TTHM (Total Trihalomethanes) violations in Michigan
122 active public water systems in Michigan had a TTHM (Total Trihalomethanes) violation in the past three years, 11 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sunset Mobile Home Park Sanilac County |
263 | 2 | 0 | |
|
Hessel County |
240 | 4 | 0 | |
|
Midtown Flats, LLC Genesee County |
218 | 6 | 0 | |
|
Grant Township Copper Harbor Copper Harbor · Keweenaw County |
200 | 3 | 0 | |
|
Rose City, City of Rose City · Ogemaw County |
180 | 3 | 0 | |
|
Gogebic Range Water Auth Gogebic County |
177 | 2 | 0 | |
|
Caledonia Estates Kent County |
160 | 3 | 0 | |
|
Bedford Meadows Monroe · Monroe County |
156 | 1 | 0 | |
|
Manistique County |
147 | 4 | 0 | |
|
Evergreen Estates Tuscola County |
145 | 2 | 0 | |
|
Huron Bay Resort Sanilac County |
140 | 1 | 0 | |
|
Kent Ridge Apartments Kent County |
120 | 6 | 0 | |
|
Maple Grove Estates Allegan County |
115 | 1 | 0 | |
|
Flint Elks #222 Country Club Genesee County |
100 | 5 | 1 | |
|
MY Place at Twin Valley Calhoun County |
88 | 8 | 1 | |
|
Leelanau CO Law Enforcement Center Leelanau County |
75 | 1 | 0 | |
|
Wetmore County |
52 | 4 | 0 | |
|
J Rettenmaier USA Plant Kalamazoo County |
50 | 1 | 0 | |
|
Hillside Acres Hillsdale County |
48 | 4 | 0 | |
|
Byram Ridge Linden · Genesee County |
40 | 6 | 1 | |
|
Vicinia Gardens Genesee County |
40 | 2 | 0 | |
|
North Branch Assisted Living Lapeer County |
35 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
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.