How many wastewater treatment plants are there in Missouri?

Klarifi tracks 593 publicly owned wastewater treatment plants in Missouri with a combined average flow of 488 million gallons per day, serving about 4,108,253 residents. 61 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 90.1 MGD.

What treatment technologies are common in Missouri?

141 of Missouri's plants use lagoon systems and 21 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Missouri are up for renewal?

46 permits held by Missouri plants expire in 2026 and 65 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

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; 141 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, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. 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 25 largest publicly owned wastewater treatment plants in Missouri by average flow, with NPDES permit, expiry, treatment technology and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Metropolitan St. Louis Sewer District Bissell Point WWTP	St. Louis	90.1	—	MO0025178	Aug 2031	Clarifiers, Biogas balloons	14
Metropolitan St. Louis Sewer District Lemay WWTP	St. Louis	79.3	—	MO0025151	Aug 2031	Clarifiers, Biogas silos	0
Little Blue Valley Sewer District	Independence	29.2	—	MOL101087	Dec 2030	Clarifiers, Aerated lagoons, Covered lagoons, Carrousels / oxidation ditches, Biogas silos, Biogas balloons	14
Southwest WWTP	Springfield	25.32	—	MO0049522	Jul 2025	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos, Biogas balloons	0
St. Joseph Water Protection Facility	Saint Joseph	18.27	—	MO0023043	Nov 2025	Clarifiers, Biogas silos	4
MSD Coldwater WWTP	Florissant	14.3	—	MO0025160	Aug 2031	Clarifiers, Biogas silos	1
Kc, Westside WWTP	Kansas City	12.54	—	MO0024929	Jun 2026	Clarifiers, Biogas silos, Biogas balloons	2
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant	Valley Park	10.4	—	MO0101362	Aug 2031	Clarifiers, Carrousels / oxidation ditches, Biogas silos	0
MSD Lower Meramec WWTP	St. Louis	7.6	—	MO0127949	Aug 2031	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos, Biogas balloons	0
O' Fallon Wastewater Treatment Plant	O'Fallon	6.7	—	MO0028720	Mar 2025	Clarifiers, Uncovered lagoons, Biogas balloons	0
Joplin Turkey Creek WWTP	Joplin	5.7	—	MO0103349	Sep 2022	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos	64
Shoal Creek Wastewater Treatment Facility	Joplin	5.6	—	MO0023256	Mar 2023	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos	9
Jefferson City Rwrf	Jefferson City	5.36	—	MO0094846	Mar 2025	Clarifiers	0
Rock Creek Waste Treatment	Independence	5.07	—	MO0089681	Mar 2024	Clarifiers	12
St Peters Pws	Saint Peters	4.83	—	MO0030970	Dec 2024	Clarifiers, Carrousels / oxidation ditches, Biogas silos	0
Cape Girardeau WWTP	Cape Girardeau	4.36	—	MO0136328	Jun 2024	—	0
Wentzville Pws	Wentzville	4.34	—	MO0093599	Mar 2024	Clarifiers	4
Dcsd Wastewater Treatment Plant 2	Weldon Spring	4.28	—	MO0116572	Dec 2025	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
Springfield NW WWTP	Springfield	4.06	—	MO0103039	Jul 2025	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas balloons	0
Duckett Creek Sanitation District Treatment Plant #1	Saint Charles	4.04	—	MO0085472	Jun 2021	Clarifiers, Carrousels / oxidation ditches	0
St Charles Missouri River WWTP	St. Charles	3.73	—	MO0058351	Sep 2025	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	0
MSD Fenton Waste Water Treatment Plant	Fenton	3.6	6.75	MO0086126	Dec 2022	Clarifiers, Carrousels / oxidation ditches	0
Blue Springs, Sni A Bar WWTF	Grain Valley	3.5	—	MO0028886	Nov 2028	Clarifiers, Aerated lagoons, Uncovered lagoons	16
Poplar Bluff Municipal WWTP	Poplar Bluff	3.18	—	MO0043648	Sep 2024	Covered lagoons, Uncovered lagoons	4
Carthage WWTP	Carthage	2.92	—	MO0039136	Mar 2023	Clarifiers, Uncovered lagoons	4

