Anaerobic digesters and biogas: wastewater treatment plants in Vermont
30 plants · 39% of the state · 19 MGD combined
Klarifi identifies 30 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Vermont, 39% of the 76 plants in the state (19 MGD combined). The largest is Bennington Wastewater Treatment Facility in Bennington at 3.62 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 Vermont
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Bennington Wastewater Treatment Facility | Bennington | 3.62 | VT0100021 | Jun 2029 | 7 |
| 2 | St Albans City | St Albans | 3.2 | VT0100323 | Sep 2022 | 18 |
| 3 | Essex Junction Wastewater Treatment Facility | Essex Junction | 2.07 | VT0100111 | Jun 2026 | 2 |
| 4 | Montpelier Wastewater Treatment Facility | Montpelier | 1.92 | VT0100196 | Sep 2022 | 0 |
| 5 | Brattleboro Wastewater Treatment Facility | Brattleboro | 1.28 | VT0100064 | Sep 2021 | 10 |
| 6 | St Johnsbury | St Johnsbury | 0.9 | VT0100579 | Mar 2023 | 18 |
| 7 | Springfield Wastewater Treatment Facility | Springfield | 0.8 | VT0100374 | Sep 2020 | 18 |
| 8 | Winooski Sewage Treatment Plant | Winooski | 0.64 | VT0100510 | Jun 2026 | 0 |
| 9 | Bellows Falls Waste Water Treatment Facility | Bellows Falls | 0.55 | VT0100013 | Sep 2021 | 59 |
| 10 | Burlington Riverside Wastewater Treatment Plant | Burlington | 0.55 | VT0100307 | Sep 2009 | 86 |
Plants planning anaerobic digesters and biogas upgrades
These plants report anaerobic digesters and biogas as a planned process in the EPA Clean Watersheds Needs Survey: the earliest public signal of a project.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires |
|---|---|---|---|---|
| Montpelier Wastewater Treatment Facility | Montpelier | 1.92 | VT0100196 | Sep 2022 |
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 Vermont
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Vermont: 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 · POTW · MGD · all terms