Wastewater Treatment Plants in Vermont
64 facilities · 14 MGD combined flow
Klarifi tracks 64 publicly owned wastewater treatment plants in Vermont with a combined average flow of 14 MGD, serving about 176,147 residents. 4 plants treat more than 1 MGD and 0 more than 10 MGD; 30 use lagoon systems and 14 have digesters or biogas infrastructure. The largest is Bennington Wastewater Treatment Facility in Bennington at 2.53 MGD. 2 NPDES permits expire this year and 5 next year.
Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city.
64 plant locations in Vermont; dot size follows average flow.
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 | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Bennington Wastewater Treatment Facility | Bennington | 2.53 | — | VT0100021 | Jun 2029 | Biogas silos | 7 |
| St Albans City | St Albans | 1.77 | — | VT0100323 | Sep 2022 | Clarifiers, Uncovered lagoons, Biogas silos | 18 |
| Essex Junction Wastewater Treatment Facility | Essex Junction | 1.67 | — | VT0100111 | Jun 2026 | Clarifiers, Aerated lagoons, Biogas silos, Biogas balloons | 2 |
| Montpelier Wastewater Treatment Facility | Montpelier | 1.22 | — | VT0100196 | Sep 2022 | Clarifiers, Biogas silos, Biogas balloons | 0 |
| St Johnsbury | St Johnsbury | 0.95 | — | VT0100579 | Mar 2023 | Clarifiers, Biogas silos | 18 |
| Springfield Wastewater Treatment Facility | Springfield | 0.6 | — | VT0100374 | Sep 2020 | Clarifiers, Biogas silos | 18 |
| Winooski Sewage Treatment Plant | Winooski | 0.46 | — | VT0100510 | Jun 2026 | Clarifiers | 0 |
| Waterbury WWTP | Waterbury | 0.39 | — | VT0100463 | Dec 2025 | Aerated lagoons | 1 |
| Northfield Wastewater Treatment Facility | Northfield | 0.33 | — | VT0100242 | Sep 2025 | Biogas silos | 18 |
| Stowe WPCF | Stowe | 0.28 | — | VT0100455 | Sep 2025 | Biogas balloons | 85 |
| Champlain Water District | So Burlington | 0.25 | — | VT0020729 | Mar 2016 | — | 1 |
| Milton W P C | Milton | 0.25 | — | VT0100684 | Jun 2023 | — | 0 |
| Morrisville WPCF | Morrisville | 0.23 | — | VT0100480 | Jun 2023 | — | 1 |
| Wastewater Treatment Facility #2 | Shelburne | 0.23 | — | VT0100820 | Dec 2022 | — | 43 |
| Brandon WWTF | Brandon | 0.22 | — | VT0100056 | Mar 2027 | Clarifiers, Aerated lagoons, Carrousels / oxidation ditches | 12 |
| Swanton Village Wastewater Treatment Facility | Swanton | 0.22 | — | VT0100501 | Jun 2023 | Aerated lagoons, Biogas balloons | 13 |
| Manchester Town Water & Sewer Dept | Manchester | 0.18 | — | VT0100170 | Sep 2023 | Aerated lagoons | 0 |
| Randolph | Randolph | 0.17 | — | VT0100285 | Sep 2020 | Uncovered lagoons | 240 |
| Wastewater Treatment Facility No 1 | Shelburne | 0.17 | — | VT0100331 | Sep 2022 | Aerated lagoons | 25 |
| Castleton Wastewater Treatment Facility | Castleton | 0.17 | — | VT0100897 | Jun 2024 | Biogas balloons | 0 |
| West Rutland | West Rutland | 0.13 | — | VT0100714 | Sep 2027 | Clarifiers | 2 |
| Hinesburg Wastewater Treatment Facility | Hinesburg | 0.11 | — | VT0101028 | Sep 2028 | Aerated lagoons, Uncovered lagoons | 71 |
| Hartford - Quechee | Hartford | 0.11 | — | VT0100978 | Sep 2024 | — | 72 |
| Ludlow Wastewater Treatment Facility | Ludlow | 0.1 | — | VT0100145 | Dec 2019 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 24 |
| Proctor Wastewater Treatment Facility | Proctor | 0.08 | — | VT0100528 | Dec 2027 | Aerated lagoons | 25 |
Vermont plants by treatment technology
All 64 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 September 11, 2026.