The 50 largest plants in Missouri →Missouri capital improvement plans →

Missouri plants by treatment technology

UV disinfection (297)Lagoon systems (290)Activated sludge and clarifiers (97)Chlorine disinfection (96)Oxidation ditches (57)Anaerobic digesters and biogas (26)Nutrient removal (23)

All 593 plants in Missouri

Facility	City	Flow (MGD)
Metropolitan St. Louis Sewer District Bissell Point WWTP	St. Louis	90.1
Metropolitan St. Louis Sewer District Lemay WWTP	St. Louis	79.3
Little Blue Valley Sewer District	Independence	29.2
Southwest WWTP	Springfield	25.32
St. Joseph Water Protection Facility	Saint Joseph	18.27
MSD Coldwater WWTP	Florissant	14.3
Kc, Westside WWTP	Kansas City	12.54
Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant	Valley Park	10.4
MSD Lower Meramec WWTP	St. Louis	7.6
O' Fallon Wastewater Treatment Plant	O'Fallon	6.7
Joplin Turkey Creek WWTP	Joplin	5.7
Shoal Creek Wastewater Treatment Facility	Joplin	5.6
Jefferson City Rwrf	Jefferson City	5.36
Rock Creek Waste Treatment	Independence	5.07
St Peters Pws	Saint Peters	4.83
Cape Girardeau WWTP	Cape Girardeau	4.36
Wentzville Pws	Wentzville	4.34
Dcsd Wastewater Treatment Plant 2	Weldon Spring	4.28
Springfield NW WWTP	Springfield	4.06
Duckett Creek Sanitation District Treatment Plant #1	Saint Charles	4.04
St Charles Missouri River WWTP	St. Charles	3.73
MSD Fenton Waste Water Treatment Plant	Fenton	3.6
Blue Springs, Sni A Bar WWTF	Grain Valley	3.5
Poplar Bluff Municipal WWTP	Poplar Bluff	3.18
Carthage WWTP	Carthage	2.92
Hannibal Pws	Hannibal	2.69
Monett Wastewater Treatment Plant	Monett	2.5
Branson Compton Drive WWTP	Branson	2.26
Sikeston WWTP	Sikeston	2.23
Lebanon WWTP	Lebanon	2.22
Marshall SE WWTP	Marshall	2.22
Rolla Pws-Well 4 - E 10th St	Rolla	2.17
Kirksville WWTP	Kirksville	2.02
Hollister WWTF	Hollister	2
Neosho WWTP	Neosho	2
Festus-Crystal City WWTP	Crystal City	1.81
Branson Cooper Creek WWTP	Branson	1.73
Npsd Interim Saline Creek Regional WWTP	Fenton	1.71
Washington WWTP	Washington	1.65
Center Creek WWTP	Webb City	1.57
Camelot Estates WWTP	Camdenton	1.55
Pleasant Hill Pws	Pleasant Hill	1.53
Nixa WWTF	Nixa	1.52
West Plains Pws-West Plains Treatment Plt	West Plains	1.46
Kimmswick WWTP	Imperial	1.42
Republic WWTP	Republic	1.38
Fulton WWTP	Fulton	1.37
Lake Of The Ozarks Regional WWTP 1	Lake Ozark	1.36
Sunny Slope Country Club Drive WWTP	Camdenton	1.35
Sedalia Central WWTP	Sedalia	1.28
Moberly WWTP	Moberly	1.25
Waynesville Pws	Waynesville	1.18
Troy Southeast WWTP	Troy	1.16
Warrenton Pws	Warrenton	1.16
Park Hills Mineral Belt WWTP	Bonne Terre	1.14
