Millstadt Stp, Village Of
Millstadt, IL · St. Clair County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- Design flow
- —
- NPDES permit
- ILL032514
- Effective
- Permit expires
- December 2030
- Population served
- 3,994
- CWNS 2022
Millstadt Stp, Village Of is a publicly owned wastewater treatment works in Millstadt, St. Clair County, Illinois treating an average of 0.35 million gallons per day, serving about 3,994 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit ILL032514 (effective), which expires in December 2030, with 57 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 57
- Effluent violations
- 57
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Millstadt Stp, Village Of.
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Nearby wastewater treatment plants in Illinois
Belleville · 6 mi away
0.51 MGD
Smithton · 7 mi away
0.45 MGD
Belleville · 7 mi away
3 MGD
Waterloo · 7 mi away
0.67 MGD
Swansea · 8 mi away
1 MGD
Belleville · 9 mi away
0.71 MGD
Dupo · 9 mi away
0.29 MGD
Freeburg · 9 mi away
0.19 MGD
Millstadt Stp, Village Of: 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 7, 2025.