Thompsonville STP
Thompsonville, IL · Franklin County · Publicly Owned Treatment Works
- Average flow
- 0.02 MGD
- Design flow
- 0.2 MGD
- NPDES permit
- IL0072478
- Effective
- Permit expires
- March 2028
- Population served
- 545
- CWNS 2022
Thompsonville STP is a publicly owned wastewater treatment works in Thompsonville, Franklin County, Illinois treating an average of 0.02 million gallons per day against a permitted design capacity of 0.2 MGD, serving about 545 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit IL0072478 (effective), which expires in March 2028, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Aerated lagoons
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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
Decision-makers at Thompsonville STP.
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Nearby wastewater treatment plants in Illinois
Logan · 6 mi away
0.0019 MGD
Galatia · 9 mi away
0.04 MGD
West Frankfort · 9 mi away
0.7 MGD
Pittsburg · 10 mi away
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Johnston City · 12 mi away
0.42 MGD
Orient · 12 mi away
0.008 MGD
Benton · 12 mi away
0.06 MGD
Ewing · 13 mi away
0.23 MGD
Thompsonville STP: 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 14, 2026.