Mawc, Eureka WWTF	Eureka	1.13
Clinton WWTP	Clinton	1.09
Farmington East WWTP	Farmington	1.04
Kearney WWTP	Kearney	1.03
Ozark WWTF	Ozark	1.03
Excelsior Springs Waste Water Treatment Facility	Excelsior Springs	1
Macon WWTP	Macon	0.98
Farmington Pws	Farmington	0.98
Chillicothe WWTP	Chillicothe	0.96
Nevada WWTF	Nevada	0.94
Maryville WWTP	Maryville	0.92
California South WWTF	California	0.92
Perryville SE WWTP	Perryville	0.9
Jackson WWTP	Jackson	0.9
Richmond South WWTP	Richmond	0.87
El Dorado Springs	El Dorado Springs	0.87
Pacific WWTP	Pacific	0.85
Harrisonville Pws	Harrisonville	0.84
Kc Rocky Branch WWTP	Kansas City	0.81
Sullivan WWTP	Sullivan	0.81
Aurora City Of Street Dept	Aurora	0.79
Pcrsd Brush Creek WWTP	Parkville	0.77
Sedalia Southeast WWTP	Sedalia	0.77
Cuba Pws-Well #5 American Way Dr Treatment	Cuba	0.73
Salem Municipal WWTF	Salem	0.73
Warrensburg West WWTP	Warrensburg	0.73
Cameron WWTP	Cameron	0.72
Warrensburg East WWTP	Warrensburg	0.71
Pevely WWTP	Pevely	0.7
Caruthersville WWTF	Caruthersville	0.66
Union Pws	Union	0.65
Windsor Southwest WWTF	Windsor	0.65
St. James WWTP	St. James	0.65
Carl Junction Pws	Carl Junction	0.64
St Robert Pws	St Robert	0.64
Boonville WWTP	Boonville	0.63
Pike Creek Sewer District WWTF	Poplar Bluff	0.61
Shawnee Bend	Sunrise Beach	0.6
Oak Grove WWTF	Oak Grove	0.6
Mount Vernon Pws	Mount Vernon	0.59
Sedalia North WWTP	Sedalia	0.58
Winfield WWTF	Winfield	0.58
Lake Hannibal Estate WWTF	Hannibal	0.56
Kennett WWTF	Kennett	0.56
Charleston WWTF	Charleston	0.54
Dexter East WWTF	Dexter	0.54
Bakersfield WWTP	Bakersfield	0.51
Marshfield	Marshfield	0.51
Dcsd, Treatment Plant 4	Wentzville	0.51
Hayti Pws	Hayti	0.5
Platte City Sanitary Sewer Interceptor	Platte City	0.5
Cleveland	Cleveland	0.49
Elk Valley WWTF	Ozark	0.49
Glaize Creek Sewer District WWTP	Barnhart	0.48
Carrollton WWTP	Carrollton	0.48
Brookfield WWTP	Brookfield	0.48
Fredericktown Pws-Fredericktown - Treatment Plant	Fredericktown	0.48
Potosi Pws	Potosi	0.48
Milan WWTP	Milan	0.47
Camdenton Pws	Camdenton	0.46
Newburg WWTP	Newburg	0.45
Lamar WWTF	Lamar	0.45
St Clair Pws	St. Clair	0.44
Rolla Vichy Road WWTP	Rolla	0.44
Northeast Correctional Center WWTF	Bowling Green	0.44
Ava WWTP	Ava	0.44
De Soto WWTP	De Soto	0.44
Canton WWTP	Canton	0.43
Forsyth Pws-Well # 5 - Old Forsyth	Forsyth	0.43
Algoa Correctional Center	Jefferson City	0.42
Cassville WWTP	Cassville	0.41
Clark Pws-Chlorine Booster Station	Clark	0.4
Dexter West WWTP	Dexter	0.39
Campbell WWTF	Campbell	0.38
Eldon WWTP	Eldon	0.38
Piedmont Processing	Piedmont	0.38
