Anaerobic digesters and biogas: wastewater treatment plants in Arizona
15 plants · 27% of the state · 165 MGD reported by 11 plants
Klarifi identifies 15 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Arizona, 27% of the 56 plants in the state (165 MGD reported by 11 plants). The largest is 91st Avenue WWTP in Tolleson at 83.69 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 Arizona
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | 91st Avenue WWTP | Tolleson | 83.69 | AZ0020524 | Apr 2028 | 2 |
| 2 | 23rd Avenue Wastewater Treatment Plant | Phoenix | 35.19 | AZ0020559 | Jun 2029 | 2 |
| 3 | Pima County - Ina Road WWTP | Tucson | 29.75 | AZ0020001 | May 2027 | 3 |
| 4 | Yuma, City Of - Figueroa Ave WPCF | Yuma | 7.28 | AZ0020443 | Aug 2028 | 13 |
| 5 | Northwest Water Reclamation Plant | Mesa | 3.08 | AZ0024627 | Jun 2024 | 0 |
| 6 | Town Of Prescott Valley - WWTP | Prescott Valley | 2.69 | AZ0025381 | Feb 2027 | 0 |
| 7 | Tolleson WWTP | Tolleson | 2.1 | AZ0020338 | Feb 2031 | 28 |
| 8 | City Of Mesa - Greenfield Water Reclamation Plant | Gilbert | 1.08 | AZ0025241 | Sep 2029 | 0 |
| 9 | City Of Peoria | Peoria | 0.43 | AZ0024945 | Jul 2027 | 17 |
| 10 | Town Of Kearny Wastewater Reclamation Facility | Kearny | 0.09 | AZ0024449 | Jul 2026 | 46 |
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 Arizona
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Arizona: 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