Oxidation ditches: wastewater treatment plants in Michigan
35 plants · 11% of the state · 35 MGD combined
Klarifi identifies 35 publicly owned wastewater treatment plants with oxidation ditches in Michigan, 11% of the 305 plants in the state (35 MGD combined). The largest is Holland WWTP in Holland at 8.7 MGD.
Oxidation ditches are ring-shaped activated sludge reactors with long retention times, common at plants between 0.5 and 10 MGD. They are recognisable from the air by their looped channels and rely on surface aerators or brush rotors, which are frequent replacement and energy-efficiency projects.
The largest oxidation ditch plants in Michigan
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Holland WWTP | Holland | 8.7 | MI0023108 | Oct 2028 | 0 |
| 2 | Saginaw Twp WWTP | Saginaw | 3.24 | MI0023973 | Oct 2028 | 10 |
| 3 | City Of Mount Clemens Wastewater Treatment Plant | Mount Clemens | 3.06 | MI0023647 | Oct 2025 | 6 |
| 4 | Commerce Twp WWTP | Walled Lake | 2.13 | MI0025071 | Oct 2026 | 0 |
| 5 | Wixom WWTP | Wixom | 1.39 | MI0024384 | Oct 2027 | 14 |
| 6 | Genoa-Oceola WWTP | Howell | 1.36 | MI0055654 | Oct 2026 | 1 |
| 7 | Union Twp WWTP | Mt Pleasant | 1.33 | MI0055808 | May 2027 | 0 |
| 8 | Bridgeport Twp WWTP | Bridgeport | 0.97 | MI0022446 | Oct 2027 | 0 |
| 9 | Brighton WWTP | Brighton | 0.94 | MI0020877 | Oct 2025 | 8 |
| 10 | Chelsea WWTP | Chelsea | 0.85 | MI0020737 | Oct 2026 | 0 |
| 11 | Lowell WWTP | Lowell | 0.85 | MI0020311 | Oct 2029 | 0 |
| 12 | Cheboygan WWTP | Cheboygan | 0.84 | MI0020303 | Oct 2026 | 16 |
| 13 | Milan WWTP | Milan | 0.83 | MI0021571 | Oct 2029 | 47 |
| 14 | New Baltimore WWTP | New Baltimore | 0.83 | MI0023680 | Oct 2029 | 0 |
| 15 | Lapeer WWTP | Lapeer | 0.78 | MI0020460 | Oct 2029 | 58 |
| 16 | Marine City WWTP | Marine City | 0.74 | MI0020893 | Oct 2028 | 9 |
| 17 | St Louis WWTP | St. Louis | 0.59 | MI0021555 | Oct 2027 | 9 |
| 18 | Milford WWTP | Milford | 0.49 | MI0023604 | Oct 2028 | 6 |
| 19 | Fowlerville WWTP | Fowlerville | 0.47 | MI0020664 | Oct 2027 | 3 |
| 20 | Sparta WWTP | Sparta | 0.47 | MI0020478 | Sep 2029 | 7 |
| 21 | Lakewood WW Auth WWTP | Lake Odessa | 0.46 | MI0042978 | Oct 2028 | 1 |
| 22 | Harbor Beach WWTP | Harbor Beach | 0.45 | MI0020672 | Oct 2029 | 0 |
| 23 | Munising WWTP | Munising | 0.45 | MI0020044 | Sep 2029 | 25 |
| 24 | Blissfield WWTP | Blissfield | 0.37 | MI0021695 | Oct 2029 | 7 |
| 25 | Brighton Twp WWTP | Brighton | 0.34 | MI0054968 | Oct 2025 | 9 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Michigan
Oxidation ditches in other states
Oxidation ditches in Michigan: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.