Wastewater treatment plants in Vermont
76 facilities · 25 MGD combined flow
Klarifi tracks 76 publicly owned wastewater treatment plants in Vermont with a combined average flow of 25 MGD, serving about 198,327 residents. 6 plants treat more than 1 MGD and 0 more than 10 MGD; 22 use lagoon systems and 14 have digesters or biogas infrastructure. The largest is Bennington Wastewater Treatment Facility in Bennington at 3.62 MGD. 2 NPDES permits expire this year and 5 next year.
Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account.
76 plant locations in Vermont; dot size follows average flow. Boundaries: U.S. Census Bureau.
NPDES permits and renewals in Vermont
Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.
Largest wastewater treatment plants in Vermont
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| Bennington Wastewater Treatment Facility | Bennington | 3.62 | — | VT0100021 | Jun 2029 | 7 |
| St Albans City | St Albans | 3.2 | — | VT0100323 | Sep 2022 | 18 |
| Essex Junction Wastewater Treatment Facility | Essex Junction | 2.07 | — | VT0100111 | Jun 2026 | 2 |
| Montpelier Wastewater Treatment Facility | Montpelier | 1.92 | — | VT0100196 | Sep 2022 | 0 |
| Brattleboro Wastewater Treatment Facility | Brattleboro | 1.28 | — | VT0100064 | Sep 2021 | 10 |
| Middlebury Wastewater Treatment Facility | Middlebury | 1.13 | — | VT0100188 | Sep 2013 | 12 |
| St Johnsbury | St Johnsbury | 0.9 | — | VT0100579 | Mar 2023 | 18 |
| Springfield Wastewater Treatment Facility | Springfield | 0.8 | — | VT0100374 | Sep 2020 | 18 |
| Winooski Sewage Treatment Plant | Winooski | 0.64 | — | VT0100510 | Jun 2026 | 0 |
| Bellows Falls Waste Water Treatment Facility | Bellows Falls | 0.55 | — | VT0100013 | Sep 2021 | 59 |
Treatment technology for each plant is shown with a free Klarifi account. Create one →
Vermont plants by treatment technology
All 76 plants in Vermont
Wastewater treatment 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: WWTP · POTW · MGD · NPDES permit · Ozonation · Activated sludge · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “Wastewater treatment plants in Vermont.” Updated October 26, 2026. https://klarifi.io/facilities/vermontNeed a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.