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Wastewater treatment plants in Missouri

593 facilities · 488 MGD combined flow

Klarifi tracks 593 publicly owned wastewater treatment plants in Missouri with a combined average flow of 488 MGD, serving about 4,108,253 residents. 61 plants treat more than 1 MGD and 8 more than 10 MGD; 140 use lagoon systems and 21 have digesters or biogas infrastructure. The largest is Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis at 90.1 MGD. 46 NPDES permits expire this year and 65 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 593 by average flow — browse the rest with the page links below.

593 plant locations in Missouri; dot size follows average flow.

NPDES permits and renewals in Missouri

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 Missouri →46 permits expiring in 2026 →65 permits expiring in 2027 →69 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Missouri

The 10 largest publicly owned wastewater treatment plants in Missouri 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)
Metropolitan St. Louis Sewer District Bissell Point WWTPSt. Louis90.1—MO0025178Aug 203114
Metropolitan St. Louis Sewer District Lemay WWTPSt. Louis79.3—MO0025151Aug 20310
Little Blue Valley Sewer DistrictIndependence29.2—MOL101087Dec 203014
Southwest WWTPSpringfield25.32—MO0049522Jul 20250
St. Joseph Water Protection FacilitySaint Joseph18.27—MO0023043Nov 20254
MSD Coldwater WWTPFlorissant14.3—MO0025160Aug 20311
Kc, Westside WWTPKansas City12.54—MO0024929Jun 20262
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment PlantValley Park10.4—MO0101362Aug 20310
MSD Lower Meramec WWTPSt. Louis7.6—MO0127949Aug 20310
O' Fallon Wastewater Treatment PlantO'Fallon6.7—MO0028720Mar 20250

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

The 50 largest plants in Missouri →EPA enforcement actions in Missouri →Missouri capital improvement plans →

Missouri plants by treatment technology

UV disinfection (297)Lagoon systems (289)Activated sludge and clarifiers (97)Chlorine disinfection (96)Oxidation ditches (57)Anaerobic digesters and biogas (26)Nutrient removal (23)

