Anaerobic digesters and biogas: wastewater treatment plants in Rhode Island
5 plants · 36% of the state · 30 MGD combined
Klarifi identifies 5 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Rhode Island, 36% of the 14 plants in the state (30 MGD combined). The largest is Narragansett Bay Commission Bucklin Point in East Providence (rumford) at 16.27 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 Rhode Island
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Narragansett Bay Commission Bucklin Point | East Providence (rumford) | 16.27 | RIR50T002 | Aug 2029 | 8 |
| 2 | Cranston Water Pollution Control Facility | Cranston | 5.3 | RIL100013 | Dec 2030 | 6 |
| 3 | East Providence WWTF | East Providence | 4.4 | RI0100048 | Sep 2028 | 70 |
| 4 | Bristol Wastewater Treatment Facility | Bristol | 2.14 | RI0100005 | Mar 2028 | 25 |
| 5 | Westerly Wastewater Treatment Facility | Westerly | 1.56 | RI0100064 | Sep 2026 | 7 |
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 Rhode Island
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Rhode Island: 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.