Oxidation ditches: wastewater treatment plants in Texas
261 plants · 21% of the state · 415 MGD reported by 249 plants
Klarifi identifies 261 publicly owned wastewater treatment plants with oxidation ditches in Texas, 21% of the 1,220 plants in the state (415 MGD reported by 249 plants). The largest is Wilson Creek Regional Wastewater Treatment Plant in Mc Kinney at 70.77 MGD.
Oxidation ditches are ring-shaped activated sludge reactors with long retention times, common at plants between 0.5 and 10 MGD. They are recognisable from the air by their looped channels and rely on surface aerators or brush rotors, which are frequent replacement and energy-efficiency projects.
The largest oxidation ditch plants in Texas
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Wilson Creek Regional Wastewater Treatment Plant | Mc Kinney | 70.77 | TX0047911 | Oct 2027 | 24 |
| 2 | New Vince Bayou WWTF | Pasadena | 25 | TX0117528 | Jul 2026 | 139 |
| 3 | South Laredo WWTP | Laredo | 16.98 | TX0085316 | Jun 2031 | 2 |
| 4 | Bell County Wcid #1 Wastewater Treatment Facility | Killeen | 14.67 | TX0102938 | Feb 2030 | 36 |
| 5 | City Of Tyler- Westside Wastewater Treatment Plant | Tyler | 10.19 | TX0047996 | Feb 2025 | 35 |
| 6 | Galveston County Wcid 1 WWTP | Dickinson | 9.8 | TX0023655 | Apr 2029 | 1 |
| 7 | South Mission 1 WWTP | Mission | 9.49 | TX0070017 | Apr 2028 | 0 |
| 8 | Temple Belton WWTP | Belton | 9.2 | TX0058378 | Jul 2030 | 25 |
| 9 | Medio Creek Water Recyc. Ctr. | San Antonio | 8.96 | TX0055689 | May 2028 | 2 |
| 10 | Bob Derrington Water Reclamation Plant | Odessa | 8.79 | TX0072800 | Jul 2025 | 92 |
| 11 | Sugar Land South WWTP | Sugar Land | 8.37 | TX0096881 | Jan 2030 | 10 |
| 12 | City Of Tyler - Southside Wastewater Treatment Plant | Tyler | 8.36 | TXR05X204 | Aug 2026 | 94 |
| 13 | City Of Pharr WWTP | Pharr | 7.6 | TX0062219 | Aug 2029 | 63 |
| 14 | STP 2a WWTP | Nacogdoches | 6.2 | TX0055123 | Apr 2030 | 7 |
| 15 | San Marcos WWTP | San Marcos | 6.1 | TX0047945 | Jan 2030 | 87 |
| 16 | Salatrillo Creek WWTP | Converse | 5.81 | TX0053074 | Jan 2031 | 5 |
| 17 | City Of Pflugerville | Pflugerville | 4.95 | TX0094927 | Nov 2025 | 42 |
| 18 | Little Cedar Bayou Wastewater Treatment Facility | La Porte | 4.32 | TX0022799 | Apr 2030 | 7 |
| 19 | Steep Bank/flat Bank WWTP | Missouri City | 4.13 | TX0114855 | Feb 2030 | 68 |
| 20 | City Of Pearland Barry Rose W. W. Treatment Plant | Pearland | 3.89 | TX0032735 | Apr 2030 | 28 |
| 21 | Mustang Creek WWTP | Taylor | 3.5 | TX0020443 | Jul 2029 | 13 |
| 22 | Double Creek Wastewater Treatment Plant | Jacksonville | 3.48 | TX0100587 | Feb 2027 | 21 |
| 23 | City Of Mercedes WWTP | Mercedes | 3.23 | TX0021547 | Feb 2027 | 2 |
| 24 | Doshier Farm Wastewater Treatment Plant | Temple | 3.19 | TX0047651 | Sep 2030 | 22 |
| 25 | City Of San Juan WWTP | San Juan | 3.12 | TX0057592 | Mar 2026 | 0 |
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 Texas
Oxidation ditches in other states
Oxidation ditches in Texas: 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.