Anaerobic digesters and biogas: wastewater treatment plants in Louisiana
12 plants · 5% of the state · 100 MGD reported by 11 plants
Klarifi identifies 12 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Louisiana, 5% of the 259 plants in the state (100 MGD reported by 11 plants). The largest is South Wastewater Treatment Plant in Baton Rouge at 33 MGD.
Anaerobic digesters stabilise sludge in sealed heated tanks and produce biogas, visible from the air as digester silos and gas holders. Plants with digesters are typically above 5 MGD and are the buyers of mixing, heating, gas handling, cogeneration and dewatering equipment.
The largest plants with anaerobic digesters in Louisiana
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | South Wastewater Treatment Plant | Baton Rouge | 33 | LA0036412 | Jun 2029 | 20 |
| 2 | Jefferson Parish Department Of Sewerage- East Bank WWTP | Elmwood | 20.66 | LA0066630 | Jul 2028 | 0 |
| 3 | Baton Rouge, City Of | Scotlandville | 11 | LA0036439 | Jul 2029 | 30 |
| 4 | Sewerage & Water Board Of New Orleans Westb Ank Sewage | New Orleans | 10.13 | LA0038105 | Nov 2029 | 1 |
| 5 | Jefferson Parish Department Of Sewerage- Marrero WWTP | Marrero | 6.19 | LA0042048 | Oct 2026 | 5 |
| 6 | Monroe, City Of (wpc Cntr) | Monroe | 6.09 | LAL038741 | Dec 2030 | 78 |
| 7 | Lafayette Consolidated Government - Ambassador Caffery STP | Lafayette | 4.38 | LA0042561 | Oct 2024 | 0 |
| 8 | Carrollton Water Purification Plant | New Orleans | 3.38 | LA0000086 | Jun 2025 | 53 |
| 9 | Lafayette Consolidated Government - East WWTP | Lafayette | 2.36 | LAL036382 | Dec 2030 | 1 |
| 10 | Thibodaux, City Of- Wastewater Treatment Facility | Thibodaux | 2.1 | LA0032948 | Jul 2029 | 77 |
| 11 | Plaquemines Parish Government- Buras WWTP | Buras | 0.35 | LAL044041 | Dec 2030 | 0 |
| 12 | Jefferson Parish Dept Of Sewerage - Harv | Harvey | — | AR0000868 | Oct 2025 | 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 Louisiana
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas 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.