Who issues NPDES permits in Oklahoma?

Oklahoma Department of Environmental Quality issues and enforces NPDES permits for wastewater discharges in Oklahoma. Klarifi tracks 231 permits held by publicly owned treatment plants in the state.

How many NPDES permits in Oklahoma are expired or administratively continued?

28 permits are administratively continued (the plant applied for renewal and the old permit stays in force) and 6 are recorded as expired, out of 231 permits tracked. 195 are effective.

How many Oklahoma wastewater permits come up for renewal soon?

32 in 2026, 35 in 2027 and 44 in 2028. Each year has its own renewal calendar with the plants listed.

How do I look up an NPDES permit number?

Enter the permit number (two letters and seven characters, for example TX0021873) or the plant name in the lookup on the NPDES page; each result opens the plant profile with status, expiry, design flow and the three-year violation count.

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NPDES permits in Oklahoma

Name: NPDES permits held by wastewater treatment plants in Oklahoma
Creator: Klarifi
License: https://klarifi.io/terms-of-service

231 permits held by publicly owned wastewater treatment plants · issued by ODEQ

Effective

195

Administratively continued

Expired

Total tracked

231

Oklahoma Department of Environmental Quality (ODEQ) runs the NPDES program in Oklahoma under delegation from EPA Region 6, issuing and enforcing the discharge permits listed here. Klarifi tracks 231 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →

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.

Permit renewals by year

2026: 32 permits →2027: 35 permits →2028: 44 permits →

2029: 41 permits

2030: 40 permits

2031: 23 permits

Largest permit holders in Oklahoma

The 25 largest publicly owned wastewater treatment plants in Oklahoma by permitted design flow, with NPDES permit number, status and expiry. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Status	Expires	Violations (3y)
Okc South Canadian Wwt	Oklahoma City	39.41	80	OK0036978	Effective	Jul 2029	189
Northside Wastewater Treatment Plant	Tulsa	17.9	42.6	OK0026221	Effective	Feb 2028	19
Tmua South	Tulsa	18.57	42	OK0026239	Effective	May 2029	21
Lawton, City Of	Lawton	11	18	OK0035246	Effective	Sep 2030	182
Haikey Creek Wastewater Treatment Plant	Broken Arrow	11.94	16	OK0034363	Effective	Apr 2030	3
Norman (main) Wwt	Norman	10.7	16	OK0029190	Effective	Oct 2030	61
Midwest City Wwt	Oklahoma City	4.95	15	OK0026841	Administratively continued	Apr 2020	42
Ok City Water Util Trst-Deer Ck	Oklahoma City	14.07	15	OK0027561	Effective	Aug 2029	39
City Of Muskogee Pollution Control Plant	Muskogee	3.9	13.74	OK0029131	Effective	Dec 2030	41
Edmond, City Of - Coffee Creek	Edmond	6.9	12	OK0026026	Effective	Oct 2030	20
Enid, City Of	Enid	4.56	12	OK0021628	Effective	Jul 2029	7
Ok City Water Util Trst-Chisholm	Edmond	5.61	10	OK0027553	Effective	Aug 2029	21
Okmulgee WWTP	Okmulgee	2.48	10	OK0028134	Administratively continued	May 2022	93
Stillwater, City Of	Stillwater	4.65	10	OK0027057	Effective	Mar 2028	9
City Of Moore WWTP	Moore	4.94	9	OK0027391	Effective	Dec 2028	3
Lynn Lane Waste Water Treatment Plant	Broken Arrow	4.64	8	OK0040053	Effective	Apr 2030	53
Ponca City, City Of	Ponca City	3.54	6.5	OK0026069	Effective	Mar 2031	0
City Of Ardmore Wastewater Treatment Plant	Ardmore	2.42	5.9	OK0038440	Effective	Apr 2029	160
Tahlequah Pwa	Tahlequah	2.58	5.27	OK0026964	Administratively continued	Jun 2010	227
Chickasha WWTP	Chickasha	1.36	4.5	OK0026018	Effective	Dec 2026	4
Duncan Public Utilities Auth	Duncan	1.75	4.5	OK0026638	Effective	Jul 2028	380
Owasso Public Works Authority	Owasso	2.51	4.2	OK0020303	Effective	Jul 2028	4
Tulsa MUA-Lower Bird Ck Plant	Catoosa	0.93	4	OK0042935	Effective	Jul 2029	0
Oowa / Tsc	Pryor	3.97	—	OK0034568	Effective	Aug 2029	1
Clinton, City Of	Clinton	0.71	3.8	OK0031011	Effective	Jan 2028	120

All 231 plants in Oklahoma →

NPDES permits 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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