The 50 largest wastewater treatment plants in Vermont
Ranked by average flow · 24 MGD combined · 98% of the state's reported flow
Bennington Wastewater Treatment Facility in Bennington is the largest publicly owned wastewater treatment plant in Vermont by reported average flow, treating about 3.62 million gallons per day. The 50 plants below treat 24 MGD between them, 98% of the flow reported by all 76 plants in the state, and serve about 185,928 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.
| # | Facility | City | Avg flow (MGD) | Population | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| 1 | Bennington Wastewater Treatment Facility | Bennington | 3.62 | 15,333 | VT0100021 | Jun 2029 | 7 |
| 2 | St Albans City | St Albans | 3.2 | 7,876 | VT0100323 | Sep 2022 | 18 |
| 3 | Essex Junction Wastewater Treatment Facility | Essex Junction | 2.07 | 19,080 | VT0100111 | Jun 2026 | 2 |
| 4 | Montpelier Wastewater Treatment Facility | Montpelier | 1.92 | 10,429 | VT0100196 | Sep 2022 | 0 |
| 5 | Brattleboro Wastewater Treatment Facility | Brattleboro | 1.28 | 12,792 | VT0100064 | Sep 2021 | 10 |
| 6 | Middlebury Wastewater Treatment Facility | Middlebury | 1.13 | 8,500 | VT0100188 | Sep 2013 | 12 |
| 7 | St Johnsbury | St Johnsbury | 0.9 | 5,800 | VT0100579 | Mar 2023 | 18 |
| 8 | Springfield Wastewater Treatment Facility | Springfield | 0.8 | 8,812 | VT0100374 | Sep 2020 | 18 |
| 9 | Winooski Sewage Treatment Plant | Winooski | 0.64 | 6,853 | VT0100510 | Jun 2026 | 0 |
| 10 | Bellows Falls Waste Water Treatment Facility | Bellows Falls | 0.55 | 4,687 | VT0100013 | Sep 2021 | 59 |
| 11 | Burlington Riverside Wastewater Treatment Plant | Burlington | 0.55 | 6,269 | VT0100307 | Sep 2009 | 86 |
| 12 | Swanton Village Wastewater Treatment Facility | Swanton | 0.5 | 3,593 | VT0100501 | Jun 2023 | 13 |
| 13 | Northfield Wastewater Treatment Facility | Northfield | 0.48 | 4,424 | VT0100242 | Sep 2025 | 18 |
| 14 | Brandon WWTF | Brandon | 0.36 | 3,205 | VT0100056 | Mar 2027 | 13 |
| 15 | Milton W P C | Milton | 0.36 | 3,409 | VT0100684 | Jun 2023 | 0 |
| 16 | Stowe WPCF | Stowe | 0.36 | 1,848 | VT0100455 | Sep 2025 | 107 |
| 17 | Waterbury WWTP | Waterbury | 0.35 | 1,807 | VT0100463 | Dec 2025 | 1 |
| 18 | Johnson WPC | Johnson | 0.35 | 3,361 | VT0100901 | Jun 2023 | 0 |
| 19 | Wastewater Treatment Facility #2 | Shelburne | 0.33 | 2,074 | VT0100820 | Dec 2022 | 63 |
| 20 | Morrisville WPCF | Morrisville | 0.31 | 3,146 | VT0100480 | Jun 2023 | 0 |
| 21 | Vergennes WWTF | Vergennes | 0.3 | 2,747 | VT0100404 | Dec 2009 | 82 |
| 22 | Castleton Wastewater Treatment Facility | Castleton | 0.29 | 3,663 | VT0100897 | Jun 2024 | 0 |
| 23 | Ludlow Wastewater Treatment Facility | Ludlow | 0.27 | 1,885 | VT0100145 | Dec 2019 | 24 |
| 24 | Manchester Town Water & Sewer Dept | Manchester | 0.25 | 2,464 | VT0100170 | Sep 2023 | 0 |
| 25 | Champlain Water District | So Burlington | 0.24 | — | VT0020729 | Mar 2016 | 1 |
| 26 | Woodstock Waste Treatment Plant | Woodstock | 0.24 | 1,500 | VT0100757 | Mar 2020 | 15 |
| 27 | West Rutland | West Rutland | 0.23 | 2,574 | VT0100714 | Sep 2027 | 2 |
| 28 | Windsor Wastewater Treatment Facility | Windsor | 0.22 | 4,242 | VT0100919 | Sep 2021 | 3 |
| 29 | Proctor Wastewater Treatment Facility | Proctor | 0.21 | 2,113 | VT0100528 | Dec 2027 | 27 |
| 30 | Hartford - Quechee | Hartford | 0.2 | 905 | VT0100978 | Sep 2024 | 74 |
| 31 | Randolph | Randolph | 0.17 | 2,715 | VT0100285 | Sep 2020 | 258 |
| 32 | Hinesburg Wastewater Treatment Facility | Hinesburg | 0.16 | 2,300 | VT0101028 | Sep 2028 | 71 |
| 33 | Hardwick Wastewater Treatment Facility | Hardwick | 0.15 | 1,727 | VT0100137 | Jun 2023 | 33 |
| 34 | Lyndon WWTP | Lyndon | 0.13 | 3,133 | VT0100595 | Sep 2021 | 1 |
| 35 | Troy/jay WWTF | Jay | 0.12 | 2,118 | VT0101168 | Jun 2023 | 8 |
| 36 | Chester Mtp | Chester | 0.12 | 1,516 | VT0100081 | Mar 2020 | 104 |
| 37 | Williamstown WPCF | Williamstown | 0.11 | 1,814 | VT0100722 | Dec 2022 | 2 |
| 38 | Canaan Mtp | Canaan | 0.11 | 1,990 | VT0100625 | Mar 2020 | 0 |
| 39 | Richford Wastewater Treatment Facility | Richford | 0.1 | 728 | VT0100790 | Jun 2023 | 83 |
| 40 | Barton Wastewater Treatment Facility | Barton | 0.1 | 2,145 | VT0100641 | Mar 2024 | 16 |
| 41 | Wilmington WWTP | Wilmington | 0.08 | 1,134 | VT0100706 | Sep 2023 | 5 |
| 42 | Pownal | North Pownal | 0.08 | 1,766 | VT0101281 | Mar 2023 | 0 |
| 43 | Orleans Wastewater Treatment Facility | Orleans | 0.08 | 1,265 | VT0100251 | Mar 2024 | 93 |
| 44 | Plainfield Wastewater Treatment Facility | Plainfield | 0.08 | 724 | VT0100781 | Sep 2025 | 84 |
| 45 | Swanton Village Water Treatment Plant | Swanton | 0.07 | — | VT0020877 | Mar 2024 | 1 |
| 46 | Sherburne WPCF | Killington | 0.07 | 1,488 | VT0101141 | Mar 2020 | 0 |
| 47 | Village Of North Troy Mtp | North Troy | 0.07 | 607 | VT0100234 | Jun 2023 | 92 |
| 48 | Richmond Wastewater Treatment Facility | Richmond | 0.06 | 1,714 | VT0100617 | Dec 2025 | 2 |
| 49 | Bradford WPCP | Bradford | 0.06 | 968 | VT0100803 | Dec 2020 | 0 |
| 50 | Putney | Putney | 0.05 | 685 | VT0100277 | Sep 2021 | 13 |
Treatment technology for each plant is shown with a free Klarifi account. Create one →
Largest plants 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 · Biosolids · Filter press · 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. “The 50 largest wastewater treatment plants in Vermont (2026).” Updated October 26, 2026. https://klarifi.io/facilities/vermont/largestNeed a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.