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Wastewater treatment plants in Michigan

334 facilities · 1,148 MGD combined flow

Klarifi tracks 334 publicly owned wastewater treatment plants in Michigan with a combined average flow of 1,148 MGD, serving about 6,788,873 residents. 130 plants treat more than 1 MGD and 20 more than 10 MGD; 172 use lagoon systems and 97 have digesters or biogas infrastructure. The largest is GLWA Water Resource Recovery Facility in Detroit at 416.18 MGD. 26 NPDES permits expire this year and 44 next year.

Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account. Showing facilities 1–200 of 334 by average flow — browse the rest with the page links below.

334 plant locations in Michigan; dot size follows average flow. Boundaries: U.S. Census Bureau.

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.

All NPDES permits in Michigan →26 permits expiring in 2026 →44 permits expiring in 2027 →30 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Michigan

The 10 largest publicly owned wastewater treatment plants in Michigan by average flow, with NPDES permit, expiry and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
FacilityCityAvg flow (MGD)Design (MGD)NPDES permitExpiresViolations (3y)
GLWA Water Resource Recovery FacilityDetroit416.18—MI0022802Oct 202737
City Of Grand Rapids Wastewater Treatment PlantGrand Rapids42.18—MI0026069Oct 20299
City Of Saginaw Wastewater Treatment PlantSaginaw34.99—MI0025577Oct 202921
Southgate-Wyandotte Cso RtfWyandotte34.9—MI0036072Oct 20262
Wyandotte Wastewater PlantWyandotte33.91—MI0021156Oct 20215
Anthony Ragnone Wastewater Treatment PlantMontrose32.01—MI0022977Oct 20233
Kalamazoo Water Reclamation PlantKalamazoo27.05—MI0023299Oct 203037
Milk River Cso RtbGrosse Pointe Woods26.28—MI0025500Oct 202646
Ycua Regional Wastewater Treatment PlantYpsilanti23.69—MIL042676Dec 20305
City Of Wyoming Clean Water PlantGrandville16.16—MI0024392Oct 203074

Treatment technology for each plant is shown with a free Klarifi account. Create one →

The 50 largest plants in Michigan →EPA enforcement actions in Michigan →PFAS sources at Michigan plants →Michigan capital improvement plans →

Michigan plants by treatment technology

Lagoon systems (172)Activated sludge and clarifiers (117)Anaerobic digesters and biogas (97)Oxidation ditches (37)

