Chester STP
Chester, IL · Randolph County · Publicly Owned Treatment Works
- Average flow
- 0.46 MGD
- Design flow
- —
- NPDES permit
- ILL072931
- Effective
- Permit expires
- December 2030
- Population served
- 8,514
- CWNS 2022
Chester STP is a publicly owned wastewater treatment works in Chester, Randolph County, Illinois treating an average of 0.46 million gallons per day, serving about 8,514 residents. Treatment on site includes clarifiers. It discharges under NPDES permit ILL072931 (effective), which expires in December 2030, 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
Unlock
Unlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 5
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Chester STP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Illinois
Ellis Grove · 11 mi away
0.003 MGD
Steeleville · 11 mi away
0.18 MGD
Percy · 13 mi away
—
Willisville · 13 mi away
—
Campbell Hill · 13 mi away
0.05 MGD
Cutler · 15 mi away
—
Evansville · 16 mi away
0.001 MGD
Ava · 17 mi away
—
Chester 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 May 17, 2025.