St Johnsbury
St Johnsbury, VT · Caledonia County · Publicly Owned Treatment Works
- Average flow
- 0.95 MGD
- Design flow
- —
- NPDES permit
- VT0100579
- Expired
- Permit expires
- March 2023
- Population served
- 5,800
- CWNS 2022
St Johnsbury is a publicly owned wastewater treatment plant in St Johnsbury, Caledonia County, Vermont treating an average of 0.95 million gallons per day, serving about 5,800 residents. Treatment on site includes clarifiers, biogas silos, attached growth, aerobic, biosolids anaerobic digestion without energy recovery, biosolids mechanical dewatering and other unit processes. It discharges under NPDES permit VT0100579 (expired), which expires in March 2023, with 18 recorded violations in the last three years. Planned upgrades on record: attached growth, aerobic, screening.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Biogas silos
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Attached Growth, Aerobic
unit processBiosolids Anaerobic Digestion without Energy Recovery
unit processBiosolids Mechanical Dewatering
unit processDechlorination
unit processDisinfection, chlorine/ chloramine
unit processPrimary Clarification or Sedimentation
unit processScreening
unit processSludge Blanket, Anaerobic
unit processAttached Growth, Aerobic
planned upgradeScreening
planned upgradeUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 18
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at St Johnsbury.
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Cabot · 15 mi away
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Marshfield · 17 mi away
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Plainfield · 22 mi away
0.03 MGD
Barton · 25 mi away
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Bradford · 29 mi away
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Orleans · 30 mi away
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Montpelier · 31 mi away
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Morrisville · 31 mi away
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St Johnsbury: 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 July 29, 2026.