Water quality by county
in Minnesota
EPA sampled public water systems across Minnesota for PFAS under its UCMR 5 programme. Of the 87 counties, 11 have a reading above a federal limit and 18 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 |
|---|---|---|---|
| Dakota County | 453,156 | 5.9× | PFOA · 23.7 ng/L |
| Stearns County | 163,997 | 4.5× | PFOS · 18 ng/L |
| Washington County | 283,960 | 4.3× | PFOA · 17.1 ng/L |
| Benton County | 41,881 | 3.4× | PFHxS · 34.2 ng/L |
| Hennepin County | 1,273,334 | 2.6× | PFOA · 10.5 ng/L |
| Carlton County | 36,745 | 2.1× | PFOS · 8.4 ng/L |
| Mille Lacs County | 27,577 | 1.2× | PFOS · 4.9 ng/L |
| Ramsey County | 542,015 | 1.1× | PFOA · 4.6 ng/L |
| Sherburne County | 103,059 | 1.1× | PFOS · 4.6 ng/L |
| Anoka County | 376,840 | 1.1× | PFHxS · 11.4 ng/L |
| Douglas County | 39,933 | 1.1× | PFOS · 4.4 ng/L |
| Wright County | 154,593 | under the limit | PFHxS · 5.8 ng/L |
| Lyon County | 25,577 | under the limit | PFHxS · 4.7 ng/L |
| Olmsted County | 166,424 | under the limit | PFHxS · 3.9 ng/L |
| Aitkin County | 16,335 | not sampled | — |
| Becker County | 35,444 | under the limit | — |
| Beltrami County | 46,762 | under the limit | — |
| Big Stone County | 5,067 | under the limit | — |
| Blue Earth County | 70,700 | under the limit | — |
| Brown County | 25,710 | under the limit | — |
| Carver County | 112,628 | under the limit | — |
| Cass County | 31,442 | not sampled | — |
| Chippewa County | 12,299 | under the limit | — |
| Chisago County | 59,105 | under the limit | — |
| Clay County | 66,848 | under the limit | — |
| Clearwater County | 8,630 | not sampled | — |
| Cook County | 5,571 | not sampled | — |
| Cottonwood County | 11,338 | under the limit | — |
| Crow Wing County | 68,642 | under the limit | — |
| Dodge County | 21,242 | under the limit | — |
| Faribault County | 13,886 | under the limit | — |
| Fillmore County | 21,502 | under the limit | — |
| Freeborn County | 30,314 | under the limit | — |
| Goodhue County | 47,982 | under the limit | — |
| Grant County | 6,109 | not sampled | — |
| Houston County | 18,352 | under the limit | — |
| Hubbard County | 22,050 | under the limit | — |
| Isanti County | 43,687 | under the limit | — |
| Itasca County | 45,442 | under the limit | — |
| Jackson County | 9,861 | under the limit | — |
| Kanabec County | 16,608 | under the limit | — |
| Kandiyohi County | 44,674 | under the limit | — |
| Kittson County | 3,992 | not sampled | — |
| Koochiching County | 11,594 | under the limit | — |
| Lac qui Parle County | 6,636 | under the limit | — |
| Lake County | 10,698 | under the limit | — |
| Lake of the Woods County | 3,797 | not sampled | — |
| Le Sueur County | 29,458 | under the limit | — |
| Lincoln County | 5,564 | under the limit | — |
| Mahnomen County | 5,296 | not sampled | — |
| Marshall County | 8,771 | not sampled | — |
| Martin County | 19,561 | under the limit | — |
| McLeod County | 36,780 | under the limit | — |
| Meeker County | 23,491 | under the limit | — |
| Morrison County | 34,520 | under the limit | — |
| Mower County | 40,900 | under the limit | — |
| Murray County | 8,044 | not sampled | — |
| Nicollet County | 34,493 | under the limit | — |
| Nobles County | 21,969 | under the limit | — |
| Norman County | 6,284 | not sampled | — |
| Otter Tail County | 60,884 | under the limit | — |
| Pennington County | 13,652 | under the limit | — |
| Pine County | 30,319 | not sampled | — |
| Pipestone County | 9,100 | under the limit | — |
| Polk County | 30,413 | under the limit | — |
| Pope County | 11,495 | not sampled | — |
| Red Lake County | 3,882 | not sampled | — |
| Redwood County | 15,254 | under the limit | — |
| Renville County | 14,453 | under the limit | — |
| Rice County | 69,025 | under the limit | — |
| Rock County | 9,525 | under the limit | — |
| Roseau County | 15,265 | not sampled | — |
| Scott County | 157,206 | under the limit | — |
| Sibley County | 15,194 | under the limit | — |
| St. Louis County | 200,794 | under the limit | — |
| Steele County | 37,434 | under the limit | — |
| Stevens County | 9,819 | under the limit | — |
| Swift County | 9,666 | not sampled | — |
| Todd County | 25,955 | under the limit | — |
| Traverse County | 3,134 | not sampled | — |
| Wabasha County | 21,574 | under the limit | — |
| Wadena County | 14,437 | under the limit | — |
| Waseca County | 18,684 | under the limit | — |
| Watonwan County | 11,204 | under the limit | — |
| Wilkin County | 6,268 | under the limit | — |
| Winona County | 49,973 | under the limit | — |
| Yellow Medicine County | 9,373 | not sampled | — |