Water quality by county
in Michigan
EPA sampled public water systems across Michigan for PFAS under its UCMR 5 programme. Of the 83 counties, 7 have a reading above a federal limit and 19 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 |
|---|---|---|---|
| Monroe County | 156,045 | 3.3× | PFOA · 13 ng/L |
| Oakland County | 1,296,888 | 3.0× | PFHxS · 30 ng/L |
| Delta County | 36,687 | 2.8× | PFOS · 11 ng/L |
| Kalamazoo County | 264,780 | 1.7× | PFOS · 6.7 ng/L |
| Ottawa County | 306,235 | 1.2× | PFOA · 4.8 ng/L |
| Newaygo County | 51,504 | 1.2× | PFOA · 4.7 ng/L |
| Allegan County | 122,429 | 1.0× | PFOA · 4 ng/L |
| Chippewa County | 36,253 | under the limit | PFHxS · 9.3 ng/L |
| Dickinson County | 25,995 | under the limit | PFHxS · 8 ng/L |
| Macomb County | 886,175 | under the limit | PFNA · 4.8 ng/L |
| Eaton County | 109,494 | under the limit | PFHxS · 3 ng/L |
| Alcona County | 10,624 | not sampled | — |
| Alger County | 8,695 | not sampled | — |
| Alpena County | 28,903 | under the limit | — |
| Antrim County | 24,536 | under the limit | — |
| Arenac County | 15,087 | under the limit | — |
| Baraga County | 8,169 | not sampled | — |
| Barry County | 64,025 | under the limit | — |
| Bay County | 102,651 | under the limit | — |
| Benzie County | 18,520 | not sampled | — |
| Berrien County | 152,703 | under the limit | — |
| Branch County | 46,187 | under the limit | — |
| Calhoun County | 133,785 | under the limit | — |
| Cass County | 51,550 | under the limit | — |
| Charlevoix County | 26,105 | under the limit | — |
| Cheboygan County | 25,964 | under the limit | — |
| Clare County | 31,405 | not sampled | — |
| Clinton County | 80,050 | under the limit | — |
| Crawford County | 13,599 | not sampled | — |
| Emmet County | 33,949 | under the limit | — |
| Genesee County | 402,279 | under the limit | — |
| Gladwin County | 25,995 | not sampled | — |
| Gogebic County | 14,217 | under the limit | — |
| Grand Traverse County | 96,625 | under the limit | — |
| Gratiot County | 41,372 | under the limit | — |
| Hillsdale County | 45,590 | under the limit | — |
| Houghton County | 38,041 | under the limit | — |
| Huron County | 30,780 | under the limit | — |
| Ingham County | 290,427 | under the limit | — |
| Ionia County | 66,250 | under the limit | — |
| Iosco County | 25,361 | under the limit | — |
| Iron County | 11,709 | not sampled | — |
| Isabella County | 65,072 | under the limit | — |
| Jackson County | 160,233 | under the limit | — |
| Kalkaska County | 18,618 | not sampled | — |
| Kent County | 673,002 | under the limit | — |
| Keweenaw County | 2,161 | not sampled | — |
| Lake County | 13,005 | not sampled | — |
| Lapeer County | 89,168 | under the limit | — |
| Leelanau County | 22,871 | not sampled | — |
| Lenawee County | 97,746 | under the limit | — |
| Livingston County | 196,976 | under the limit | — |
| Luce County | 6,328 | not sampled | — |
| Mackinac County | 11,144 | under the limit | — |
| Manistee County | 25,519 | under the limit | — |
| Marquette County | 67,979 | under the limit | — |
| Mason County | 29,093 | under the limit | — |
| Mecosta County | 41,947 | under the limit | — |
| Menominee County | 23,050 | under the limit | — |
| Midland County | 84,022 | under the limit | — |
| Missaukee County | 15,239 | not sampled | — |
| Montcalm County | 69,314 | under the limit | — |
| Montmorency County | 9,828 | not sampled | — |
| Muskegon County | 177,428 | under the limit | — |
| Oceana County | 27,014 | not sampled | — |
| Ogemaw County | 20,985 | under the limit | — |
| Ontonagon County | 5,824 | under the limit | — |
| Osceola County | 23,484 | under the limit | — |
| Oscoda County | 8,596 | under the limit | — |
| Otsego County | 26,083 | under the limit | — |
| Presque Isle County | 13,230 | not sampled | — |
| Roscommon County | 23,932 | not sampled | — |
| Saginaw County | 187,714 | under the limit | — |
| Sanilac County | 40,293 | under the limit | — |
| Schoolcraft County | 8,178 | not sampled | — |
| Shiawassee County | 67,982 | under the limit | — |
| St. Clair County | 160,308 | under the limit | — |
| St. Joseph County | 61,171 | under the limit | — |
| Tuscola County | 52,757 | under the limit | — |
| Van Buren County | 76,129 | under the limit | — |
| Washtenaw County | 373,875 | under the limit | — |
| Wayne County | 1,771,063 | under the limit | — |
| Wexford County | 34,460 | under the limit | — |