What is the largest wastewater treatment plant in Oklahoma?

Okc South Canadian Wwt in Oklahoma City, treating an average of 39.41 MGD under NPDES permit OK0036978. Tmua South in Tulsa is second at 18.57 MGD.

How much wastewater do Oklahoma’s largest plants treat?

The 50 largest plants treat 224 MGD combined, 88% of the flow reported by all 231 publicly owned plants in Oklahoma.

How is plant size measured?

By reported average daily flow in million gallons per day (MGD) from EPA discharge monitoring reports, the standard measure of a plant’s size. Design capacity, the flow a plant is permitted to treat, is usually higher and is shown on each profile.

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The 50 largest wastewater treatment plants in Oklahoma

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

Ranked by average flow · 224 MGD combined · 88% of the state's reported flow

Okc South Canadian Wwt in Oklahoma City is the largest publicly owned wastewater treatment plant in Oklahoma by reported average flow, treating about 39.41 million gallons per day. The 50 plants below treat 224 MGD between them, 88% of the flow reported by all 231 plants in the state, and serve about 1,777,037 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Oklahoma →The 100 largest US plants →Oklahoma NPDES permits →

The 50 largest publicly owned wastewater treatment plants in Oklahoma by average flow (MGD), with population served, NPDES permit, expiry, treatment technology and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Technology	Violations (3y)
1	Okc South Canadian Wwt	Oklahoma City	39.41	40,017	OK0036978	Jul 2029	—	189
2	Tmua South	Tulsa	18.57	147,101	OK0026239	May 2029	Aerated lagoons	21
3	Northside Wastewater Treatment Plant	Tulsa	17.9	181,670	OK0026221	Feb 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos	19
4	Ok City Water Util Trst-Deer Ck	Oklahoma City	14.07	124,013	OK0027561	Aug 2029	Clarifiers, Uncovered lagoons, Biogas balloons	39
5	Haikey Creek Wastewater Treatment Plant	Broken Arrow	11.94	112,205	OK0034363	Apr 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	3
6	Lawton, City Of	Lawton	11	91,687	OK0035246	Sep 2030	Clarifiers, Uncovered lagoons, Biogas silos	182
7	Norman (main) Wwt	Norman	10.7	128,026	OK0029190	Oct 2030	Clarifiers, Uncovered lagoons, Biogas silos	61
8	Edmond, City Of - Coffee Creek	Edmond	6.9	74,307	OK0026026	Oct 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	20
9	Ok City Water Util Trst-Chisholm	Edmond	5.61	74,455	OK0027553	Aug 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	21
10	Midwest City Wwt	Oklahoma City	4.95	57,288	OK0026841	Apr 2020	Clarifiers, Uncovered lagoons, Biogas balloons	42
11	City Of Moore WWTP	Moore	4.94	49,345	OK0027391	Dec 2028	—	3
12	Stillwater, City Of	Stillwater	4.65	41,163	OK0027057	Mar 2028	Clarifiers, Aerated lagoons, Biogas silos	9
13	Lynn Lane Waste Water Treatment Plant	Broken Arrow	4.64	90,643	OK0040053	Apr 2030	Aerated lagoons	53
14	Enid, City Of	Enid	4.56	49,583	OK0021628	Jul 2029	Clarifiers, Carrousels / oxidation ditches	7
15	Oowa / Tsc	Pryor	3.97	—	OK0034568	Aug 2029	Clarifiers, Aerated lagoons, Covered lagoons, Uncovered lagoons	1
16	City Of Muskogee Pollution Control Plant	Muskogee	3.9	36,790	OK0029131	Dec 2030	Clarifiers, Biogas silos	41
17	Ponca City, City Of	Ponca City	3.54	27,311	OK0026069	Mar 2031	Clarifiers, Aerated lagoons, Uncovered lagoons	0
18	Yukon, City Of	Yukon	3.06	23,339	OK0028584	Sep 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	43
