Knoxville STP
Knoxville, IL · Knox County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 1.65 MGD
- NPDES permit
- IL0022209
- Effective
- Permit expires
- September 2030
- Population served
- 3,837
- CWNS 2022
Knoxville STP is a publicly owned wastewater treatment works in Knoxville, Knox County, Illinois, serving about 3,837 residents. Treatment on site includes clarifiers. It discharges under NPDES permit IL0022209 (effective), which expires in September 2030, with 2 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
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Knoxville STP.
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Nearby wastewater treatment plants in Illinois
Galesburg · 7 mi away
3.22 MGD
Wataga · 8 mi away
0.005 MGD
Dahinda · 9 mi away
0.03 MGD
Wataga · 9 mi away
0.05 MGD
Abingdon · 10 mi away
0.27 MGD
Maquon · 10 mi away
0.02 MGD
Oneida · 12 mi away
0.05 MGD
Oneida · 13 mi away
0.05 MGD
Knoxville 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 March 28, 2025.