Who issues NPDES permits in Michigan?

Michigan Department of Environment, Great Lakes, and Energy issues and enforces NPDES permits for wastewater discharges in Michigan. Klarifi tracks 305 permits held by publicly owned treatment plants in the state.

How many NPDES permits in Michigan are expired or administratively continued?

136 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 1 are recorded as expired, out of 305 permits tracked. 168 are effective.

How many Michigan wastewater permits come up for renewal soon?

25 in 2026, 43 in 2027 and 29 in 2028. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in Michigan

Name: NPDES permits held by wastewater treatment plants in Michigan
Creator: Klarifi
License: https://klarifi.io/terms-of-service

305 permits held by publicly owned wastewater treatment plants · issued by EGLE

Effective

168

Administratively continued

136

Expired

Total tracked

305

Michigan Department of Environment, Great Lakes, and Energy (EGLE) runs the NPDES program in Michigan under delegation from EPA Region 5, issuing and enforcing the discharge permits listed here. Klarifi tracks 305 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

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.

Permit renewals by year

2026: 25 permits →2027: 43 permits →2028: 29 permits →

2029: 62 permits

2030: 9 permits

Largest permit holders in Michigan

The 25 largest publicly owned wastewater treatment plants in Michigan by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
GLWA Water Resource Recovery Facility	Detroit	349	—	MIL022802	Effective	Dec 2030	38
City Of Grand Rapids Wastewater Treatment Plant	Grand Rapids	33.4	—	MI0026069	Effective	Oct 2029	9
Wyandotte Wastewater Plant	Wyandotte	26.9	—	MI0021156	Administratively continued	Oct 2021	5
Kalamazoo Water Reclamation Plant	Kalamazoo	24.94	—	MI0023299	Administratively continued	Oct 2025	37
Ycua Regional Wastewater Treatment Plant	Ypsilanti	23.05	—	MIL042676	Effective	Dec 2030	5
Anthony Ragnone Wastewater Treatment Plant	Montrose	23.04	—	MI0022977	Administratively continued	Oct 2023	3
Southgate-Wyandotte Cso Rtf	Wyandotte	16.88	—	MI0036072	Effective	Oct 2026	2
City Of Wyoming Clean Water Plant	Grandville	14.38	—	MI0024392	Effective	Oct 2030	74
Ann Arbor WWTP	Ann Arbor	13.6	—	MI0022217	Administratively continued	Oct 2025	9
City Of Saginaw Wastewater Treatment Plant	Saginaw	13.41	—	MI0025577	Effective	Oct 2029	21
Warren Waste Water Treatment Plant	Warren	12.1	—	MI0024295	Administratively continued	Oct 2025	8
Clinton River WRRF	Pontiac	10.99	—	MI0023825	Administratively continued	Oct 2025	3
Jackson WWTP	Jackson	10.52	—	MI0023256	Effective	Oct 2027	41
Lansing WWTP	Lansing	10.06	—	MI0023400	Effective	Oct 2027	5
East Lansing Wastewater Treatment Plant	East Lansing	9.13	—	MI0022853	Effective	Oct 2027	1
Holland WWTP	Holland	8.7	—	MI0023108	Effective	Oct 2028	0
Monroe Metro Wastewater Facility	Monroe	8.5	—	MI0028401	Administratively continued	Oct 2024	4
Milk River Cso Rtb	Grosse Pointe Woods	7.7	—	MI0025500	Effective	Oct 2026	46
Battle Creek WWTP	Battle Creek	7.55	—	MI0022276	Effective	Oct 2030	9
Bay City Wastewater Treatment Plant	Bay City	6.6	—	MI0022284	Administratively continued	Oct 2015	25
City Of Port Huron Wastewater Treatment Plant	Port Huron	6.03	—	MI0023833	Effective	Oct 2027	4
Niles WWTP	Niles	3.2	5.8	MI0023701	Administratively continued	Oct 2017	0
Traverse City WWTP	Traverse City	4.33	—	MI0027481	Effective	Oct 2029	2
Mt Pleasant WWTP	Mount Pleasant	1.88	4.14	MI0023655	Expired	Mar 2025	18
West Bay County Department Of Water/sewer	Bay City	4	—	MI0042439	Administratively continued	Oct 2023	2

All 305 plants in Michigan →

NPDES permits 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.

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