Activated sludge and clarifiers: wastewater treatment plants in Oklahoma
79 plants · 34% of the state · 151 MGD reported by 76 plants
Klarifi identifies 79 publicly owned wastewater treatment plants with activated sludge and clarifiers in Oklahoma, 34% of the 231 plants in the state (151 MGD reported by 76 plants). The largest is Northside Wastewater Treatment Plant in Tulsa at 17.9 MGD.
Activated sludge is the standard mechanical process for cities: aeration basins where bacteria consume organic matter, followed by clarifiers that settle the biomass out. These plants are identified by their circular or rectangular clarifiers and by the suspended-growth process code, and they are the main market for blowers, diffusers, clarifier mechanisms and instrumentation.
The largest activated sludge plants in Oklahoma
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Northside Wastewater Treatment Plant | Tulsa | 17.9 | OK0026221 | Feb 2028 | 19 |
| 2 | Ok City Water Util Trst-Deer Ck | Oklahoma City | 14.07 | OK0027561 | Aug 2029 | 39 |
| 3 | Haikey Creek Wastewater Treatment Plant | Broken Arrow | 11.94 | OK0034363 | Apr 2030 | 3 |
| 4 | Lawton, City Of | Lawton | 11 | OK0035246 | Sep 2030 | 182 |
| 5 | Norman (main) Wwt | Norman | 10.7 | OK0029190 | Oct 2030 | 61 |
| 6 | Edmond, City Of - Coffee Creek | Edmond | 6.9 | OK0026026 | Oct 2030 | 20 |
| 7 | Ok City Water Util Trst-Chisholm | Edmond | 5.61 | OK0027553 | Aug 2029 | 21 |
| 8 | Midwest City Wwt | Oklahoma City | 4.95 | OK0026841 | Apr 2020 | 42 |
| 9 | Stillwater, City Of | Stillwater | 4.65 | OK0027057 | Mar 2028 | 9 |
| 10 | Enid, City Of | Enid | 4.56 | OK0021628 | Jul 2029 | 7 |
| 11 | Oowa / Tsc | Pryor | 3.97 | OK0034568 | Aug 2029 | 1 |
| 12 | City Of Muskogee Pollution Control Plant | Muskogee | 3.9 | OK0029131 | Dec 2030 | 41 |
| 13 | Ponca City, City Of | Ponca City | 3.54 | OK0026069 | Mar 2031 | 0 |
| 14 | Yukon, City Of | Yukon | 3.06 | OK0028584 | Sep 2029 | 43 |
| 15 | Tahlequah Pwa | Tahlequah | 2.58 | OK0026964 | Jun 2010 | 227 |
| 16 | Owasso Public Works Authority | Owasso | 2.51 | OK0020303 | Jul 2028 | 4 |
| 17 | Okmulgee WWTP | Okmulgee | 2.48 | OK0028134 | May 2022 | 93 |
| 18 | City Of Ardmore Wastewater Treatment Plant | Ardmore | 2.42 | OK0038440 | Apr 2029 | 160 |
| 19 | Altus SE Wastewater Treatment Plant | Altus | 2.35 | OK0028037 | Apr 2030 | 150 |
| 20 | Durant City Utilities Auth | Durant | 2.1 | OK0039063 | May 2030 | 197 |
| 21 | Jenks Wastewater Treat. Plant | Jenks | 1.92 | OK0037401 | Aug 2030 | 18 |
| 22 | Duncan Public Utilities Auth | Duncan | 1.75 | OK0026638 | Jul 2028 | 380 |
| 23 | Sand Springs Main WWTP | Sand Springs | 1.59 | OK0030864 | Feb 2031 | 40 |
| 24 | Foss Reservoir M.C.D. | Foss | 1.5 | OK0041491 | May 2012 | 0 |
| 25 | Mcalester, City Of - West Plant | Mcalester | 1.46 | OK0026093 | May 2026 | 96 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Oklahoma
Activated sludge and clarifiers in other states
Activated sludge and clarifiers 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.