Oklahoma wastewater permits expiring in 2026
31 NPDES permits · 7 MGD combined average flow
31 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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Mcalester, City Of - West Plant | Mcalester | 1.45 | OK0026093 | May 2026 | 96 |
| Krebs Utilities Authority | Krebs | 0.26 | OK0030686 | Jun 2026 | 6 |
| Coalgate Pwa | Coalgate | 0.4 | OKG580028 | Jul 2026 | 73 |
| Wynnewood Water & Light | Wynnewood | 0.26 | OK0028282 | Jul 2026 | 21 |
| Colbert Wwt | Colbert | 0.16 | OKG580017 | Jul 2026 | 122 |
| Gans, Town Of | Gans | 0.13 | OKG580068 | Jul 2026 | 127 |
| Lindsay, City Of | Lindsay | 0.1 | OKG580021 | Jul 2026 | 64 |
| Ok St Dept Of Corrections-Howa | Atoka | 0.09 | OKG580069 | Jul 2026 | 73 |
| Verden, Town Of | Verden | 0.07 | OKG580049 | Jul 2026 | 2 |
| Tuttle, City Of | Tuttle | 0.05 | OKG580054 | Jul 2026 | 53 |
| Leflore County Rw & Sd #5 | Leflore | 0.03 | OKG580052 | Jul 2026 | 4 |
| Shady Point Pwa | Shady Point | 0.03 | OKG580051 | Jul 2026 | 14 |
| Cameron Pwa | Cameron | 0.03 | OKG580074 | Jul 2026 | 2 |
| Whitefield Mia | Whitefield | 0.01 | OKG580050 | Jul 2026 | 20 |
| Mill Creek, Town Of | Mill Creek | 0.01 | OKG580014 | Jul 2026 | 43 |
| Wilson Pwa | Wilson | 0.0073 | OKG580013 | Jul 2026 | 78 |
| Okay Pwa | Okay | 0.000065 | OKG580020 | Jul 2026 | 107 |
| North Enid, Town Of | North Enid | — | OKG580002 | Jul 2026 | 1 |
| Stuart Pwa | Stuart | — | OKG580022 | Jul 2026 | 0 |
| Tryon Utility Authority | Tryon | — | OKG580029 | Jul 2026 | 190 |
| Valliant Pwa | Valliant | — | OKG580065 | Jul 2026 | 30 |
| Heavener Utility Authority | Heavener | 0.51 | OK0038407 | Aug 2026 | 3 |
| Dewar WWTF | Dewar | 0.05 | OK0027537 | Sep 2026 | 29 |
| Pittsburg Co. Rwd #14 | Pittsburg | 0.0017 | OK0027782 | Sep 2026 | 24 |
| Crowder Pwa Wwt | Crowder | 0.05 | OK0035301 | Oct 2026 | 30 |
| Candian Public Works Auth | Canadian | 0.02 | OK0035297 | Oct 2026 | 36 |
| Holdenville Pwa | Holdenville | 0.6 | OK0028428 | Nov 2026 | 311 |
| Stroud Ua-North Plant | Stroud | 0.16 | OK0027367 | Nov 2026 | 5 |
| Wister, City Of | Wister | 0.04 | OK0034118 | Nov 2026 | 4 |
| Chickasha WWTP | Chickasha | 1.41 | OK0026018 | Dec 2026 | 6 |
| Mcalester East WWTP | Mcalester | 1.03 | OK0026107 | Dec 2026 | 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 October 26, 2026.
Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Activated sludge · Oxidation ditch · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “NPDES permits expiring in 2026: Oklahoma wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/oklahoma/permits-expiring/2026Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.