All 593 plants in Missouri

FacilityCityFlow (MGD)
Metropolitan St. Louis Sewer District Bissell Point WWTPSt. Louis90.1
Metropolitan St. Louis Sewer District Lemay WWTPSt. Louis79.3
Little Blue Valley Sewer DistrictIndependence29.2
Southwest WWTPSpringfield25.32
St. Joseph Water Protection FacilitySaint Joseph18.27
MSD Coldwater WWTPFlorissant14.3
Kc, Westside WWTPKansas City12.54
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment PlantValley Park10.4
MSD Lower Meramec WWTPSt. Louis7.6
O' Fallon Wastewater Treatment PlantO'Fallon6.7
Joplin Turkey Creek WWTPJoplin5.7
Shoal Creek Wastewater Treatment FacilityJoplin5.6
Jefferson City RwrfJefferson City5.36
Rock Creek Waste TreatmentIndependence5.07
St Peters PwsSaint Peters4.83
Cape Girardeau WWTPCape Girardeau4.36
Wentzville PwsWentzville4.34
Dcsd Wastewater Treatment Plant 2Weldon Spring4.28
Springfield NW WWTPSpringfield4.06
Duckett Creek Sanitation District Treatment Plant #1Saint Charles4.04
St Charles Missouri River WWTPSt. Charles3.73
MSD Fenton Waste Water Treatment PlantFenton3.6
Blue Springs, Sni A Bar WWTFGrain Valley3.5
Poplar Bluff Municipal WWTPPoplar Bluff3.18
Carthage WWTPCarthage2.92
Hannibal PwsHannibal2.69
Monett Wastewater Treatment PlantMonett2.5
Branson Compton Drive WWTPBranson2.26
Sikeston WWTPSikeston2.23
Lebanon WWTPLebanon2.22
Marshall SE WWTPMarshall2.22
Rolla Pws-Well 4 - E 10th StRolla2.17
Kirksville WWTPKirksville2.02
Hollister WWTFHollister2
Neosho WWTPNeosho2
Festus-Crystal City WWTPCrystal City1.81
Branson Cooper Creek WWTPBranson1.73
Npsd Interim Saline Creek Regional WWTPFenton1.71
Washington WWTPWashington1.65
Center Creek WWTPWebb City1.57
Camelot Estates WWTPCamdenton1.55
Pleasant Hill PwsPleasant Hill1.53
Nixa WWTFNixa1.52
West Plains Pws-West Plains Treatment PltWest Plains1.46
Kimmswick WWTPImperial1.42
Republic WWTPRepublic1.38
Fulton WWTPFulton1.37
Lake Of The Ozarks Regional WWTP 1Lake Ozark1.36
Sunny Slope Country Club Drive WWTPCamdenton1.35
Sedalia Central WWTPSedalia1.28
Moberly WWTPMoberly1.25
Waynesville PwsWaynesville1.18
Troy Southeast WWTPTroy1.16
Warrenton PwsWarrenton1.16
Park Hills Mineral Belt WWTPBonne Terre1.14
Mawc, Eureka WWTFEureka1.13
Clinton WWTPClinton1.09
Farmington East WWTPFarmington1.04
Kearney WWTPKearney1.03
Ozark WWTFOzark1.03
Excelsior Springs Waste Water Treatment FacilityExcelsior Springs1
Macon WWTPMacon0.98
Farmington PwsFarmington0.98
Chillicothe WWTPChillicothe0.96
Nevada WWTFNevada0.94
Maryville WWTPMaryville0.92
California South WWTFCalifornia0.92
Perryville SE WWTPPerryville0.9
Jackson WWTPJackson0.9
Richmond South WWTPRichmond0.87
El Dorado SpringsEl Dorado Springs0.87
Pacific WWTPPacific0.85
Harrisonville PwsHarrisonville0.84
Kc Rocky Branch WWTPKansas City0.81
Sullivan WWTPSullivan0.81
Aurora City Of Street DeptAurora0.79
Pcrsd Brush Creek WWTPParkville0.77
Sedalia Southeast WWTPSedalia0.77
Cuba Pws-Well #5 American Way Dr TreatmentCuba0.73
Salem Municipal WWTFSalem0.73
Warrensburg West WWTPWarrensburg0.73
Cameron WWTPCameron0.72
Warrensburg East WWTPWarrensburg0.71
Pevely WWTPPevely0.7
Caruthersville WWTFCaruthersville0.66
Union PwsUnion0.65
Windsor Southwest WWTFWindsor0.65
St. James WWTPSt. James0.65
Carl Junction PwsCarl Junction0.64
St Robert PwsSt Robert0.64
Boonville WWTPBoonville0.63
Pike Creek Sewer District WWTFPoplar Bluff0.61
Shawnee BendSunrise Beach0.6
Oak Grove WWTFOak Grove0.6
Mount Vernon PwsMount Vernon0.59
Sedalia North WWTPSedalia0.58
Winfield WWTFWinfield0.58
