Oxidation ditches: wastewater treatment plants in Louisiana
25 plants · 10% of the state · 42 MGD reported by 23 plants
Klarifi identifies 25 publicly owned wastewater treatment plants with oxidation ditches in Louisiana, 10% of the 259 plants in the state (42 MGD reported by 23 plants). The largest is Plant B in Lake Charles at 5.74 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 Louisiana
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Plant B | Lake Charles | 5.74 | LAL036366 | Dec 2030 | 73 |
| 2 | Hammond North STP | Hammond | 4.87 | LA0032328 | Aug 2028 | 36 |
| 3 | Red River Wastewater Treatment Plant | Bossier City | 4.48 | LA0053716 | May 2028 | 0 |
| 4 | Lafayette Consolidated Government - Ambassador Caffery STP | Lafayette | 4.38 | LA0042561 | Oct 2024 | 0 |
| 5 | Northeast Wastewater Treatment Plant | Bossier City | 3.76 | LA0065978 | Mar 2026 | 0 |
| 6 | Ruston, City Of- Northside Wastewater Treatment Plant | Ruston | 3.22 | LA0036323 | Jun 2028 | 81 |
| 7 | Shreveport North Regional WWTP | Shreveport | 2.71 | LAL042188 | Dec 2030 | 42 |
| 8 | Denham Springs Wastewater Treatment Facility | Denham Springs | 2.39 | LAL045730 | Dec 2030 | 207 |
| 9 | Lafayette Consolidated Government - East WWTP | Lafayette | 2.36 | LAL036382 | Dec 2030 | 1 |
| 10 | Abbeville Wastewater Treatment Facility | Abbeville | 1.9 | LAL039748 | Dec 2030 | 1 |
| 11 | Lafayette Consolidated Government - Northeast WWTP | Lafayette | 1.16 | LAL036391 | Dec 2030 | 0 |
| 12 | Natchitoches, City Of | Natchitoches | 1.13 | LAL095222 | Dec 2030 | 23 |
| 13 | Delhi, Town Of - WWTP | Delhi | 1.1 | LA0039802 | Nov 2027 | 104 |
| 14 | Leesville, City Of | Leesville | 0.81 | LA0043575 | Aug 2028 | 124 |
| 15 | Ville Platte, City Of | Ville Platte | 0.64 | LA0038814 | Mar 2027 | 181 |
| 16 | Winnfield, City Of- Wastewater Treatment Plant | Winnfield | 0.44 | LA0043915 | Oct 2024 | 72 |
| 17 | Homer WWTP | Homer | 0.3 | LA0038521 | Oct 2025 | 145 |
| 18 | Jeanerette, City Of | Jeanerette | 0.26 | LA0040193 | Oct 2025 | 97 |
| 19 | Colfax Wastewater Treatment Facility | Colfax | 0.21 | LA0033456 | Jul 2026 | 59 |
| 20 | Winnsboro, Town Of Winnsboro | Winnsboro | 0.17 | LA0020281 | Sep 2028 | 102 |
| 21 | Bernice, Town Of | Bernice | 0.11 | LA0034568 | Aug 2031 | 12 |
| 22 | Glenmora, Town Of Water Sys | Glenmora | 0.07 | LA0054925 | May 2028 | 3 |
| 23 | Pleasant Hill, Village Of- Wastewater Treatment Facility | Pleasant Hill | 0.04 | LA0038946 | Feb 2028 | 298 |
| 24 | Addis Wastewater Treatment Plant | Addis | — | LA0089257 | Oct 2026 | 31 |
| 25 | South Lake D'Arbonne WW Package Treatment Plant Addision | Farmerville | — | LAG570510 | Jul 2029 | 4 |
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 Louisiana
Oxidation ditches in other states
Oxidation ditches in Louisiana: 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.