Anaerobic digesters and biogas: wastewater treatment plants in Minnesota
108 plants · 23% of the state · 280 MGD reported by 98 plants
Klarifi identifies 108 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Minnesota, 23% of the 470 plants in the state (280 MGD reported by 98 plants). The largest is Met Council Metropolitan WWTP in Saint Paul at 164.27 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 Minnesota
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Met Council Metropolitan WWTP | Saint Paul | 164.27 | MNL029815 | Dec 2030 | 0 |
| 2 | Blue Lake Wastewater Treatment Plant | Shakopee | 25.9 | MN0029882 | Sep 2029 | 0 |
| 3 | Met Council - Empire WWTP | Farmington | 11.65 | MNL045845 | Dec 2030 | 0 |
| 4 | Rochester Water Reclamation Plant | Rochester | 11.39 | MN0024619 | Mar 2027 | 1 |
| 5 | Saint Cloud WWTP | St. Cloud | 9.41 | MNL040878 | Dec 2030 | 0 |
| 6 | Moorhead Wastewater Treatment Facility | Moorhead | 3.8 | MN0049069 | Jun 2026 | 0 |
| 7 | Owatonna WWTP | Owatonna | 3.32 | MN0051284 | May 2026 | 10 |
| 8 | Alexandria Lake Area Sanitary District | Alexandria | 2.75 | MN0040738 | Jul 2030 | 0 |
| 9 | Met Council - St Croix Valley WWTP | Oak Park Heights | 2.44 | MN0029998 | May 2027 | 0 |
| 10 | Whitewater River Regional WWTP | Saint Charles | 2.35 | MN0046868 | Oct 2027 | 13 |
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 Minnesota
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Minnesota: 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 · Equalization tank · Ozonation · all terms