All 334 plants in Michigan

FacilityCityFlow (MGD)
GLWA Water Resource Recovery FacilityDetroit416.18
City Of Grand Rapids Wastewater Treatment PlantGrand Rapids42.18
City Of Saginaw Wastewater Treatment PlantSaginaw34.99
Southgate-Wyandotte Cso RtfWyandotte34.9
Wyandotte Wastewater PlantWyandotte33.91
Anthony Ragnone Wastewater Treatment PlantMontrose32.01
Kalamazoo Water Reclamation PlantKalamazoo27.05
Milk River Cso RtbGrosse Pointe Woods26.28
Ycua Regional Wastewater Treatment PlantYpsilanti23.69
City Of Wyoming Clean Water PlantGrandville16.16
Warren Waste Water Treatment PlantWarren16.05
Dearborn CsoDearborn14.49
Ann Arbor WWTPAnn Arbor14.38
Clinton River WRRFPontiac14.29
Lansing WWTPLansing13.64
George W Kuhn Dr Dist Cso RtbMadison Heights11.52
Jackson WWTPJackson11.39
East Lansing Wastewater Treatment PlantEast Lansing11.19
Martin RtbSaint Clair Shores10.63
Monroe Metro Wastewater FacilityMonroe10.37
Holland WWTPHolland9.47
City Of Port Huron Wastewater Treatment PlantPort Huron7.93
Battle Creek WWTPBattle Creek7.58
Bay City Wastewater Treatment PlantBay City6.86
West Bay County Department Of Water/sewerBay City5.73
Mason WWTPMason5.69
Saginaw Twp WWTPSaginaw5.22
Grand Ledge WWTPGrand Ledge5.17
Niles WWTPNiles5.05
Delta Twp WWTPLansing4.67
Traverse City WWTPTraverse City4.58
North Kent Sa WWTPGrand Rapids3.74
Alpena WWTPAlpena3.71
City Of Mount Clemens Wastewater Treatment PlantMount Clemens3.7
Adrian WWTPAdrian3.59
Cbpu Waste Water Treatment PlantColdwater3.54
Owosso/mid Shiawassee Co WWTPOwosso3.53
Bedford Twp WWTPErie3.28
Grand Haven/spring Lake Wastewater Treatment PlantGrand Haven3.27
Iron Mountain-Kingsford WWTPKingsford3.12
Sault Ste. Marie Wastewater Treatment PlantSault Sainte Marie3.04
Baraga WwslBaraga2.91
Marquette WWTPMarquette2.86
Bangor WwslBangor2.62
Ithaca WwslIthaca2.58
Southern Clinton Co WWTPDe Witt2.5
Delhi Twp WWTPHolt2.47
Rose City WwslRose City2.4
Albion WWTPAlbion2.35
Zeeland WWTPZeeland2.29
Mt Pleasant WWTPMount Pleasant2.26
Commerce Twp WWTPWalled Lake2.25
Oakland Co Walled Lk Novi WWTPNovi2.21
Three Oaks WwslThree Oaks2.07
Marysville WWTPMarysville2.04
Portage Lake Authority WWTPHoughton2.04
Ludington WWTPLudington2.01
Cadillac WWTPCadillac1.99
Adams Twp/painesdale WwslPainesdale1.98
Perrinton WwslPerrinton1.92
Carson City WwslCarson City1.91
Ionia WWTPIonia1.9
Leoni Twp WWTPMichigan Center1.88
Powers WwslSpalding1.87
Sebewaing WwslSebewaing1.87
Genesee Co #7-Argentine WwslByron1.83
Bridgeport Twp WWTPBridgeport1.79
Ida-Raisinville Twps WwslIda1.75
Howard City WWTPHoward City1.74
Houghton Lake WWTPHoughton Lake1.71
Greenland Twp WwslMass City1.7
Centreville WwslCentreville1.69
Menominee WWTPMenominee1.66
St Clair County-Algonac WWTPAlgonac1.66
Grosse Ile Twp WWTPGrosse Ile1.64
Buena Vista Twp WWTPSaginaw1.63
Wixom WWTPWixom1.61
Capac WwslCapac1.61
Dowagiac WWTPDowagiac1.61
Port Hope WwslPort Hope1.61
Reading WwslReading1.61
St Charles WwslSaint Charles1.61
Wayne Co/inkster CsoInkster1.6
Olivet WwslOlivet1.59
Potterville WWTPPotterville1.58
Greenville WWTPGreenville1.57
Marshall WWTPMarshall1.53
Lenawee Cdc-Wamplers Lk WwslBrooklyn1.53
Birch Run WwslBirch Run1.53
Alma Wastewater Treatment PlantAlma1.52
Coleman WwslColeman1.51
Coopersville WWTPCoopersville1.5
Cheboygan WWTPCheboygan1.5
Kalamazoo Lake WWTPSaugatuck1.49
Ishpeming Area WWTPIshpeming1.48
Ovid WwslOvid1.47
Tittabawassee Twp WWTPFreeland1.45
Genoa-Oceola WWTPHowell1.4
