Carterville Stp, City Of
Carterville, IL · Williamson County · Publicly Owned Treatment Works
- Average flow
- 0.34 MGD
- Design flow
- 1.05 MGD
- NPDES permit
- IL0025178
- Effective
- Permit expires
- July 2029
- Population served
- 5,848
- CWNS 2022
Carterville Stp, City Of is a publicly owned wastewater treatment works in Carterville, Williamson County, Illinois treating an average of 0.34 million gallons per day against a permitted design capacity of 1.05 MGD, serving about 5,848 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit IL0025178 (effective), which expires in July 2029, 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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Aerated lagoons
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Uncovered lagoons
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Carrousels / oxidation ditches
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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 Carterville Stp, City Of.
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Nearby wastewater treatment plants in Illinois
Carterville · 1 mi away
0.11 MGD
Energy · 3 mi away
0.06 MGD
Cambria · 3 mi away
0.001 MGD
Colp · 3 mi away
0.009 MGD
Hurst · 5 mi away
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Royalton · 8 mi away
—
Desoto · 8 mi away
0.03 MGD
Marion · 9 mi away
1.96 MGD
Carterville Stp, City 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.