Anaerobic digesters and biogas: wastewater treatment plants in Arkansas
13 plants · 4% of the state · 53 MGD reported by 11 plants
Klarifi identifies 13 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Arkansas, 4% of the 324 plants in the state (53 MGD reported by 11 plants). The largest is Fayetteville/ West Side WWTP in Fayetteville at 10.18 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 Arkansas
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Fayetteville/ West Side WWTP | Fayetteville | 10.18 | ARL050288 | Dec 2030 | 0 |
| 2 | Fort Smith, City Of - P Street Water Reclamation Facility | Fort Smith | 9.55 | ARL033278 | Dec 2030 | 4 |
| 3 | Fort Smith, City Of-Massard Water Reclamation Facility | Barling | 8.03 | AR0021750 | Feb 2026 | 40 |
| 4 | Lrwra-Fourche Creek Water Reclamation Facility | Little Rock | 7.26 | AR0040177 | Jul 2025 | 0 |
| 5 | Fayetteville - Noland WWTP | Fayetteville | 6.32 | AR0020010 | Apr 2029 | 6 |
| 6 | Northwest Arkansas Conservation Authority -Regional WWTP | Bentonville | 3.99 | AR0050024 | Dec 2026 | 160 |
| 7 | Russellville WWTP | Russellville | 3.97 | ARL021768 | Dec 2030 | 46 |
| 8 | Green Forest, City Of - Green Forest WWTP | Green Forest | 2.53 | AR0021741 | Mar 2027 | 0 |
| 9 | Ozark, City Of | Ozark | 0.74 | AR0021563 | Aug 2024 | 2 |
| 10 | Yellville, City Of | Yellville | 0.25 | AR0034037 | Mar 2026 | 29 |
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 Arkansas
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Arkansas: 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 · Inflow and infiltration · Biological nutrient removal · all terms