Water quality by county
in North Dakota
EPA sampled public water systems across North Dakota for PFAS under its UCMR 5 programme. Of the 53 counties, 0 have a reading above a federal limit and 35 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 |
|---|---|---|---|
| Adams County | 2,141 | not sampled | — |
| Barnes County | 10,798 | under the limit | — |
| Benson County | 5,756 | not sampled | — |
| Billings County | 1,063 | not sampled | — |
| Bottineau County | 6,391 | not sampled | — |
| Bowman County | 2,886 | not sampled | — |
| Burke County | 2,154 | not sampled | — |
| Burleigh County | 103,107 | under the limit | — |
| Cass County | 200,945 | under the limit | — |
| Cavalier County | 3,567 | not sampled | — |
| Dickey County | 4,930 | not sampled | — |
| Divide County | 2,124 | not sampled | — |
| Dunn County | 4,031 | not sampled | — |
| Eddy County | 2,309 | not sampled | — |
| Emmons County | 3,209 | under the limit | — |
| Foster County | 3,323 | not sampled | — |
| Golden Valley County | 1,795 | under the limit | — |
| Grand Forks County | 73,771 | under the limit | — |
| Grant County | 2,247 | not sampled | — |
| Griggs County | 2,227 | not sampled | — |
| Hettinger County | 2,419 | not sampled | — |
| Kidder County | 2,371 | not sampled | — |
| LaMoure County | 4,051 | not sampled | — |
| Logan County | 1,880 | not sampled | — |
| McHenry County | 5,135 | not sampled | — |
| McIntosh County | 2,461 | not sampled | — |
| McKenzie County | 14,782 | under the limit | — |
| McLean County | 9,845 | not sampled | — |
| Mercer County | 8,348 | under the limit | — |
| Morton County | 34,194 | under the limit | — |
| Mountrail County | 9,474 | not sampled | — |
| Nelson County | 3,007 | not sampled | — |
| Oliver County | 1,882 | not sampled | — |
| Pembina County | 6,588 | under the limit | — |
| Pierce County | 3,853 | not sampled | — |
| Ramsey County | 11,510 | under the limit | — |
| Ransom County | 5,590 | not sampled | — |
| Renville County | 2,376 | not sampled | — |
| Richland County | 16,658 | under the limit | — |
| Rolette County | 11,692 | not sampled | — |
| Sargent County | 3,710 | not sampled | — |
| Sheridan County | 1,268 | not sampled | — |
| Sioux County | 3,713 | not sampled | — |
| Slope County | 660 | not sampled | — |
| Stark County | 33,767 | under the limit | — |
| Steele County | 1,767 | not sampled | — |
| Stutsman County | 21,546 | under the limit | — |
| Towner County | 2,051 | not sampled | — |
| Traill County | 7,989 | not sampled | — |
| Walsh County | 10,214 | under the limit | — |
| Ward County | 68,427 | under the limit | — |
| Wells County | 3,803 | under the limit | — |
| Williams County | 40,763 | under the limit | — |