St Johnsbury
799 Bay St, St Johnsbury, VT 05819 · Caledonia County · Publicly Owned Treatment Works
- Average flow
- 0.9 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 0.9 million gallons per day, serving about 5,800 residents. It discharges under NPDES permit VT0100579 (expired), which expires in March 2023, with 18 recorded violations in the last three years.
Treatment technology
10 treatment structures and unit processes identified, 2 planned upgrades on record at St Johnsbury.
Available with a free Klarifi account
See the full treatment train at St Johnsbury: structures, unit processes and planned upgrades, with 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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Nearby wastewater treatment plants in Vermont
Danville · 6 mi away
0.04 MGD
Lyndon · 8 mi away
0.13 MGD
Gilman · 15 mi away
0.05 MGD
Cabot · 15 mi away
0.02 MGD
Marshfield · 17 mi away
0.02 MGD
Hardwick · 19 mi away
0.15 MGD
Plainfield · 22 mi away
0.08 MGD
Barton · 25 mi away
0.1 MGD
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 October 26, 2026; facility record last updated July 29, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms