Chesterfield STP
Chesterfield, IL · Macoupin County · Publicly Owned Treatment Works
- Average flow
- 0.03 MGD
- Design flow
- 0.1 MGD
- NPDES permit
- IL0071331
- Effective
- Permit expires
- March 2030
- Population served
- —
- CWNS 2022
Chesterfield STP is a publicly owned wastewater treatment works in Chesterfield, Macoupin County, Illinois treating an average of 0.03 million gallons per day against a permitted design capacity of 0.1 MGD. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IL0071331 (effective), which expires in March 2030, with 17 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 17
- Effluent violations
- 17
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Chesterfield STP.
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Nearby wastewater treatment plants in Illinois
Hettick · 7 mi away
—
Medora · 7 mi away
0.0048 MGD
Greenfield · 9 mi away
0.00006 MGD
Shipman · 9 mi away
0.05 MGD
Royal Lakes · 12 mi away
0.00006 MGD
Palmyra · 12 mi away
0.14 MGD
Brighton · 16 mi away
0.26 MGD
Nilwood · 17 mi away
0.001 MGD
Chesterfield 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 September 21, 2025.