Michigan
Washtenaw County drinking water quality
273 active public water systems serve 303,706 people in Washtenaw County. 156 are compliant, 117 had at least one EPA violation in the past three years, 2 are designated serious violators, and 1 carries a health flag.
Needs attention
Community water systems
32 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Ann Arbor Ann Arbor |
123,851 | 1 | 1 | |
|
Ypsilanti Community Utility Authority Ypsilanti |
53,988 | 0 | 0 | |
|
Pittsfield Township Ann Arbor |
24,500 | 2 | 0 | |
|
Saline Saline |
9,158 | 1 | 0 | |
|
Scio Township Ann Arbor |
8,500 | 1 | 0 | |
|
Milan Milan |
7,363 | 0 | 0 | |
|
Superior Township Ypsilanti |
6,830 | 0 | 0 | |
|
Chelsea Chelsea |
5,474 | 0 | 0 | |
|
Dexter Dexter |
4,500 | 0 | 0 | |
|
Augusta Township Whittaker |
3,907 | 1 | 0 | |
|
Manchester Manchester |
2,150 | 0 | 0 | |
|
Northville Crossing |
1,890 | 3 | 0 | |
|
Northfield Estates |
1,620 | 0 | 0 | |
|
Loch Alpine Sanitary Authority Ann Arbor |
1,506 | 2 | 1 | |
|
Ann Arbor Township Ann Arbor |
1,338 | 0 | 0 | |
|
Thornton Farms |
1,188 | 0 | 0 | |
|
Chestnut Hills |
813 | 1 | 0 | |
|
Andelina Farms |
750 | 0 | 0 | |
|
Orchard Grove |
725 | 1 | 0 | |
|
River Ridge Saline |
720 | 0 | 0 | |
|
Barton Hills Ann Arbor |
450 | 2 | 0 | |
|
Saline Valley Farms |
375 | 1 | 1 | |
|
Westbrook Apartments Whitmore Lake |
330 | 4 | 1 | |
|
Harbor Cove Apartments Whitmore Lake |
288 | 0 | 0 | |
|
Austin Commons II |
280 | 1 | 0 | |
|
Sylvan Township Chelsea |
263 | 0 | 0 | |
|
Village at Eagle Gardens Whitmore Lake |
193 | 3 | 0 | |
|
Regency at Whitmore Lake |
190 | 6 | 3 | |
|
Copper Meadows |
128 | 2 | 0 | |
|
Sisters of Mary, Mother of Eucharist Ann Arbor |
100 | 0 | 0 | |
|
Pleasant Lake Park LLC |
60 | 3 | 0 | |
|
St. Louis Center Chelsea |
56 | 2 | 0 |
Non-community systems (241: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (292, 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.