Anaerobic digesters and biogas: wastewater treatment plants in Indiana
55 plants · 13% of the state · 405 MGD reported by 53 plants
Klarifi identifies 55 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Indiana, 13% of the 434 plants in the state (405 MGD reported by 53 plants). The largest is Indianapolis Belmont WWTP in Indianapolis at 105.33 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 Indiana
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Indianapolis Belmont WWTP | Indianapolis | 105.33 | IN0023183 | May 2029 | 117 |
| 2 | Water Pollution Control Plant | Fort Wayne | 44.71 | IN0032191 | Sep 2031 | 2 |
| 3 | Gary Sanitary District | Gary | 42.04 | IN0022977 | Jun 2027 | 23 |
| 4 | Saniatry District Of Hammond | Hammond | 34.49 | IN0023060 | Apr 2027 | 21 |
| 5 | Lafayette WWTP | Lafayette | 18 | IN0032468 | Jul 2028 | 0 |
| 6 | Muncie Water Pollution Control Facility | Muncie | 17.5 | IN0025631 | Jun 2029 | 0 |
| 7 | Mishawaka Wastewater Treatment Plant | Mishawaka | 12.29 | IN0025640 | Apr 2027 | 2 |
| 8 | Evansville Westside WWTP | Evansville | 11.68 | IN0032956 | Jan 2027 | 6 |
| 9 | Anderson WWTP | Anderson | 10.46 | IN0032476 | Sep 2030 | 9 |
| 10 | West Lafayette WWTP | West Lafayette | 8.01 | IN0024821 | Jan 2031 | 11 |
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 Indiana
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Indiana: 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: Anaerobic digester · Biosolids · Sludge dewatering · Centrate · Filter press · FOG · all terms