Swansea Stp, Village Of
Swansea, IL · St. Clair County · Publicly Owned Treatment Works
- Average flow
- 1 MGD
- Design flow
- 11.89 MGD
- NPDES permit
- IL0021181
- Effective
- Permit expires
- March 2031
- Population served
- 13,543
- CWNS 2022
Swansea Stp, Village Of is a publicly owned wastewater treatment works in Swansea, St. Clair County, Illinois treating an average of 1 million gallons per day against a permitted design capacity of 11.89 MGD, serving about 13,543 residents. Treatment on site includes clarifiers. It discharges under NPDES permit IL0021181 (effective), which expires in March 2031, with 5 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
- 5
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Swansea 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 Swansea Stp, Village Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Belleville · 2 mi away
3 MGD
Belleville · 2 mi away
0.71 MGD
Belleville · 4 mi away
0.51 MGD
O Fallon · 5 mi away
1.75 MGD
O Fallon · 5 mi away
0.38 MGD
Millstadt · 8 mi away
0.35 MGD
Freeburg · 8 mi away
0.19 MGD
Smithton · 8 mi away
0.45 MGD
Swansea 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 August 3, 2026.