Oxidation ditches: wastewater treatment plants in Michigan
37 plants · 11% of the state · 45 MGD combined
Klarifi identifies 37 publicly owned wastewater treatment plants with oxidation ditches in Michigan, 11% of the 334 plants in the state (45 MGD combined). The largest is Holland WWTP in Holland at 9.47 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 | 9.47 | MI0023108 | Oct 2028 | 0 |
| 2 | Saginaw Twp WWTP | Saginaw | 5.22 | MI0023973 | Oct 2028 | 10 |
| 3 | City Of Mount Clemens Wastewater Treatment Plant | Mount Clemens | 3.7 | MI0023647 | Oct 2025 | 6 |
| 4 | Commerce Twp WWTP | Walled Lake | 2.25 | MI0025071 | Oct 2026 | 0 |
| 5 | Bridgeport Twp WWTP | Bridgeport | 1.79 | MI0022446 | Oct 2027 | 0 |
| 6 | Wixom WWTP | Wixom | 1.61 | MI0024384 | Oct 2027 | 14 |
| 7 | Cheboygan WWTP | Cheboygan | 1.5 | MI0020303 | Oct 2026 | 16 |
| 8 | Genoa-Oceola WWTP | Howell | 1.4 | MI0055654 | Oct 2026 | 1 |
| 9 | Union Twp WWTP | Mt Pleasant | 1.25 | MI0055808 | May 2027 | 0 |
| 10 | Lowell WWTP | Lowell | 1.24 | MI0020311 | Oct 2029 | 0 |
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 October 26, 2026.
Wastewater terms: Oxidation ditch · Activated sludge · Biological nutrient removal · MGD · Lift station · all terms