Michigan wastewater permits expiring in 2028
30 NPDES permits · 38 MGD combined average flow
30 publicly owned wastewater treatment plants in Michigan hold NPDES permits that expire during 2028, issued by Michigan Department of Environment, Great Lakes, and Energy. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Holland WWTP | Holland | 9.47 | MI0023108 | Oct 2028 | 0 |
| Saginaw Twp WWTP | Saginaw | 5.22 | MI0023973 | Oct 2028 | 10 |
| Adrian WWTP | Adrian | 3.59 | MI0022152 | Oct 2028 | 0 |
| Marysville WWTP | Marysville | 2.04 | MI0020656 | Oct 2028 | 1 |
| Leoni Twp WWTP | Michigan Center | 1.88 | MI0045942 | Oct 2028 | 1 |
| Alma Wastewater Treatment Plant | Alma | 1.52 | MI0020265 | Oct 2028 | 0 |
| Ishpeming Area WWTP | Ishpeming | 1.48 | MI0044423 | Oct 2028 | 64 |
| Tittabawassee Twp WWTP | Freeland | 1.45 | MI0027383 | Oct 2028 | 1 |
| South Haven Area Water Sewer Authority WWTP | South Haven | 1.37 | MI0020320 | Oct 2028 | 0 |
| South Lyon WWTP | South Lyon | 1.12 | MI0020273 | Oct 2028 | 11 |
| Marine City WWTP | Marine City | 1.11 | MI0020893 | Oct 2028 | 9 |
| Rollin-Woodstock WWTP | Addison | 0.82 | MI0027669 | Oct 2028 | 2 |
| Gladwin WWTP | Gladwin | 0.8 | MI0023001 | Oct 2028 | 5 |
| Sandusky WWTP | Sandusky | 0.69 | MI0020222 | Oct 2028 | 56 |
| West Iron Co Sa WWTP | Caspian | 0.69 | MI0043281 | Oct 2028 | 6 |
| Lakewood WW Auth WWTP | Lake Odessa | 0.58 | MI0042978 | Oct 2028 | 1 |
| Clare WWTP | Clare | 0.55 | MI0020176 | Oct 2028 | 8 |
| Milford WWTP | Milford | 0.54 | MI0023604 | Oct 2028 | 6 |
| Gladstone WWTP | Gladstone | 0.47 | MI0057676 | Oct 2028 | 9 |
| St Clair River Sa WWTP | East China | 0.45 | MI0022845 | Oct 2028 | 5 |
| Mackinac Island WWTP | Mackinac Island | 0.41 | MI0026751 | Oct 2028 | 131 |
| Imlay City WWTP | Imlay City | 0.34 | MI0023167 | Oct 2028 | 3 |
| Rockwood WWTP | Rockwood | 0.33 | MI0021181 | Oct 2028 | 26 |
| Bronson WWTP | Bronson | 0.24 | MI0020729 | Oct 2028 | 10 |
| Pinconning WWTP | Pinconning | 0.22 | MI0020711 | Oct 2028 | 0 |
| Handy Twp WWTP | Fowlerville | 0.1 | MI0056839 | Oct 2028 | 8 |
| Roscommon WWTP | Roscommon | 0.08 | MI0021482 | Oct 2028 | 0 |
| Billings Twp WWTP | Beaverton | 0.07 | MI0055719 | Oct 2028 | 2 |
| Onsted WWTP | Onsted | — | MI0028304 | Oct 2028 | 2 |
| Quincy WWTP | Quincy | — | MI0055751 | Oct 2028 | 4 |
Michigan permit renewals in 2028: 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: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Oxidation ditch · Anaerobic digester · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “NPDES permits expiring in 2028: Michigan wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/michigan/permits-expiring/2028Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.