Anaerobic digesters and biogas: wastewater treatment plants in Minnesota
106 plants · 23% of the state · 289 MGD reported by 95 plants
Klarifi identifies 106 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Minnesota, 23% of the 460 plants in the state (289 MGD reported by 95 plants). The largest is Met Council Metropolitan WWTP in Saint Paul at 180 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 | 180 | MNL029815 | Dec 2030 | 0 |
| 2 | Blue Lake Wastewater Treatment Plant | Shakopee | 26.54 | MN0029882 | Sep 2029 | 0 |
| 3 | Met Council - Empire WWTP | Farmington | 12.05 | MNL045845 | Dec 2030 | 0 |
| 4 | Rochester Water Reclamation Plant | Rochester | 11.33 | MN0024619 | Mar 2027 | 1 |
| 5 | Moorhead Wastewater Treatment Facility | Moorhead | 3.82 | MN0049069 | Jun 2026 | 0 |
| 6 | Owatonna WWTP | Owatonna | 3.16 | MN0051284 | May 2026 | 9 |
| 7 | Albert Lea Wastewater Treatment Facility | Albert Lea | 3.06 | MN0041092 | Jan 2027 | 1 |
| 8 | Alexandria Lake Area Sanitary District | Alexandria | 2.95 | MN0040738 | Jul 2030 | 0 |
| 9 | Met Council - St Croix Valley WWTP | Oak Park Heights | 2.54 | MN0029998 | May 2027 | 0 |
| 10 | Marshall WWTP | Marshall | 2.51 | MN0022179 | Feb 2029 | 16 |
| 11 | Litchfield WWTP | Litchfield | 2 | MN0023973 | Dec 2030 | 22 |
| 12 | Red Wing WWTP | Red Wing | 1.66 | MNL024571 | Dec 2030 | 0 |
| 13 | Elk River WWTP | Elk River | 1.6 | MNL020788 | Dec 2030 | 1 |
| 14 | Long Prairie WWTP | Long Prairie | 1.51 | MN0066079 | Apr 2023 | 2 |
| 15 | Fergus Falls WWTP | Fergus Falls | 1.44 | MN0050628 | Aug 2028 | 2 |
| 16 | Montevideo WWTP | Montevideo | 1.35 | MN0020133 | Apr 2019 | 27 |
| 17 | Buffalo WWTP | Buffalo | 1.23 | MNL040649 | Dec 2030 | 1 |
| 18 | Cold Spring WWTP | Cold Spring | 1.16 | MNL023094 | Dec 2030 | 0 |
| 19 | Rogers WWTP | Rogers | 1.09 | MN0029629 | Mar 2026 | 5 |
| 20 | Bemidji WWTP | Bemidji | 1.09 | MN0022462 | Mar 2026 | 0 |
| 21 | Monticello WWTP | Monticello | 1.05 | MN0020567 | Jul 2031 | 106 |
| 22 | Saint Michael WWTP | Saint Michael | 0.96 | MN0020222 | Nov 2030 | 24 |
| 23 | Virginia WWTP | Virginia | 0.94 | MN0030163 | Mar 2026 | 1 |
| 24 | Becker WWTP | Becker | 0.91 | MN0025666 | Sep 2029 | 10 |
| 25 | Redwood Falls WWTP | Redwood Falls | 0.89 | MN0020401 | Dec 2027 | 26 |
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 September 11, 2026.