How many wastewater treatment plants are there in Missouri?

Klarifi tracks 671 publicly owned wastewater treatment plants in Missouri with a combined average flow of 646 million gallons per day, serving about 4,169,880 residents. 80 of them treat more than 1 MGD and 8 more than 10 MGD.

What is the largest wastewater treatment plant in Missouri?

Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis is the largest plant in Missouri by average flow, treating about 123.06 MGD.

What treatment technologies are common in Missouri?

148 of Missouri's plants use lagoon systems and 22 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Missouri are up for renewal?

54 permits held by Missouri plants expire in 2026 and 79 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater treatment plants in Missouri

Name: Wastewater treatment plants in Missouri
Creator: Klarifi
License: https://klarifi.io/terms-of-service

671 facilities · 646 MGD combined flow

Klarifi tracks 671 publicly owned wastewater treatment plants in Missouri with a combined average flow of 646 MGD, serving about 4,169,880 residents. 80 plants treat more than 1 MGD and 8 more than 10 MGD; 148 use lagoon systems and 22 have digesters or biogas infrastructure. The largest is Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis at 123.06 MGD. 54 NPDES permits expire this year and 79 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 671 by average flow — browse the rest with the page links below.

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

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 →54 permits expiring in 2026 →79 permits expiring in 2027 →79 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.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Violations (3y)
Metropolitan St. Louis Sewer District Bissell Point WWTP	St. Louis	123.06	—	MO0025178	Aug 2031	14
Metropolitan St. Louis Sewer District Lemay WWTP	St. Louis	105.45	—	MO0025151	Aug 2031	6
Little Blue Valley Sewer District	Independence	39.13	—	MOL101087	Dec 2030	14
Southwest WWTP	Springfield	30.9	—	MO0049522	Jul 2025	0
MSD Coldwater WWTP	Florissant	22.75	—	MO0025160	Aug 2031	1
St. Joseph Water Protection Facility	Saint Joseph	20.69	—	MO0023043	Nov 2025	4
Kc, Westside WWTP	Kansas City	14.89	—	MO0024929	Jun 2026	2
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant	Valley Park	12.6	—	MO0101362	Aug 2031	0
MSD Lower Meramec WWTP	St. Louis	9.68	—	MO0127949	Aug 2031	0
Joplin Turkey Creek WWTP	Joplin	9.49	—	MO0103349	Sep 2022	65

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

Lagoon systems (350)UV disinfection (311)Activated sludge and clarifiers (103)Chlorine disinfection (98)Oxidation ditches (64)Anaerobic digesters and biogas (28)Nutrient removal (24)