Britton/ridgeway WwslBritton1.4
Sheridan WwslSheridan1.38
South Haven Area Water Sewer Authority WWTPSouth Haven1.37
Howell WWTPHowell1.36
Clarence Twp-Duck Lk WwslAlbion1.35
Saline WWTPSaline1.33
Adams Twp WwslAtlantic Mine1.26
Three Rivers WWTPThree Rivers1.26
Union Twp WWTPMt Pleasant1.25
Lowell WWTPLowell1.24
Manistique WWTPManistique1.24
Watersmeet Twp WwslWatersmeet1.23
Perry WwslPerry1.22
Lexington WwslLexington1.18
Lapeer WWTPLapeer1.17
Brighton WWTPBrighton1.16
Reese WwslReese1.16
Sturgis WWTPSturgis1.14
South Lyon WWTPSouth Lyon1.12
Petoskey WWTPPetoskey1.11
Marine City WWTPMarine City1.11
Maybee WwslMaybee1.1
Rudyard Twp WwslRudyard1.1
Decatur WwslDecatur1.07
Milan WWTPMilan1.06
Denton TownshipPrudenville1.05
Flushing WWTPFlushing1.05
New Baltimore WWTPNew Baltimore1.05
Frankenmuth WWTPFrankenmuth1.01
St Louis WWTPSt. Louis1.01
Galien WwslGalien1
Hopkins WwslHopkins1
Port Sanilac WwslPort Sanilac1
South Range WwslSouth Range1
Brevort Township WwslMoran1
St Clair WWTPSt Clair0.99
Sterling WwslSterling0.98
Dryden WWTPDryden0.98
Belding WWTPBelding0.98
Saranac WwslSaranac0.97
Bergland Twp WwslBergland0.97
Lenawee Cdc-Loch Erin WWTPOnsted0.96
Homer WwslHomer0.95
Merrill WwslMerrill0.92
Parma WwslParma0.91
Holly WWTPHolly0.91
Paw Paw Lake Area WWTPColoma0.91
Maple Rapids WwslMaple Rapids0.91
Superior Twp WwslBrimley0.91
Sagola Twp Channing WwslChanning0.9
North Branch Wwsl No 2North Branch0.89
North Branch WwslNorth Branch0.89
Mendon WwslMendon0.87
Casnovia WwslCasnovia0.87
Barryton WwslBarryton0.87
Peck WwslPeck0.87
Oakland Co-Acacia Park CsoBeverly Hills0.87
Kent City WWTPKent City0.86
Forestville WwslForestville0.85
Tawas Utility Authority WWTPEast Tawas0.85
Tekonsha WwslTekonsha0.85
Chelsea WWTPChelsea0.84
Charlotte WWTPCharlotte0.84
Lawrence WwslLawrence0.83
Rollin-Woodstock WWTPAddison0.82
Moore Twp/snover WwslSnover0.81
Paw Paw WWTPPaw Paw0.81
Gladwin WWTPGladwin0.8
Twining WwslTwining0.8
Wayne Co/dearborn Heights CsoDearborn Heights0.8
Webberville WwslWebberville0.8
Orleans Twp WwslOrleans0.8
Northfield Twp WWTPWhitmore Lake0.79
Carsonville WwslCarsonville0.78
Fairfield Twp Wwsl-JasperJasper0.78
Romeo WWTPRomeo0.77
Allegan WWTPAllegan0.77
Springport WwslSpringport0.76
Marcellus WwslMarcellus0.76
Rockland Twp WwslRockland0.75
Oakley WwslOakley0.75
New Lothrop WwslNew Lothrop0.73
Owendale WwslOwendale0.73
Camden WwslCamden0.71
St Ignace WWTPSaint Ignace0.71
Sandusky WWTPSandusky0.69
West Iron Co Sa WWTPCaspian0.69
Meyer Twp Sewer Dist WwslHermansville0.68
Emmett WwslEmmett0.68
Tecumseh WWTPTecumseh0.65
Ashley WwslAshley0.65
West Branch Area Wastewater Treatment FacilityWest Branch0.65
Lakeview WWTPLakeview0.64
Newberry WWTPNewberry0.64
Rogers City WWTPRogers City0.63
Custer WwslCuster0.63
Blissfield WWTPBlissfield0.62
Berlin Twp WWTPNewport0.62
Clayton WwslClayton0.62
Fairfield Twp-Weston Sec WwslWeston0.61
Harbor Beach WWTPHarbor Beach0.61
Baroda WwslBaroda0.6

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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 October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · Lift station · Inflow and infiltration · 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. “Wastewater treatment plants in Michigan.” Updated October 26, 2026. https://klarifi.io/facilities/michigan

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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