Willimantic WPCF
2 Main Street, Willimantic, CT 06226 · Windham County · Publicly Owned Treatment Works
- Average flow
- 1.64 MGD
- Design flow
- 5.5 MGD
- NPDES permit
- CT0101001
- Expired
- Permit expires
- October 2023
- Population served
- 24,966
- CWNS 2022
Willimantic WPCF is a publicly owned wastewater treatment works in Willimantic, Windham County, Connecticut treating an average of 1.64 million gallons per day against a permitted design capacity of 5.5 MGD, serving about 24,966 residents. It discharges under NPDES permit CT0101001 (expired), which expires in October 2023, with 1 recorded violation in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Willimantic WPCF.
Available with a free Klarifi account
See the full treatment train at Willimantic WPCF: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Willimantic WPCF, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Willimantic WPCF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Connecticut
Storrs · 8 mi away
1.25 MGD
Baltic · 9 mi away
—
Plainfield · 14 mi away
0.36 MGD
Plainfield · 14 mi away
0.55 MGD
Danielson · 17 mi away
3.4 MGD
Stafford Springs · 17 mi away
0.76 MGD
Montville (uncasville) · 19 mi away
1.25 MGD
Manchester · 19 mi away
5.55 MGD
Willimantic WPCF: 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 March 6, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms