How many wastewater treatment plants are there in Oklahoma?

Klarifi tracks 231 publicly owned wastewater treatment plants in Oklahoma with a combined average flow of 254 million gallons per day, serving about 2,208,346 residents. 41 of them treat more than 1 MGD and 7 more than 10 MGD.

What is the largest wastewater treatment plant in Oklahoma?

Okc South Canadian Wwt in Oklahoma City is the largest plant in Oklahoma by average flow, treating about 39.41 MGD.

What treatment technologies are common in Oklahoma?

197 of Oklahoma's plants use lagoon systems and 18 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Oklahoma are up for renewal?

32 permits held by Oklahoma plants expire in 2026 and 35 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater Treatment Plants in Oklahoma

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

231 facilities · 254 MGD combined flow

Klarifi tracks 231 publicly owned wastewater treatment plants in Oklahoma with a combined average flow of 254 MGD, serving about 2,208,346 residents. 41 plants treat more than 1 MGD and 7 more than 10 MGD; 197 use lagoon systems and 18 have digesters or biogas infrastructure. The largest is Okc South Canadian Wwt in Oklahoma City at 39.41 MGD. 32 NPDES permits expire this year and 35 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 231 by average flow — browse the rest with the page links below.

231 plant locations in Oklahoma; dot size follows average flow.

NPDES permits and renewals in Oklahoma

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 Oklahoma →32 permits expiring in 2026 →35 permits expiring in 2027 →44 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Oklahoma

The 25 largest publicly owned wastewater treatment plants in Oklahoma 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)
Okc South Canadian Wwt	Oklahoma City	39.41	80	OK0036978	Jul 2029	—	189
Tmua South	Tulsa	18.57	42	OK0026239	May 2029	Aerated lagoons	21
Northside Wastewater Treatment Plant	Tulsa	17.9	42.6	OK0026221	Feb 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos	19
Ok City Water Util Trst-Deer Ck	Oklahoma City	14.07	15	OK0027561	Aug 2029	Clarifiers, Uncovered lagoons, Biogas balloons	39
Haikey Creek Wastewater Treatment Plant	Broken Arrow	11.94	16	OK0034363	Apr 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	3
Lawton, City Of	Lawton	11	18	OK0035246	Sep 2030	Clarifiers, Uncovered lagoons, Biogas silos	182
Norman (main) Wwt	Norman	10.7	16	OK0029190	Oct 2030	Clarifiers, Uncovered lagoons, Biogas silos	61
Edmond, City Of - Coffee Creek	Edmond	6.9	12	OK0026026	Oct 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	20
Ok City Water Util Trst-Chisholm	Edmond	5.61	10	OK0027553	Aug 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	21
Midwest City Wwt	Oklahoma City	4.95	15	OK0026841	Apr 2020	Clarifiers, Uncovered lagoons, Biogas balloons	42
City Of Moore WWTP	Moore	4.94	9	OK0027391	Dec 2028	—	3
Stillwater, City Of	Stillwater	4.65	10	OK0027057	Mar 2028	Clarifiers, Aerated lagoons, Biogas silos	9
Lynn Lane Waste Water Treatment Plant	Broken Arrow	4.64	8	OK0040053	Apr 2030	Aerated lagoons	53
Enid, City Of	Enid	4.56	12	OK0021628	Jul 2029	Clarifiers, Carrousels / oxidation ditches	7
Oowa / Tsc	Pryor	3.97	—	OK0034568	Aug 2029	Clarifiers, Aerated lagoons, Covered lagoons, Uncovered lagoons	1
City Of Muskogee Pollution Control Plant	Muskogee	3.9	13.74	OK0029131	Dec 2030	Clarifiers, Biogas silos	41
Ponca City, City Of	Ponca City	3.54	6.5	OK0026069	Mar 2031	Clarifiers, Aerated lagoons, Uncovered lagoons	0
Yukon, City Of	Yukon	3.06	1.8	OK0028584	Sep 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	43
Bixby Pulbic Works Auth -South	Bixby	2.62	2.8	OK0026913	Feb 2029	Aerated lagoons	50
Tahlequah Pwa	Tahlequah	2.58	5.27	OK0026964	Jun 2010	Clarifiers, Uncovered lagoons	227
Owasso Public Works Authority	Owasso	2.51	4.2	OK0020303	Jul 2028	Clarifiers, Carrousels / oxidation ditches	4
Okmulgee WWTP	Okmulgee	2.48	10	OK0028134	May 2022	Clarifiers, Uncovered lagoons	93
City Of Ardmore Wastewater Treatment Plant	Ardmore	2.42	5.9	OK0038440	Apr 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	160
Altus SE Wastewater Treatment Plant	Altus	2.35	3.5	OK0028037	Apr 2030	Clarifiers, Uncovered lagoons	150
Sapulpa WWTF	Sapulpa	2.1	3.5	OK0043974	Aug 2030	Uncovered lagoons	77

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

Oklahoma plants by treatment technology

Lagoon systems (197)Activated sludge and clarifiers (79)Oxidation ditches (29)Anaerobic digesters and biogas (18)

All 231 plants in Oklahoma

Facility	City	Flow (MGD)
Okc South Canadian Wwt	Oklahoma City	39.41
Tmua South	Tulsa	18.57
Northside Wastewater Treatment Plant	Tulsa	17.9
Ok City Water Util Trst-Deer Ck	Oklahoma City	14.07
Haikey Creek Wastewater Treatment Plant	Broken Arrow	11.94
Lawton, City Of	Lawton	11
Norman (main) Wwt	Norman	10.7
Edmond, City Of - Coffee Creek	Edmond	6.9
Ok City Water Util Trst-Chisholm	Edmond	5.61
Midwest City Wwt	Oklahoma City	4.95
City Of Moore WWTP	Moore	4.94
Stillwater, City Of	Stillwater	4.65
Lynn Lane Waste Water Treatment Plant	Broken Arrow	4.64
Enid, City Of	Enid	4.56
Oowa / Tsc	Pryor	3.97
City Of Muskogee Pollution Control Plant	Muskogee	3.9
Ponca City, City Of	Ponca City	3.54
Yukon, City Of	Yukon	3.06
Bixby Pulbic Works Auth -South	Bixby	2.62
Tahlequah Pwa	Tahlequah	2.58
Owasso Public Works Authority	Owasso	2.51
Okmulgee WWTP	Okmulgee	2.48
City Of Ardmore Wastewater Treatment Plant	Ardmore	2.42
Altus SE Wastewater Treatment Plant	Altus	2.35
Sapulpa WWTF	Sapulpa	2.1
Durant City Utilities Auth	Durant	2.1
Del City Municipal Svcs. Auth	Del City	2.08
Jenks Wastewater Treat. Plant	Jenks	1.92
Duncan Public Utilities Auth	Duncan	1.75
Ada, City Of	Ada	1.75
Mustang Improvement Authority	Mustang	1.66
Sand Springs Main WWTP	Sand Springs	1.59
Foss Reservoir M.C.D.	Foss	1.5
El Reno Municipal Authority	El Reno	1.46
Mcalester, City Of - West Plant	Mcalester	1.46
Miami WWTF-SE Plant	Miami	1.43
Chickasha WWTP	Chickasha	1.36
Shawnee Municipal Auth-South	Shawnee	1.26
City Of Sallisaw Solid Waste Disposal Facility	Sallisaw	1.23
Weatherford Public Works Authority	Weatherford	1.18
Guymon City Of	Guymon	1.06
Vinita Wwt	Vinita	1
Shawnee Municipal Auth- North	Shawnee	0.94
Seminole Wwt	Seminole	0.93
Tulsa MUA-Lower Bird Ck Plant	Catoosa	0.93
Coweta Pwa	Coweta	0.92
Poteau, City Of	Poteau	0.88
Collinsville, City Of	Collinsville	0.83
Mcalester East WWTP	Mcalester	0.82
Cushing, City Of - South STP	Cushing	0.82
Skiatook, Town Of	Skiatook	0.8
Blackwell, City Of	Blackwell	0.79
Hugo Municipal Authority	Hugo	0.77
Guthrie	Guthrie	0.76
Idabel Public Works Authority	Idabel	0.76
Pryor Creek WWTP	Pryor	0.76
Clinton, City Of	Clinton	0.71
Glenpool Wwt	Glenpool	0.64
Atoka, City Of	Atoka	0.62
Purcell Wwt	Purcell	0.6
Sulphur Municipal Authority	Sulphur	0.58
Kingfisher	Kingfisher	0.56
Grove Msa	Grove	0.54
Wagoner County Rwsg & Swm D#4	Coweta	0.52
Nowata, City Of	Nowata	0.52
Anadarko Pwa	Anadarko	0.5
Newcastle Public Works Auth.	Newcastle	0.5
Chickasaw Tribal Utilities Authority	Thackerville	0.48
Lexington Public Works Auth	Lexington	0.47
Holdenville Pwa	Holdenville	0.46
Noble Utilities Auth - North	Noble	0.46
Antlers Pwa	Antlers	0.46
Wagoner	Wagoner	0.44
Heavener Utility Authority	Heavener	0.43
Madill Pwa	Madill	0.43
Drumright Utilities Trust	Drumright	0.41
Dewey Public Works Authority	Dewey	0.41
Tecumseh, City Of	Tecumseh	0.41
Stilwell Area Development Auth	Stilwell	0.4
Jay Utilities Authority	Jay	0.4
Rogers County Rsd #1	Claremore	0.4
Bristow Municipal Authority	Bristow	0.39
Davis, City Of	Davis	0.38
Eufaula Public Works Authority	Eufaula	0.37
Okemah Utilities Authority	Okemah	0.36
Wewoka Public Works Authority-Wewoka WTP	Wewoka	0.35
Roland, Town Of	Roland	0.35
Muldrow Utility Authority	Muldrow	0.34
Fort Gibson	Fort Gibson	0.34
City Of Seneca	West Seneca	0.32
Harrah Pwa	Harrah	0.31
Stigler Municipal Improvement Authority	Stigler	0.31
Checotah WWTP	Checotah	0.3
Calera Pwa	Calera	0.3
Lone Grove W&s Trust Auth-East	Lone Grove	0.29
Wilburton Pwa -Industrial Park	Wilburton	0.28
Chouteau Pwa	Chouteau	0.28
Mcloud Pwa	Mcloud	0.27
Watonga, City Of	Watonga	0.27
Langston WWTP	Langston	0.26
Perry, City Of	Perry	0.24
Westville Utility Auth	Westville	0.22
Wynnewood Water & Light	Wynnewood	0.21
Perkins Wwt	Perkins	0.2
Pocola Municipal Authority	Pocola	0.2
Krebs Utilities Authority	Krebs	0.19
Tishomingo, City Of	Tishomingo	0.19
Chandler Municipal Authority	Chandler	0.18
Stroud Ua-North Plant	Stroud	0.18
Spiro Mia	Spiro	0.18
Mannford Wwt	Mannford	0.17
Cherokee Former City Hall	Cherokee	0.17
Coalgate Pwa	Coalgate	0.17
Cordell, City Of	Cordell	0.15
Marietta, City Of	Marietta	0.15
Bokchito, City Of	Bokchito	0.15
Salina Public Works Auth	Salina	0.15
Meeker, Town Of	Meeker	0.15
Prague, City Of	Prague	0.14
Barnsdall, City Of	Barnsdall	0.13
Lindsay, City Of	Lindsay	0.12
Sperry Pwa Wwt	Sperry	0.12
Cleveland South WWTP	Cleveland	0.11
Ottawa Co Rwd #1	Wyandotte	0.11
Colbert Wwt	Colbert	0.11
Pawhuska, City Of	Pawhuska	0.11
Spencer, City Of	Spencer	0.1
Carnegie Public Works Auth.	Carnegie	0.1
Healdton Wwt	Healdton	0.1
Commerce-Cl2 Station - Well 5	Commerce	0.09
Inola Public Works Authority	Inola	0.09
Town Of Vian / Vian Pwa	Vian	0.09
