Lagoon systems: wastewater treatment plants in Oklahoma
197 plants · 85% of the state · 186 MGD reported by 153 plants
Klarifi identifies 197 publicly owned wastewater treatment plants with lagoon systems in Oklahoma, 85% of the 231 plants in the state (186 MGD reported by 153 plants). The largest is Tmua South in Tulsa at 18.57 MGD.
Lagoon systems treat wastewater in large earthen ponds over weeks of retention time, with or without mechanical aeration. They serve thousands of small towns because they are cheap to run, but they struggle with ammonia and nutrient limits, fill with sludge over decades and are the plants most often converted or upgraded when a permit is renewed.
The largest lagoons in Oklahoma
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Tmua South | Tulsa | 18.57 | OK0026239 | May 2029 | 21 |
| 2 | Northside Wastewater Treatment Plant | Tulsa | 17.9 | OK0026221 | Feb 2028 | 19 |
| 3 | Ok City Water Util Trst-Deer Ck | Oklahoma City | 14.07 | OK0027561 | Aug 2029 | 39 |
| 4 | Haikey Creek Wastewater Treatment Plant | Broken Arrow | 11.94 | OK0034363 | Apr 2030 | 3 |
| 5 | Lawton, City Of | Lawton | 11 | OK0035246 | Sep 2030 | 182 |
| 6 | Norman (main) Wwt | Norman | 10.7 | OK0029190 | Oct 2030 | 61 |
| 7 | Edmond, City Of - Coffee Creek | Edmond | 6.9 | OK0026026 | Oct 2030 | 20 |
| 8 | Ok City Water Util Trst-Chisholm | Edmond | 5.61 | OK0027553 | Aug 2029 | 21 |
| 9 | Midwest City Wwt | Oklahoma City | 4.95 | OK0026841 | Apr 2020 | 42 |
| 10 | Stillwater, City Of | Stillwater | 4.65 | OK0027057 | Mar 2028 | 9 |
| 11 | Lynn Lane Waste Water Treatment Plant | Broken Arrow | 4.64 | OK0040053 | Apr 2030 | 53 |
| 12 | Oowa / Tsc | Pryor | 3.97 | OK0034568 | Aug 2029 | 1 |
| 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 | Bixby Pulbic Works Auth -South | Bixby | 2.62 | OK0026913 | Feb 2029 | 50 |
| 16 | Tahlequah Pwa | Tahlequah | 2.58 | OK0026964 | Jun 2010 | 227 |
| 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 | Sapulpa WWTF | Sapulpa | 2.1 | OK0043974 | Aug 2030 | 77 |
| 21 | Durant City Utilities Auth | Durant | 2.1 | OK0039063 | May 2030 | 197 |
| 22 | Duncan Public Utilities Auth | Duncan | 1.75 | OK0026638 | Jul 2028 | 380 |
| 23 | Ada, City Of | Ada | 1.75 | OK0026115 | Feb 2028 | 3 |
| 24 | Mustang Improvement Authority | Mustang | 1.66 | OK0026816 | Nov 2028 | 96 |
| 25 | Sand Springs Main WWTP | Sand Springs | 1.59 | OK0030864 | Feb 2031 | 40 |
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
Lagoon systems in other states
Lagoon systems 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.