All 671 plants in Missouri

Facility	City	Flow (MGD)
Metropolitan St. Louis Sewer District Bissell Point WWTP	St. Louis	123.06
Metropolitan St. Louis Sewer District Lemay WWTP	St. Louis	105.45
Little Blue Valley Sewer District	Independence	39.13
Southwest WWTP	Springfield	30.9
MSD Coldwater WWTP	Florissant	22.75
St. Joseph Water Protection Facility	Saint Joseph	20.69
Kc, Westside WWTP	Kansas City	14.89
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant	Valley Park	12.6
MSD Lower Meramec WWTP	St. Louis	9.68
Joplin Turkey Creek WWTP	Joplin	9.49
O' Fallon Wastewater Treatment Plant	O'Fallon	7.55
Jefferson City Rwrf	Jefferson City	7.03
Rock Creek Waste Treatment	Independence	6.35
Shoal Creek Wastewater Treatment Facility	Joplin	5.66
St Peters Pws	Saint Peters	5.65
Cape Girardeau WWTP	Cape Girardeau	5.39
Springfield NW WWTP	Springfield	5
Dcsd Wastewater Treatment Plant 2	Weldon Spring	4.93
Blue Springs, Sni A Bar WWTF	Grain Valley	4.89
Poplar Bluff Municipal WWTP	Poplar Bluff	4.75
Wentzville Pws	Wentzville	4.64
Duckett Creek Sanitation District Treatment Plant #1	Saint Charles	4.45
Carthage WWTP	Carthage	4.22
St Charles Missouri River WWTP	St. Charles	4.2
MSD Fenton Waste Water Treatment Plant	Fenton	4.04
Hannibal Pws	Hannibal	3.71
Rolla Pws-Well 4 - E 10th St	Rolla	3.4
Center Creek WWTP	Webb City	2.78
Monett Wastewater Treatment Plant	Monett	2.77
Lebanon WWTP	Lebanon	2.75
Marshall SE WWTP	Marshall	2.73
Kirksville WWTP	Kirksville	2.71
Washington WWTP	Washington	2.48
Sedalia Southeast WWTP	Sedalia	2.48
Bismarck Pws	Bismarck	2.33
Branson Compton Drive WWTP	Branson	2.33
Waynesville Pws	Waynesville	2.26
Sikeston WWTP	Sikeston	2.25
Pleasant Hill Pws	Pleasant Hill	2.13
Moberly WWTP	Moberly	2.08
Festus-Crystal City WWTP	Crystal City	2
Neosho WWTP	Neosho	1.89
Sedalia Central WWTP	Sedalia	1.88
Hollister WWTF	Hollister	1.85
Vandalia WWTF	Vandalia	1.84
Fulton WWTP	Fulton	1.8
Kimmswick WWTP	Imperial	1.79
Perryville SE WWTP	Perryville	1.77
Farmington East WWTP	Farmington	1.71
Park Hills Mineral Belt WWTP	Bonne Terre	1.71
Branson Cooper Creek WWTP	Branson	1.69
Nixa WWTF	Nixa	1.66
Republic WWTP	Republic	1.65
California South WWTF	California	1.64
Mawc, Eureka WWTF	Eureka	1.54
West Plains Pws-West Plains Treatment Plt	West Plains	1.48
Nevada WWTF	Nevada	1.46
Troy Southeast WWTP	Troy	1.44
Lake Of The Ozarks Regional WWTP 1	Lake Ozark	1.43
Carl Junction Pws	Carl Junction	1.41
Warrenton Pws	Warrenton	1.36
Macon WWTP	Macon	1.33
Clinton WWTP	Clinton	1.32
Pacific WWTP	Pacific	1.3
Sunny Slope Country Club Drive WWTP	Camdenton	1.28
Farmington Pws	Farmington	1.25
Aurora City Of Street Dept	Aurora	1.25
Camelot Estates WWTP	Camdenton	1.22
Harrisonville Pws	Harrisonville	1.2
Cuba Pws-Well #5 American Way Dr Treatment	Cuba	1.15
Chillicothe WWTP	Chillicothe	1.12
El Dorado Springs	El Dorado Springs	1.12
Parma Pws-Parma - Treatment Plant	Parma	1.1
Maryville WWTP	Maryville	1.09
Dexter West WWTP	Dexter	1.08
Jackson WWTP	Jackson	1.06
Union Pws	Union	1.05
Kc Rocky Branch WWTP	Kansas City	1.05
Sedalia North WWTP	Sedalia	1.04
Sullivan WWTP	Sullivan	1.04
Ozark WWTF	Ozark	0.99
Kearney WWTP	Kearney	0.97
Marshfield	Marshfield	0.95
Warrensburg East WWTP	Warrensburg	0.95
Smithville WTP	Smithville	0.94
Boonville WWTP	Boonville	0.92
Freeburg WWTF	Freeburg	0.92
Cameron WWTP	Cameron	0.91
Warrensburg West WWTP	Warrensburg	0.91
Pike Creek Sewer District WWTF	Poplar Bluff	0.91
Pevely WWTP	Pevely	0.87
Pcrsd Brush Creek WWTP	Parkville	0.87
St. James WWTP	St. James	0.86
Deepwater WWTP	Deepwater	0.86
Eldon WWTP	Eldon	0.85
Salem Municipal WWTF	Salem	0.85
Cabool WWTF	Cabool	0.83
Mount Vernon Pws	Mount Vernon	0.79
Buffalo Head Start	Buffalo	0.77
Canton WWTP	Canton	0.77
St Robert Pws	St Robert	0.75
St Clair Pws	St. Clair	0.75
De Soto WWTP	De Soto	0.74
