Michigan
St. Clair County drinking water quality
108 active public water systems serve 126,548 people in St. Clair County. 78 are compliant, 30 had at least one EPA violation in the past three years, 1 is a designated serious violator, and 1 carries a health flag.
Needs attention
Community water systems
21 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Port Huron, City of Port Huron |
28,983 | 0 | 0 | |
|
Port Huron Township |
10,654 | 3 | 1 | |
|
Fort Gratiot Township |
10,640 | 1 | 0 | |
|
Marysville, City of Marysville |
9,959 | 0 | 0 | |
|
Clay Township |
9,866 | 0 | 0 | |
|
Ira Township |
6,510 | 0 | 0 | |
|
St. Clair Water and Sewer Authority |
5,847 | 0 | 0 | |
|
St. Clair, City of |
5,464 | 2 | 0 | |
|
Kimball Township |
5,170 | 5 | 1 | |
|
Marine City Marine City |
4,652 | 2 | 1 | |
|
Algonac, City of Algonac |
4,110 | 0 | 0 | |
|
St. Clair Township |
3,270 | 0 | 0 | |
|
Cottrellville Township |
3,200 | 0 | 0 | |
|
Burtchville Township |
2,900 | 1 | 0 | |
|
Clyde Township |
2,400 | 0 | 0 | |
|
Yale, City of Yale |
1,900 | 3 | 1 | |
|
Capac, Village of Capac |
1,775 | 3 | 0 | |
|
Memphis, City of Memphis |
1,084 | 0 | 0 | |
|
Pinewood on the Lake MHP |
950 | 0 | 0 | |
|
Sunrise MHP |
120 | 0 | 0 | |
|
Dunrentin Heights Subdivision |
81 | 1 | 0 |
Non-community systems (87: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (167, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.