How many wastewater permits expire in Oklahoma in 2028?

44 NPDES permits held by publicly owned wastewater treatment plants in Oklahoma expire in 2028, covering a combined average flow of 43 MGD. The busiest month is Nov 2028 with 7 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in Oklahoma in 2028?

Northside Wastewater Treatment Plant in Tulsa, treating about 17.9 MGD under permit OK0026221, expiring Feb 2028.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, technology and compliance data. Verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free trial.

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Oklahoma wastewater permits expiring in 2028

Name: Oklahoma NPDES permits expiring in 2028
Creator: Klarifi
License: https://klarifi.io/terms-of-service

44 NPDES permits · 43 MGD combined average flow

44 publicly owned wastewater treatment plants in Oklahoma hold NPDES permits that expire during 2028, issued by Oklahoma Department of Environmental Quality. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.

An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.

Other years:

2026 (32)2027 (35)All Oklahoma NPDES permits →

Publicly owned wastewater treatment plants in Oklahoma with NPDES permits expiring in 2028, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Clinton, City Of	Clinton	0.71	OK0031011	Jan 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	120
South Coffeyville Pwa	South Coffeyville	0.07	OK0020117	Jan 2028	Uncovered lagoons	88
Northside Wastewater Treatment Plant	Tulsa	17.9	OK0026221	Feb 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos	19
Ada, City Of	Ada	1.75	OK0026115	Feb 2028	Aerated lagoons, Uncovered lagoons	3
Asher Utility Development Auth	Asher	—	OK0027154	Feb 2028	Uncovered lagoons	50
Fairland Pwa	Fairland	—	OK0021504	Feb 2028	Uncovered lagoons	3
Stillwater, City Of	Stillwater	4.65	OK0027057	Mar 2028	Clarifiers, Aerated lagoons, Biogas silos	9
Drumright Utilities Trust	Drumright	0.41	OK0022501	Mar 2028	—	1
Salina Public Works Auth	Salina	0.15	OK0020338	Apr 2028	Uncovered lagoons	0
Carnegie Public Works Auth.	Carnegie	0.1	OK0028401	Apr 2028	Clarifiers, Carrousels / oxidation ditches	1
Pawnee	Pawnee	0.07	OK0026654	Apr 2028	Uncovered lagoons	138
Konawa, City Of	Konawa	0.04	OK0021873	Apr 2028	Uncovered lagoons	26
Dewey Public Works Authority	Dewey	0.41	OK0022551	May 2028	Clarifiers, Carrousels / oxidation ditches	5
Mannford Wwt	Mannford	0.17	OK0022802	May 2028	Clarifiers, Aerated lagoons, Uncovered lagoons	0
Collinsville, City Of	Collinsville	0.83	OK0027375	Jun 2028	Aerated lagoons, Uncovered lagoons	92
Jay Utilities Authority	Jay	0.4	OK0031976	Jun 2028	Clarifiers, Uncovered lagoons	73
Porter WWTP	Porter	0.03	OK0027570	Jun 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	31
Pittsburg Co Rwd #20 -- Carlton Landing WWTF	Eufaula	0.02	OK0100625	Jun 2028	Uncovered lagoons	49
Boynton Pwa	Boynton	—	OK0034347	Jun 2028	Uncovered lagoons	0
Owasso Public Works Authority	Owasso	2.51	OK0020303	Jul 2028	Clarifiers, Carrousels / oxidation ditches	4
Duncan Public Utilities Auth	Duncan	1.75	OK0026638	Jul 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	380
Weatherford Public Works Authority	Weatherford	1.18	OK0021563	Jul 2028	Clarifiers, Carrousels / oxidation ditches	1
Chandler Municipal Authority	Chandler	0.18	OK0027120	Jul 2028	Aerated lagoons, Uncovered lagoons	53
Choctaw Co. Rw & Sd #1	Grant	—	OK0037826	Jul 2028	Uncovered lagoons	0
Bokchito, City Of	Bokchito	0.15	OK0027014	Aug 2028	Aerated lagoons, Uncovered lagoons	84
Wright Public Works Authority	Wright City	0.03	OK0032387	Aug 2028	Uncovered lagoons	156
Francis Wwt	Francis	0.0004	OK0036064	Aug 2028	Uncovered lagoons	29
Panama Public Works Authority	Panama	0.08	OK0031054	Sep 2028	Aerated lagoons, Uncovered lagoons	15
Weleetka Pwa	Weleetka	0.04	OK0028525	Sep 2028	Uncovered lagoons	22
Oakland Pwa	Oakland	0.02	OK0031933	Sep 2028	Uncovered lagoons	85
Pryor Creek WWTP	Pryor	0.76	OK0040479	Oct 2028	—	4
Davis, City Of	Davis	0.38	OK0021644	Oct 2028	—	84
Eufaula Public Works Authority	Eufaula	0.37	OK0035611	Oct 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	24
Mustang Improvement Authority	Mustang	1.66	OK0026816	Nov 2028	Aerated lagoons	96
Hugo Municipal Authority	Hugo	0.77	OK0028487	Nov 2028	Clarifiers, Uncovered lagoons	141
Perry, City Of	Perry	0.24	OK0027448	Nov 2028	Clarifiers, Uncovered lagoons	1
Kiefer Public Works Authority	Kiefer	0.07	OK0028771	Nov 2028	Aerated lagoons, Uncovered lagoons	117
Kingston, Town Of	Kingston	0.05	OK0027774	Nov 2028	Clarifiers, Uncovered lagoons	31
Hulbert Public Works Authority	Hulbert	0.04	OK0032328	Nov 2028	Uncovered lagoons	29
Keota Pwa	Keota	0.00003	OK0031186	Nov 2028	Uncovered lagoons	123
City Of Moore WWTP	Moore	4.94	OK0027391	Dec 2028	—	3
Pawhuska, City Of	Pawhuska	0.11	OK0028274	Dec 2028	Aerated lagoons, Uncovered lagoons	4
Talihina Pwa	Talihina	0.01	OK0028380	Dec 2028	Uncovered lagoons	19
Clayton Pwa	Clayton	—	OK0029157	Dec 2028	Uncovered lagoons	49

Oklahoma permit renewals in 2028: 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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