Anaerobic digesters and biogas: wastewater treatment plants in Ohio
115 plants · 14% of the state · 586 MGD reported by 114 plants
Klarifi identifies 115 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Ohio, 14% of the 837 plants in the state (586 MGD reported by 114 plants). The largest is Southerly Wastewater Treatment Plant in Lockbourne at 82.1 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 | 82.1 | OHL024741 | Dec 2030 | 7 |
| 2 | Southerly Wastewater Treatment Center | Cleveland | 78.11 | OHL024651 | Dec 2030 | 3 |
| 3 | City Of Toledo Division Of Water Reclaimation | Toledo | 39.6 | OH0027740 | Jan 2029 | 3 |
| 4 | City Of Dayton Water Reclamation Facility (0857100983) | Dayton | 38.22 | OH0024881 | Apr 2027 | 17 |
| 5 | Metropolitan Sewer Dis Little Miami WWTP | Cincinnati | 21.87 | OH0025453 | Jun 2030 | 8 |
| 6 | Waste Water Treatment Plant | Youngstown | 20.84 | OH0028223 | Oct 2028 | 231 |
| 7 | Neorsd Westerly Wwt Complex | Cleveland | 18.52 | OH0024660 | Jun 2030 | 0 |
| 8 | City Of Springfield Wastewater Treatment | Springfield | 12.27 | OH0027481 | Feb 2030 | 39 |
| 9 | Middletown Wastewater Treatment Plant | Middletown | 11.69 | OH0026522 | Dec 2026 | 82 |
| 10 | Maumee River Wastewater Treatment Plant | Waterville | 11.65 | OH0034223 | Dec 2027 | 15 |
| 11 | Lakewood WWTP | Lakewood | 11.52 | OH0026018 | Jul 2026 | 5 |
| 12 | Gary L Kron Water Reclamation Facility | Mentor | 9.35 | OH0043559 | Mar 2027 | 29 |
| 13 | Massillon WWTP | Massillon | 8.87 | OH0020516 | May 2031 | 0 |
| 14 | Upper Mill Creek Water Reclamation Facil | West Chester | 8.34 | OH0072087 | Dec 2023 | 33 |
| 15 | Rocky River Wastewater Treatment Plant | Rocky River | 8.3 | OH0030503 | Jan 2028 | 15 |
| 16 | Muddy Creek WWTP | Cincinnati | 7.73 | OH0025470 | Mar 2030 | 18 |
| 17 | Black River Wastewater Treatment Plant | Lorain | 7.69 | OH0026093 | Nov 2027 | 6 |
| 18 | Sandusky WPC | Sandusky | 7.47 | OH0027332 | Apr 2031 | 0 |
| 19 | North Regional Wastewater Treatment Plan (0857143037) | Dayton | 7.07 | OH0049646 | Feb 2027 | 47 |
| 20 | Mansfield Wastewater Treatment Plant | Mansfield | 6.67 | OH0026328 | Mar 2030 | 428 |
| 21 | Newark WWTP | Newark | 6.66 | OH0026671 | Jun 2031 | 594 |
| 22 | City Of Zanesville Wastewater Treatment Plant | Zanesville | 5.91 | OH0028240 | Mar 2028 | 12 |
| 23 | Medina County - Liverpool WWTP (sd #500) | Valley City | 5.85 | OH0043567 | Nov 2030 | 6 |
| 24 | City Of Elyria Wastewater Pollution Control Plant | Elyria | 5.49 | OH0025003 | May 2026 | 1 |
| 25 | Hamilton Water Reclamation Facility | Hamilton | 5.26 | OH0025445 | Oct 2026 | 7 |
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 September 11, 2026.