scott County | 24,751 | under the limit | — |
| Shelby County | 45,654 | under the limit | — |
| Spencer County | 20,192 | under the limit | — |
| Starke County | 23,463 | under the limit | — |
| Steuben County | 34,862 | under the limit | — |
| Sullivan County | 20,768 | under the limit | — |
| Switzerland County | 9,988 | under the limit | — |
| Tipton County | 15,324 | under the limit | — |
| Union County | 6,884 | not sampled | — |
| Vanderburgh County | 180,387 | under the limit | — |
| Wabash County | 30,777 | under the limit | — |
| Warren County | 8,451 | not sampled | — |
| Warrick County | 66,339 | under the limit | — |
| Washington County | 28,345 | under the limit | — |
| Wayne County | 66,410 | under the limit | — |
| Wells County | 28,798 | under the limit | — |
| White County | 24,833 | under the limit | — |
| Whitley County | 34,885 | under the limit | — |