Winooski Sewage Treatment Plant
Winooski, VT · Chittenden County · Publicly Owned Treatment Works
- Average flow
- 0.46 MGD
- Design flow
- —
- NPDES permit
- VT0100510
- Administratively continued
- Permit expires
- June 2026
- Population served
- 6,853
- CWNS 2022
Winooski Sewage Treatment Plant is a publicly owned wastewater treatment works in Winooski, Chittenden County, Vermont treating an average of 0.46 million gallons per day, serving about 6,853 residents. Treatment on site includes clarifiers, biological treatment, other, chemical addition, alum, dechlorination, disinfection, chlorine/ chloramine and other unit processes. It discharges under NPDES permit VT0100510 (administratively continued), which expires in June 2026, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
Unlock
Biological Treatment, Other
unit processChemical Addition, Alum
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processScreening
unit processSludge Blanket, Anaerobic
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Winooski Sewage Treatment Plant.
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Nearby wastewater treatment plants in Vermont
Burlington · 1 mi away
—
So Burlington · 3 mi away
0.25 MGD
Essex Junction · 4 mi away
1.67 MGD
Shelburne · 6 mi away
0.17 MGD
Shelburne · 8 mi away
0.23 MGD
Milton · 11 mi away
0.25 MGD
Richmond · 11 mi away
0.07 MGD
Hinesburg · 12 mi away
0.11 MGD
Winooski Sewage Treatment Plant: frequently asked 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; facility record last updated November 29, 2025.