How many wastewater permits expire in Oklahoma in 2026?

32 NPDES permits held by publicly owned wastewater treatment plants in Oklahoma expire in 2026, covering a combined average flow of 6 MGD. The busiest month is Jul 2026 with 17 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 2026?

Mcalester, City Of - West Plant in Mcalester, treating about 1.46 MGD under permit OK0026093, expiring May 2026.

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 2026

Name: Oklahoma NPDES permits expiring in 2026
Creator: Klarifi
License: https://klarifi.io/terms-of-service

32 NPDES permits · 6 MGD combined average flow

32 publicly owned wastewater treatment plants in Oklahoma hold NPDES permits that expire during 2026, 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:

2027 (35)2028 (44)All Oklahoma NPDES permits →

Publicly owned wastewater treatment plants in Oklahoma with NPDES permits expiring in 2026, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Mcalester, City Of - West Plant	Mcalester	1.46	OK0026093	May 2026	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	96
Krebs Utilities Authority	Krebs	0.19	OK0030686	Jun 2026	Aerated lagoons, Carrousels / oxidation ditches	6
Wynnewood Water & Light	Wynnewood	0.21	OK0028282	Jul 2026	Clarifiers, Uncovered lagoons, Biogas silos	21
Coalgate Pwa	Coalgate	0.17	OKG580028	Jul 2026	Uncovered lagoons	74
Lindsay, City Of	Lindsay	0.12	OKG580021	Jul 2026	Aerated lagoons, Uncovered lagoons	62
Colbert Wwt	Colbert	0.11	OKG580017	Jul 2026	Aerated lagoons, Uncovered lagoons	122
Ok St Dept Of Corrections-Howa	Atoka	0.09	OKG580069	Jul 2026	Aerated lagoons, Uncovered lagoons	73
Cameron Pwa	Cameron	0.08	OKG580074	Jul 2026	Uncovered lagoons	2
Leflore County Rw & Sd #5	Leflore	0.08	OKG580052	Jul 2026	Uncovered lagoons	4
Tuttle, City Of	Tuttle	0.08	OKG580054	Jul 2026	Uncovered lagoons	55
Mill Creek, Town Of	Mill Creek	0.0054	OKG580014	Jul 2026	Uncovered lagoons	42
Shady Point Pwa	Shady Point	0.0031	OKG580051	Jul 2026	—	14
Whitefield Mia	Whitefield	0.0001	OKG580050	Jul 2026	Uncovered lagoons	20
Gans, Town Of	Gans	—	OKG580068	Jul 2026	Uncovered lagoons	67
North Enid, Town Of	North Enid	—	OKG580002	Jul 2026	Uncovered lagoons	1
Okay Pwa	Okay	—	OKG580020	Jul 2026	Aerated lagoons, Uncovered lagoons	107
Stuart Pwa	Stuart	—	OKG580022	Jul 2026	Uncovered lagoons	0
Valliant Pwa	Valliant	—	OKG580065	Jul 2026	Uncovered lagoons	30
Verden, Town Of	Verden	—	OKG580049	Jul 2026	Uncovered lagoons	2
Heavener Utility Authority	Heavener	0.43	OK0038407	Aug 2026	Aerated lagoons, Uncovered lagoons	2
Sperry Pwa Wwt	Sperry	0.12	OK0033464	Sep 2026	Aerated lagoons	12
Stratford Public Works Auth.	Stratford	0.08	OK0021865	Sep 2026	Aerated lagoons, Uncovered lagoons	53
Dewar WWTF	Dewar	0.01	OK0027537	Sep 2026	Uncovered lagoons	29
Pittsburg Co. Rwd #14	Pittsburg	0.0028	OK0027782	Sep 2026	—	24
Quinton	Quinton	—	OK0030694	Sep 2026	Uncovered lagoons	68
Candian Public Works Auth	Canadian	0.0069	OK0035297	Oct 2026	Uncovered lagoons	40
Crowder Pwa Wwt	Crowder	0.003	OK0035301	Oct 2026	Aerated lagoons, Uncovered lagoons	30
Holdenville Pwa	Holdenville	0.46	OK0028428	Nov 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	313
Stroud Ua-North Plant	Stroud	0.18	OK0027367	Nov 2026	—	5
Wister, City Of	Wister	—	OK0034118	Nov 2026	Aerated lagoons, Uncovered lagoons	4
Chickasha WWTP	Chickasha	1.36	OK0026018	Dec 2026	Clarifiers, Uncovered lagoons	4
Mcalester East WWTP	Mcalester	0.82	OK0026107	Dec 2026	Aerated lagoons, Uncovered lagoons, Biogas silos	50

Oklahoma permit renewals in 2026: 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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