Anaerobic digesters and biogas: wastewater treatment plants in Idaho
7 plants · 7% of the state · 79 MGD combined
Klarifi identifies 7 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Idaho, 7% of the 94 plants in the state (79 MGD combined). The largest is West Boise WWTP in Garden City at 50.91 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 Idaho
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | West Boise WWTP | Garden City | 50.91 | ID0023981 | Jun 2027 | 10 |
| 2 | Nampa WWTP | Nampa | 10.69 | ID0022063 | Oct 2021 | 27 |
| 3 | Pocatello City WWTP | Pocatello | 6.38 | ID0021784 | Aug 2017 | 8 |
| 4 | Lewiston WWTP | Lewiston | 3.36 | ID0022055 | Jan 2021 | 0 |
| 5 | Jerome WWTP | Jerome | 3.33 | ID0020168 | Jun 2015 | 4 |
| 6 | Rexburg WWTP | Rexburg | 3.22 | ID0023817 | Mar 2028 | 41 |
| 7 | Ketchum Sun Valley WWTP | Ketchum | 1.14 | ID0020281 | Jul 2017 | 0 |
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 Idaho
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Idaho: 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