Dupo Stp, Village Of
Dupo, IL · St. Clair County · Publicly Owned Treatment Works
- Average flow
- 0.29 MGD
- Design flow
- 1.54 MGD
- NPDES permit
- IL0026441
- Effective
- Permit expires
- June 2027
- Population served
- 4,858
- CWNS 2022
Dupo Stp, Village Of is a publicly owned wastewater treatment works in Dupo, St. Clair County, Illinois treating an average of 0.29 million gallons per day against a permitted design capacity of 1.54 MGD, serving about 4,858 residents. Treatment on site includes clarifiers. It discharges under NPDES permit IL0026441 (effective), which expires in June 2027, 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
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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
1 verified contact for Dupo Stp, Village Of, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Dupo Stp, Village Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Millstadt · 9 mi away
0.35 MGD
Belleville · 9 mi away
0.51 MGD
Waterloo · 13 mi away
0.67 MGD
Swansea · 13 mi away
1 MGD
Belleville · 13 mi away
3 MGD
Collinsville · 14 mi away
2.59 MGD
O Fallon · 15 mi away
1.75 MGD
O Fallon · 15 mi away
0.38 MGD
Dupo 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 September 11, 2026.