Dcsd, Treatment Plant 4	Wentzville	0.74
Glaize Creek Sewer District WWTP	Barnhart	0.73
Carrollton WWTP	Carrollton	0.73
Oak Grove WWTF	Oak Grove	0.71
Granby Pws	Granby	0.67
Elk Valley WWTF	Ozark	0.64
Butler WW Treatment Plant	Butler	0.64
Clark Pws-Chlorine Booster Station	Clark	0.63
Fredericktown Pws-Fredericktown - Treatment Plant	Fredericktown	0.6
Holcomb WWTF	Holcomb	0.59
Potosi Pws	Potosi	0.58
Charleston WWTF	Charleston	0.58
Pevely, Hunters Glen Subdivision	Barnhart	0.58
Lamar WWTF	Lamar	0.58
Northeast Correctional Center WWTF	Bowling Green	0.57
Kennett WWTF	Kennett	0.57
Dexter East WWTF	Dexter	0.54
Forsyth Pws-Well # 5 - Old Forsyth	Forsyth	0.54
Scott City Pws	Scott City	0.54
Caruthersville WWTF	Caruthersville	0.54
Downing Pws	Downing	0.53
Fayette WWTF	Fayette	0.5
Theodosia WWTP	Theodosia	0.5
Owensville WWTF	Owensville	0.49
Blackwater	Blackwater	0.49
Bunceton Pws	Bunceton	0.48
Ashland WWTF	Ashland	0.48
Hayti Pws	Hayti	0.48
Bonne Terre Northeast WWTP	Bonne Terre	0.47
Holden Municipal WWTF	Holden	0.47
Houston Pws-Well # 2 Agusta St Treatment	Houston	0.47
Versailles Pws-#2 Newton & Walnut Treatment	Versailles	0.46
Reeds Spring WWTP	Reeds Spring	0.46
Tipton WWTP	Tipton	0.46
Algoa Correctional Center	Jefferson City	0.45
Mountain Grove East WWTP	Mountain Grove	0.44
Monroe City WWTP	Monroe City	0.44
Warsaw Pws	Warsaw	0.43
Bethany WWTF	Bethany	0.43
Bonne Terre Pws	Bonne Terre	0.43
Plattsburg Pws-Plattsburg - Treatment Plant	Plattsburg	0.43
Higginsville South WWTF	Higginsville	0.42
Mountain View WWTP	Mountain View	0.42
Licking Pws	Licking	0.42
Willow Springs WWTP	Willow Springs	0.42
Ava WWTP	Ava	0.41
Milan WWTP	Milan	0.4
Wellsville Pws	Wellsville	0.39
Rolla Vichy Road WWTP	Rolla	0.39
Piedmont Processing	Piedmont	0.39
Savannah WWTF	Savannah	0.38
Hermann Industrial Tract Lagoon	Hermann	0.38
Eagleville Wastewater Treatment Facility	Eagleville	0.38
Platte City Sanitary Sewer Interceptor	Platte City	0.38
Bakersfield WWTP	Bakersfield	0.37
Lexington WWTF	Lexington	0.37
Windsor Southwest WWTF	Windsor	0.37
Rogersville WWTP	Rogersville	0.37
Cassville WWTP	Cassville	0.37
Raintree Plantation	Hillsboro	0.36
Fair Grove WWTP	Fair Grove	0.36
Lcpwsd No.1 To Bobs Creek WWTF	Winfield	0.35
Campbell WWTF	Campbell	0.35
Odessa SE WWTP	Odessa	0.34
Knob Noster WWTF	Knob Noster	0.34
Steelville Pws	Steelville	0.34
Portageville WWTP	Portageville	0.34
Palmyra WWTP	Palmyra	0.34
Anderson WWTF	Anderson	0.33
Union East STP	Union	0.33
Shelbina WWTP	Shelbina	0.33
Doniphan Municipal WWTF	Doniphan	0.32
Moscow Mills WWTF	Moscow Mills	0.31
Ironton Pws	Ironton	0.31
Cainsville Pws	Cainsville	0.3
Senath Pws-Well #3 Witch Hat Well Treatment (1996)	Senath	0.3
Richland Pws	Richland	0.3
Higginsville North WWTF	Higginsville	0.29
Stockton Pws	Stockton	0.28
Cairo WWTF	Cairo	0.28
Buckner WWTP	Buckner	0.27
Clarence WWTF	Clarence	0.27
Humansville	Humansville	0.26
Marble Hill WWTF	Marble Hill	0.26
Fair Play WWTF	Fair Play	0.26
Slater Pws	Slater	0.26
Rockaway Beach	Rockaway Beach	0.26
Moberly Correctional Center WWTF	Moberly	0.25
New Haven Pws	New Haven	0.25
Marionville Water Supply C/o City Hall	Marionville	0.25
Jcpsd Lower Big River WWTP	House Springs	0.24
East Prairie WWTF	East Prairie	0.24
Bcrsd Rocky Fork WWTP	Columbia	0.24
Marceline WWTP	Marceline	0.24
Bloomfield WWTF	Bloomfield	0.23
St. Jude Industrial Park Dwtp	New Madrid	0.23
Benton WWTP	Benton	0.23

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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 October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · 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. “Wastewater treatment plants in Missouri.” Updated October 26, 2026. https://klarifi.io/facilities/missouri

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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