19	Bixby Pulbic Works Auth -South	Bixby	2.62	6,660	OK0026913	Feb 2029	Aerated lagoons	50
20	Tahlequah Pwa	Tahlequah	2.58	16,463	OK0026964	Jun 2010	Clarifiers, Uncovered lagoons	227
21	Owasso Public Works Authority	Owasso	2.51	19,496	OK0020303	Jul 2028	Clarifiers, Carrousels / oxidation ditches	4
22	Okmulgee WWTP	Okmulgee	2.48	13,721	OK0028134	May 2022	Clarifiers, Uncovered lagoons	93
23	City Of Ardmore Wastewater Treatment Plant	Ardmore	2.42	25,352	OK0038440	Apr 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	160
24	Altus SE Wastewater Treatment Plant	Altus	2.35	17,853	OK0028037	Apr 2030	Clarifiers, Uncovered lagoons	150
25	Sapulpa WWTF	Sapulpa	2.1	23,073	OK0043974	Aug 2030	Uncovered lagoons	77
26	Durant City Utilities Auth	Durant	2.1	18,589	OK0039063	May 2030	Clarifiers, Uncovered lagoons, Biogas silos	197
27	Del City Municipal Svcs. Auth	Del City	2.08	24,067	OK0026085	Jul 2027	—	7
28	Jenks Wastewater Treat. Plant	Jenks	1.92	10,070	OK0037401	Aug 2030	Clarifiers, Carrousels / oxidation ditches	18
29	Duncan Public Utilities Auth	Duncan	1.75	23,714	OK0026638	Jul 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	380
30	Ada, City Of	Ada	1.75	16,738	OK0026115	Feb 2028	Aerated lagoons, Uncovered lagoons	3
31	Mustang Improvement Authority	Mustang	1.66	14,594	OK0026816	Nov 2028	Aerated lagoons	96
32	Sand Springs Main WWTP	Sand Springs	1.59	18,094	OK0030864	Feb 2031	Clarifiers, Aerated lagoons	40
33	Foss Reservoir M.C.D.	Foss	1.5	—	OK0041491	May 2012	Clarifiers, Uncovered lagoons	0
34	El Reno Municipal Authority	El Reno	1.46	—	OK0100382	Sep 2027	Uncovered lagoons	42
35	Mcalester, City Of - West Plant	Mcalester	1.46	9,368	OK0026093	May 2026	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	96
36	Miami WWTF-SE Plant	Miami	1.43	13,176	OK0031798	Jul 2025	Aerated lagoons	2
37	Chickasha WWTP	Chickasha	1.36	18,210	OK0026018	Dec 2026	Clarifiers, Uncovered lagoons	4
38	Shawnee Municipal Auth-South	Shawnee	1.26	22,675	OK0026051	Nov 2024	Clarifiers, Uncovered lagoons, Biogas silos	22
39	City Of Sallisaw Solid Waste Disposal Facility	Sallisaw	1.23	8,410	OK0028169	Oct 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	14
40	Weatherford Public Works Authority	Weatherford	1.18	11,415	OK0021563	Jul 2028	Clarifiers, Carrousels / oxidation ditches	1
41	Guymon City Of	Guymon	1.06	18,750	OK0045713	Mar 2027	Clarifiers, Covered lagoons, Uncovered lagoons	22
42	Vinita Wwt	Vinita	1	6,820	OK0037788	Jun 2030	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	91
43	Shawnee Municipal Auth- North	Shawnee	0.94	7,558	OK0037893	Jan 2023	Clarifiers, Uncovered lagoons	26
44	Seminole Wwt	Seminole	0.93	7,488	OK0022870	Aug 2029	Clarifiers, Uncovered lagoons, Biogas silos	73
45	Tulsa MUA-Lower Bird Ck Plant	Catoosa	0.93	17,371	OK0042935	Jul 2029	Clarifiers, Carrousels / oxidation ditches	0
46	Coweta Pwa	Coweta	0.92	7,522	OK0020281	May 2021	Aerated lagoons, Uncovered lagoons	106
47	Poteau, City Of	Poteau	0.88	8,365	OK0021610	Jan 2027	Clarifiers, Uncovered lagoons	4
48	Collinsville, City Of	Collinsville	0.83	4,291	OK0027375	Jun 2028	Aerated lagoons, Uncovered lagoons	92
49	Mcalester East WWTP	Mcalester	0.82	9,370	OK0026107	Dec 2026	Aerated lagoons, Uncovered lagoons, Biogas silos	50
50	Cushing, City Of - South STP	Cushing	0.82	8,821	OK0026701	Apr 2031	Uncovered lagoons, Biogas silos	19

Largest plants 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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