Michigan water quality by county
83 counties with public water systems. Pick a county to see every system that serves it.
| County | Active systems | People served | Share with violations, 3 yr | Serious violators | Health flags |
|---|---|---|---|---|---|
| Alcona County | 67 | 7,368 | 0 | 0 | |
| Alger County | 86 | 9,894 | 0 | 0 | |
| Allegan County | 319 | 108,286 | 0 | 2 | |
| Alpena County | 47 | 19,518 | 0 | 0 | |
| Antrim County | 118 | 23,853 | 0 | 1 | |
| Arenac County | 69 | 21,189 | 0 | 10 | |
| Baraga County | 23 | 5,580 | 0 | 0 | |
| Barry County | 197 | 47,713 | 7 | 2 | |
| Bay County | 29 | 99,076 | 0 | 0 | |
| Benzie County | 118 | 27,201 | 0 | 0 | |
| Berrien County | 221 | 135,167 | 1 | 1 | |
| Branch County | 82 | 33,257 | 0 | 2 | |
| Calhoun County | 144 | 93,770 | 3 | 2 | |
| Cass County | 149 | 35,578 | 1 | 1 | |
| Charlevoix County | 114 | 28,025 | 0 | 0 | |
| Cheboygan County | 184 | 34,063 | 0 | 4 | |
| Chippewa County | 138 | 39,195 | 0 | 0 | |
| Clare County | 148 | 27,711 | 3 | 4 | |
| Clinton County | 93 | 36,355 | 1 | 1 | |
| Crawford County | 106 | 18,616 | 1 | 2 | |
| Delta County | 70 | 26,500 | 0 | 0 | |
| Dickinson County | 32 | 23,264 | 0 | 0 | |
| Eaton County | 105 | 69,789 | 8 | 2 | |
| Emmet County | 209 | 40,287 | 0 | 0 | |
| Genesee County | 384 | 331,617 | 31 | 9 | |
| Gladwin County | 91 | 12,530 | 1 | 5 | |
| Gogebic County | 44 | 14,287 | 0 | 0 | |
| Grand Traverse County | 223 | 66,902 | 0 | 0 | |
| Gratiot County | 79 | 39,436 | 2 | 1 | |
| Hillsdale County | 102 | 30,793 | 1 | 0 | |
| Houghton County | 46 | 33,702 | 0 | 0 | |
| Huron County | 105 | 33,852 | 0 | 1 | |
| Ingham County | 109 | 279,553 | 3 | 1 | |
| Ionia County | 133 | 47,251 | 1 | 0 | |
| Iosco County | 82 | 24,453 | 0 | 0 | |
| Iron County | 29 | 13,441 | 0 | 0 | |
| Isabella County | 92 | 50,067 | 1 | 1 | |
| Jackson County | 230 | 131,073 | 1 | 0 | |
| Kalamazoo County | 196 | 287,440 | 1 | 1 | |
| Kalkaska County | 88 | 9,682 | 3 | 3 | |
| Kent County | 417 | 666,342 | 1 | 0 | |
| Keweenaw County | 19 | 2,758 | 0 | 0 | |
| Lake County | 80 | 7,876 | 1 | 3 | |
| Lapeer County | 239 | 49,147 | 0 | 1 | |
| Leelanau County | 151 | 30,102 | 1 | 1 | |
| Lenawee County | 197 | 82,557 | 2 | 0 | |
| Livingston County | 437 | 137,052 | 2 | 2 | |
| Luce County | 53 | 7,391 | 1 | 0 | |
| Mackinac County | 118 | 12,643 | 0 | 1 | |
| Macomb County | 89 | 830,786 | 0 | 0 | |
| Manistee County | 98 | 20,863 | 1 | 2 | |
| Marquette County | 105 | 57,749 | 0 | 1 | |
| Mason County | 90 | 24,638 | 1 | 0 | |
| Mecosta County | 174 | 36,694 | 2 | 2 | |
| Menominee County | 44 | 17,142 | 0 | 1 | |
| Midland County | 34 | 67,286 | 2 | 0 | |
| Missaukee County | 52 | 7,143 | 1 | 4 | |
| Monroe County | 77 | 139,251 | 0 | 0 | |
| Montcalm County | 159 | 49,486 | 8 | 1 | |
| Montmorency County | 56 | 7,778 | 0 | 0 | |
| Muskegon County | 219 | 154,604 | 1 | 0 | |
| Newaygo County | 153 | 33,607 | 1 | 4 | |
| Oakland County | 729 | 1,157,537 | 2 | 4 | |
| Oceana County | 138 | 35,569 | 1 | 0 | |
| Ogemaw County | 118 | 19,944 | 0 | 0 | |
| Ontonagon County | 26 | 5,345 | 0 | 0 | |
| Osceola County | 96 | 24,957 | 2 | 0 | |
| Oscoda County | 67 | 7,439 | 0 | 0 | |
| Otsego County | 133 | 22,268 | 0 | 1 | |
| Ottawa County | 234 | 246,130 | 4 | 2 | |
| Presque Isle County | 52 | 9,127 | 0 | 2 | |
| Roscommon County | 233 | 56,079 | 3 | 11 | |
| Saginaw County | 61 | 169,637 | 0 | 1 | |
| Sanilac County | 73 | 25,200 | 13 | 3 | |
| Schoolcraft County | 69 | 9,335 | 1 | 0 | |
| Shiawassee County | 143 | 45,675 | 0 | 0 | |
| St. Clair County | 108 | 126,548 | 1 | 1 | |
| St. Joseph County | 137 | 50,565 | 2 | 1 | |
| Tuscola County | 102 | 28,070 | 2 | 1 | |
| Van Buren County | 196 | 57,796 | 1 | 2 | |
| Washtenaw County | 273 | 303,706 | 2 | 1 | |
| Wayne County | 63 | 1,797,027 | 0 | 2 | |
| Wexford County | 112 | 27,193 | 2 | 3 |
under 30% 30 to 59% 60% and over
About this data
Share with violations counts any violation in the past three years, including monitoring and reporting lapses. Counts cover active systems; systems serving more than one county are counted in each.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Michigan records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.