Michigan drinking water quality
Michigan has 11,156 active public water systems serving 9.1 million people. 4,859 of them, 44%, had at least one EPA violation in the past three years, 680 have an unresolved violation today, and 131 are designated serious violators by the EPA.
Active systems
11,156
in 83 counties
People served
9.1M
1,391 community systems serve 7.5M
Violations, past 3 years
4,859
44% of active systems
Serious violators
131
114 systems carry a health flag
Largest counties
All 83 countiesLargest community water systems
All 11,156 systems| System | Serves | Status |
|---|---|---|
| Detroit City of Wayne County |
633,218 | |
| Grand Rapids Kent County |
306,901 | |
| Kalamazoo Kalamazoo County |
192,992 | |
| Lansing Board of Water & Light Ingham County |
166,000 | |
| Warren, City of Macomb County |
134,056 | |
| Sterling Heights, City of Macomb County |
127,000 | |
| Ann Arbor Washtenaw County |
123,851 | |
| Dearborn Wayne County |
109,976 | |
| Clinton Township Macomb County |
100,513 | |
| Canton Township Wayne County |
99,627 |
About the Michigan data
Retrieved from EPA ECHO on Oct 11, 2026. EPA records for Michigan systems do not include town names, so searches here match on ZIP code, street address, or county.