Ok St Dept Of Corrections-Howa	Atoka	0.09
Cameron Pwa	Cameron	0.08
Leflore County Rw & Sd #5	Leflore	0.08
Panama Public Works Authority	Panama	0.08
Quapaw Pwa	Quapaw	0.08
Tuttle, City Of	Tuttle	0.08
Stratford Public Works Auth.	Stratford	0.08
Afton Pwa	Afton	0.07
Pawnee	Pawnee	0.07
Jim E. Hamilton Correctional Center	Hodgen	0.07
South Coffeyville Pwa	South Coffeyville	0.07
Kiefer Public Works Authority	Kiefer	0.07
Hydro, Town Of	Hydro	0.06
Haileyville, City Of	Haileyville	0.06
Ochelata Utilities Authority	Ochelata	0.06
Warner Utilities Authority	Warner	0.06
Maud, City Of	Maud	0.06
Langley Public Works Authority	Langley	0.05
Fairfax Public Works Auth	Fairfax	0.05
Morris, City Of -NW Plant	Morris	0.05
Kingston, Town Of	Kingston	0.05
Konawa, City Of	Konawa	0.04
Minco WWTF	Minco	0.04
Hulbert Public Works Authority	Hulbert	0.04
Weleetka Pwa	Weleetka	0.04
Allen, Town Of	Allen	0.03
Seneca-Cayuga Tribe	Miami	0.03
Oologah Public Works Authority	Oologah	0.03
Wright Public Works Authority	Wright City	0.03
Kaw City WWTF	Kaw City	0.03
Valley Brook, Town Of	Valley Brook	0.03
Porter WWTP	Porter	0.03
Oakland Pwa	Oakland	0.02
Pittsburg Co Rwd #20 -- Carlton Landing WWTF	Eufaula	0.02
Yale City Of / Yale City Of	Yale	0.02
Dewar WWTF	Dewar	0.01
Carney Public Utilities Auth	Carney	0.01
Hartshorne, City Of	Hartshorne	0.01
Gore Wwt	Gore	0.01
Talihina Pwa	Talihina	0.01
Haskell Co. Rwd #2	Kinta	0.01
Calvin Pwa	Calvin	0.0081
Pensacola Pub Works Authority	Pensacola	0.007
Candian Public Works Auth	Canadian	0.0069
Mill Creek, Town Of	Mill Creek	0.0054
Webbers Falls, City Of	Webbers Falls	0.0051
Mannford Pwa - East Plant	Mannford	0.005
Seminole Co. Rw & Swmd #3	Cromwell	0.004
Shady Point Pwa	Shady Point	0.0031
Crowder Pwa Wwt	Crowder	0.003
Stringtown Pwa	Stringtown	0.003
Pittsburg Co. Rwd #14	Pittsburg	0.0028
Francis Wwt	Francis	0.0004
Whitefield Mia	Whitefield	0.0001
Keota Pwa	Keota	0.00003
Altus, City Of - SW Wds	Altus	—
Ardmore, City Of -Industrial Park	Ardmore	—
Asher Utility Development Auth	Asher	—
Bokoshe Pwa	Bokoshe	—
Boswell, Town Of	Boswell	—
Boynton Pwa	Boynton	—
Braggs Pwa	Braggs	—
Chelsea, Town Of	Chelsea	—
Choctaw Co. Rw & Sd #1	Grant	—
Clayton Pwa	Clayton	—
Cyril, Town Of	Cyril	—
Delaware	Delaware	—
Depew, Town Of	Depew	—

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Wastewater treatment in Oklahoma: 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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