Portageville WWTP	Portageville	0.37
Theodosia WWTP	Theodosia	0.37
Mountain Grove East WWTP	Mountain Grove	0.36
Lcpwsd No.1 To Bobs Creek WWTF	Winfield	0.36
Ashland WWTF	Ashland	0.36
Peculiar WWTP	Peculiar	0.36
Warsaw Pws	Warsaw	0.35
Hermann Industrial Tract Lagoon	Hermann	0.34
Buffalo Head Start	Buffalo	0.34
Willow Springs WWTP	Willow Springs	0.33
Licking Pws	Licking	0.33
Anderson WWTF	Anderson	0.33
Steelville Pws	Steelville	0.33
Fayette WWTF	Fayette	0.32
Tipton WWTP	Tipton	0.32
Lexington WWTF	Lexington	0.32
Plattsburg Pws-Plattsburg - Treatment Plant	Plattsburg	0.32
Marionville Water Supply C/o City Hall	Marionville	0.31
Scott City Pws	Scott City	0.31
Mountain View WWTP	Mountain View	0.3
Senath Pws-Well #3 Witch Hat Well Treatment (1996)	Senath	0.3
Savannah WWTF	Savannah	0.3
Rogersville WWTP	Rogersville	0.29
Higginsville South WWTF	Higginsville	0.29
Cainsville Pws	Cainsville	0.29
Hillsboro North WWTF	Hillsboro	0.28
Pulaski Co. Sd # 1, Weeks Hollow WWTF	Waynesville	0.27
Doniphan Municipal WWTF	Doniphan	0.27
Fair Grove WWTP	Fair Grove	0.26
Shelbina WWTP	Shelbina	0.25
Rockaway Beach	Rockaway Beach	0.25
Thayer WWTP	Thayer	0.25
Richland Pws	Richland	0.25
Cairo WWTF	Cairo	0.25
Houston Pws-Well # 2 Agusta St Treatment	Houston	0.25
Pierce City WWTF	Pierce City	0.25
Moscow Mills WWTF	Moscow Mills	0.25
Bonne Terre Northeast WWTP	Bonne Terre	0.24
Union East STP	Union	0.23
Benton WWTP	Benton	0.23
Bonne Terre Pws	Bonne Terre	0.23
Mansfield Pws-Treatment Plant	Mansfield	0.23
St. Jude Industrial Park Dwtp	New Madrid	0.22
Odessa SE WWTP	Odessa	0.22
Stockton Pws	Stockton	0.22
Raintree Plantation	Hillsboro	0.22
Palmyra WWTP	Palmyra	0.22
Miner WWTF	Miner	0.21
Linn Wastewater Treatment Facility	Linn	0.21
Bcrsd Rocky Fork WWTP	Columbia	0.21
Marble Hill WWTF	Marble Hill	0.2
Monroe City WWTP	Monroe City	0.2
Albany Pws	Albany	0.2
Lake Lotawana WWTP #1	Lake Lotawana	0.19
Slater Pws	Slater	0.19
Hillsboro WWTP	Hillsboro	0.18
Buckner WWTP	Buckner	0.18
Montgomery City Pws	Montgomery City	0.18
Higginsville North WWTF	Higginsville	0.18
East Prairie WWTF	East Prairie	0.17
Miller WWTF	Miller	0.17
New Haven Pws	New Haven	0.17
Jcpsd Lower Big River WWTP	House Springs	0.17
Mokane WWTF	Mokane	0.17
Owensville WWTF	Owensville	0.16
Kimberling City WWTP	Kimberling City	0.16
Normac Sewer District WWTP	Camdenton	0.16
Jasper WWTF	Jasper	0.16
Seymour Pws	Seymour	0.16

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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 11, 2026.

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