Lake Hannibal Estate WWTFHannibal0.56
Kennett WWTFKennett0.56
Charleston WWTFCharleston0.54
Dexter East WWTFDexter0.54
Bakersfield WWTPBakersfield0.51
MarshfieldMarshfield0.51
Dcsd, Treatment Plant 4Wentzville0.51
Hayti PwsHayti0.5
Platte City Sanitary Sewer InterceptorPlatte City0.5
ClevelandCleveland0.49
Elk Valley WWTFOzark0.49
Glaize Creek Sewer District WWTPBarnhart0.48
Carrollton WWTPCarrollton0.48
Brookfield WWTPBrookfield0.48
Fredericktown Pws-Fredericktown - Treatment PlantFredericktown0.48
Potosi PwsPotosi0.48
Milan WWTPMilan0.47
Camdenton PwsCamdenton0.46
Newburg WWTPNewburg0.45
Lamar WWTFLamar0.45
St Clair PwsSt. Clair0.44
Rolla Vichy Road WWTPRolla0.44
Northeast Correctional Center WWTFBowling Green0.44
Ava WWTPAva0.44
De Soto WWTPDe Soto0.44
Canton WWTPCanton0.43
Forsyth Pws-Well # 5 - Old ForsythForsyth0.43
Algoa Correctional CenterJefferson City0.42
Cassville WWTPCassville0.41
Clark Pws-Chlorine Booster StationClark0.4
Dexter West WWTPDexter0.39
Campbell WWTFCampbell0.38
Eldon WWTPEldon0.38
Piedmont ProcessingPiedmont0.38
Portageville WWTPPortageville0.37
Theodosia WWTPTheodosia0.37
Mountain Grove East WWTPMountain Grove0.36
Lcpwsd No.1 To Bobs Creek WWTFWinfield0.36
Ashland WWTFAshland0.36
Peculiar WWTPPeculiar0.36
Warsaw PwsWarsaw0.35
Hermann Industrial Tract LagoonHermann0.34
Buffalo Head StartBuffalo0.34
Willow Springs WWTPWillow Springs0.33
Licking PwsLicking0.33
Anderson WWTFAnderson0.33
Steelville PwsSteelville0.33
Fayette WWTFFayette0.32
Tipton WWTPTipton0.32
Lexington WWTFLexington0.32
Plattsburg Pws-Plattsburg - Treatment PlantPlattsburg0.32
Marionville Water Supply C/o City HallMarionville0.31
Scott City PwsScott City0.31
Mountain View WWTPMountain View0.3
Senath Pws-Well #3 Witch Hat Well Treatment (1996)Senath0.3
Savannah WWTFSavannah0.3
Rogersville WWTPRogersville0.29
Higginsville South WWTFHigginsville0.29
Cainsville PwsCainsville0.29
Hillsboro North WWTFHillsboro0.28
Pulaski Co. Sd # 1, Weeks Hollow WWTFWaynesville0.27
Doniphan Municipal WWTFDoniphan0.27
Fair Grove WWTPFair Grove0.26
Shelbina WWTPShelbina0.25
Rockaway BeachRockaway Beach0.25
Thayer WWTPThayer0.25
Richland PwsRichland0.25
Cairo WWTFCairo0.25
Houston Pws-Well # 2 Agusta St TreatmentHouston0.25
Pierce City WWTFPierce City0.25
Moscow Mills WWTFMoscow Mills0.25
Bonne Terre Northeast WWTPBonne Terre0.24
Union East STPUnion0.23
Benton WWTPBenton0.23
Bonne Terre PwsBonne Terre0.23
Mansfield Pws-Treatment PlantMansfield0.23
St. Jude Industrial Park DwtpNew Madrid0.22
Odessa SE WWTPOdessa0.22
Stockton PwsStockton0.22
Raintree PlantationHillsboro0.22
Palmyra WWTPPalmyra0.22
Miner WWTFMiner0.21
Linn Wastewater Treatment FacilityLinn0.21
Bcrsd Rocky Fork WWTPColumbia0.21
Marble Hill WWTFMarble Hill0.2
Monroe City WWTPMonroe City0.2
Albany PwsAlbany0.2
Lake Lotawana WWTP #1Lake Lotawana0.19
Slater PwsSlater0.19
Hillsboro WWTPHillsboro0.18
Buckner WWTPBuckner0.18
Montgomery City PwsMontgomery City0.18
Higginsville North WWTFHigginsville0.18
East Prairie WWTFEast Prairie0.17
Miller WWTFMiller0.17
New Haven PwsNew Haven0.17
Jcpsd Lower Big River WWTPHouse Springs0.17
Mokane WWTFMokane0.17
Owensville WWTFOwensville0.16
Kimberling City WWTPKimberling City0.16
Normac Sewer District WWTPCamdenton0.16
Jasper WWTFJasper0.16
Seymour PwsSeymour0.16

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Wastewater treatment in Missouri: 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 14, 2026.

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