Oxidation ditches: wastewater treatment plants in Louisiana
25 plants · 9% of the state · 50 MGD reported by 23 plants
Klarifi identifies 25 publicly owned wastewater treatment plants with oxidation ditches in Louisiana, 9% of the 277 plants in the state (50 MGD reported by 23 plants). The largest is Hammond North STP in Hammond at 7.21 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 | Hammond North STP | Hammond | 7.21 | LA0032328 | Aug 2028 | 37 |
| 2 | Plant B | Lake Charles | 6.53 | LAL036366 | Dec 2030 | 73 |
| 3 | Lafayette Consolidated Government - Ambassador Caffery STP | Lafayette | 5.29 | LA0042561 | Sep 2031 | 0 |
| 4 | Red River Wastewater Treatment Plant | Bossier City | 4.62 | LA0053716 | May 2028 | 0 |
| 5 | Shreveport North Regional WWTP | Shreveport | 3.78 | LAL042188 | Dec 2030 | 42 |
| 6 | Northeast Wastewater Treatment Plant | Bossier City | 3.57 | LA0065978 | Mar 2026 | 0 |
| 7 | Ruston, City Of- Northside Wastewater Treatment Plant | Ruston | 3.31 | LA0036323 | Jun 2028 | 68 |
| 8 | Denham Springs Wastewater Treatment Facility | Denham Springs | 2.67 | LAL045730 | Dec 2030 | 193 |
| 9 | Lafayette Consolidated Government - East WWTP | Lafayette | 2.58 | LAL036382 | Dec 2030 | 1 |
| 10 | Abbeville Wastewater Treatment Facility | Abbeville | 2.33 | LAL039748 | Dec 2030 | 1 |
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 October 26, 2026.
Wastewater terms: Oxidation ditch · Activated sludge · Biological nutrient removal · Significant industrial user · WWTP · all terms