Anaerobic digesters and biogas: wastewater treatment plants in Colorado
16 plants · 12% of the state · 42 MGD reported by 15 plants
Klarifi identifies 16 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Colorado, 12% of the 139 plants in the state (42 MGD reported by 15 plants). The largest is Persigo Wastewater Treatment Plant in Grand Junction at 10.37 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 Colorado
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Persigo Wastewater Treatment Plant | Grand Junction | 10.37 | CO0040053 | Dec 2022 | 1 |
| 2 | Greeley WWTP | Greeley | 8.34 | COL040258 | Dec 2030 | 13 |
| 3 | Big Dry Creek WWTP | Westminster | 6.94 | COR901608 | Jun 2029 | 388 |
| 4 | Parker Water + Sanitation District - North Water Reclamation Facility | Parker | 4.83 | COG072642 | Aug 2018 | 80 |
| 5 | South Ft. Collins Sanit. Dist. | Fort Collins | 3.52 | CO0020737 | Jan 2018 | 1 |
| 6 | Steamboat Springs WWTP | Steamboat Springs | 3.46 | CO0020834 | Dec 2021 | 34 |
| 7 | Lafayette WWTF | Lafayette | 2.39 | COR900828 | Jun 2029 | 0 |
| 8 | City Of Salida WWTP | Salida | 0.69 | CO0040339 | Nov 2024 | 0 |
| 9 | Buena Vista Sanitation District WWTF | Buena Vista | 0.5 | CO0045748 | Oct 2020 | 1 |
| 10 | Black Hawk/central City Sd WWTF | Black Hawk | 0.47 | CO0046761 | Jun 2017 | 4 |
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 Colorado
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Colorado: 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 · Lift station · Inflow and infiltration · all terms