Wastewater Treatment Plants in Michigan
305 facilities · 779 MGD combined flow
Klarifi tracks 305 publicly owned wastewater treatment plants in Michigan with a combined average flow of 779 MGD, serving about 6,762,480 residents. 70 plants treat more than 1 MGD and 14 more than 10 MGD; 182 use lagoon systems and 96 have digesters or biogas infrastructure. The largest is GLWA Water Resource Recovery Facility in Detroit at 349 MGD. 25 NPDES permits expire this year and 43 next year.
Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Showing facilities 1–200 of 305 by average flow — browse the rest with the page links below.
305 plant locations in Michigan; dot size follows average flow.
NPDES permits and renewals in Michigan
Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.
Largest wastewater treatment plants in Michigan
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|
| GLWA Water Resource Recovery Facility | Detroit | 349 | — | MIL022802 | Dec 2030 | Clarifiers | 38 |
| City Of Grand Rapids Wastewater Treatment Plant | Grand Rapids | 33.4 | — | MI0026069 | Oct 2029 | Clarifiers, Aerated lagoons, Biogas silos, Biogas balloons | 9 |
| Wyandotte Wastewater Plant | Wyandotte | 26.9 | — | MI0021156 | Oct 2021 | Clarifiers, Biogas silos, Biogas balloons | 5 |
| Kalamazoo Water Reclamation Plant | Kalamazoo | 24.94 | — | MI0023299 | Oct 2025 | Clarifiers, Biogas silos, Biogas balloons | 37 |
| Ycua Regional Wastewater Treatment Plant | Ypsilanti | 23.05 | — | MIL042676 | Dec 2030 | Clarifiers, Biogas silos | 5 |
| Anthony Ragnone Wastewater Treatment Plant | Montrose | 23.04 | — | MI0022977 | Oct 2023 | Clarifiers, Uncovered lagoons, Biogas silos | 3 |
| Southgate-Wyandotte Cso Rtf | Wyandotte | 16.88 | — | MI0036072 | Oct 2026 | Clarifiers, Biogas silos, Biogas balloons | 2 |
| City Of Wyoming Clean Water Plant | Grandville | 14.38 | — | MI0024392 | Oct 2030 | Clarifiers, Uncovered lagoons, Biogas silos | 74 |
| Ann Arbor WWTP | Ann Arbor | 13.6 | — | MI0022217 | Oct 2025 | Clarifiers, Biogas silos | 9 |
| City Of Saginaw Wastewater Treatment Plant | Saginaw | 13.41 | — | MI0025577 | Oct 2029 | Clarifiers, Uncovered lagoons | 21 |
| Warren Waste Water Treatment Plant | Warren | 12.1 | — | MI0024295 | Oct 2025 | Clarifiers | 8 |
| Clinton River WRRF | Pontiac | 10.99 | — | MI0023825 | Oct 2025 | Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons | 3 |
| Jackson WWTP | Jackson | 10.52 | — | MI0023256 | Oct 2027 | Clarifiers, Uncovered lagoons, Biogas silos | 41 |
| Lansing WWTP | Lansing | 10.06 | — | MI0023400 | Oct 2027 | Clarifiers | 5 |
| East Lansing Wastewater Treatment Plant | East Lansing | 9.13 | — | MI0022853 | Oct 2027 | Clarifiers, Aerated lagoons, Biogas silos, Biogas balloons | 1 |
| Holland WWTP | Holland | 8.7 | — | MI0023108 | Oct 2028 | Clarifiers, Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 0 |
| Monroe Metro Wastewater Facility | Monroe | 8.5 | — | MI0028401 | Oct 2024 | Clarifiers | 4 |
| Milk River Cso Rtb | Grosse Pointe Woods | 7.7 | — | MI0025500 | Oct 2026 | — | 46 |
| Battle Creek WWTP | Battle Creek | 7.55 | — | MI0022276 | Oct 2030 | Clarifiers, Biogas silos | 9 |
| Bay City Wastewater Treatment Plant | Bay City | 6.6 | — | MI0022284 | Oct 2015 | Clarifiers, Biogas balloons | 25 |
| City Of Port Huron Wastewater Treatment Plant | Port Huron | 6.03 | — | MI0023833 | Oct 2027 | Biogas balloons | 4 |
| Traverse City WWTP | Traverse City | 4.33 | — | MI0027481 | Oct 2029 | Biogas silos, Biogas balloons | 2 |
| West Bay County Department Of Water/sewer | Bay City | 4 | — | MI0042439 | Oct 2023 | Clarifiers, Biogas silos | 2 |
| Delta Twp WWTP | Lansing | 3.87 | — | MI0022799 | Oct 2027 | Clarifiers, Biogas silos, Biogas balloons | 4 |
| North Kent Sa WWTP | Grand Rapids | 3.48 | — | MI0057419 | Oct 2018 | — | 1 |
Michigan plants by treatment technology
All 305 plants in Michigan
Wastewater treatment 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.