Anaerobic digesters and biogas: wastewater treatment plants in Ohio
112 plants · 13% of the state · 796 MGD combined
Klarifi identifies 112 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Ohio, 13% of the 843 plants in the state (796 MGD combined). The largest is Southerly Wastewater Treatment Plant in Lockbourne at 112.28 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 Ohio
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Southerly Wastewater Treatment Plant | Lockbourne | 112.28 | OHL024741 | Dec 2030 | 9 |
| 2 | Southerly Wastewater Treatment Center | Cleveland | 110.09 | OHL024651 | Dec 2030 | 4 |
| 3 | City Of Dayton Water Reclamation Facility (0857100983) | Dayton | 51.69 | OH0024881 | Apr 2027 | 17 |
| 4 | Metropolitan Sewer Dis Little Miami WWTP | Cincinnati | 44.32 | OH0025453 | Jun 2030 | 8 |
| 5 | Waste Water Treatment Plant | Youngstown | 33.2 | OH0028223 | Oct 2028 | 231 |
| 6 | Neorsd Westerly Wwt Complex | Cleveland | 27.54 | OH0024660 | Jun 2030 | 0 |
| 7 | Middletown Wastewater Treatment Plant | Middletown | 21.19 | OH0026522 | Dec 2026 | 85 |
| 8 | City Of Springfield Wastewater Treatment | Springfield | 17.12 | OH0027481 | Feb 2030 | 39 |
| 9 | Maumee River Wastewater Treatment Plant | Waterville | 15.06 | OH0034223 | Dec 2027 | 15 |
| 10 | Gary L Kron Water Reclamation Facility | Mentor | 14.71 | OH0043559 | Mar 2027 | 30 |
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 Ohio
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Ohio: 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 · WWTP · Filter press · all terms