Kewanee STP
Kewanee, IL · Henry County · Publicly Owned Treatment Works
- Average flow
- 1.71 MGD
- Design flow
- 5 MGD
- NPDES permit
- IL0029343
- Effective
- Permit expires
- April 2031
- Population served
- 12,174
- CWNS 2022
Kewanee STP is a publicly owned wastewater treatment works in Kewanee, Henry County, Illinois treating an average of 1.71 million gallons per day against a permitted design capacity of 5 MGD, serving about 12,174 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches, biogas silos. It discharges under NPDES permit IL0029343 (effective), which expires in April 2031, with 37 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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Uncovered lagoons
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Carrousels / oxidation ditches
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Biogas silos
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Compliance snapshot (last 3 years)
- Total violations
- 37
- Effluent violations
- 37
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
5 verified contacts for Kewanee STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Kewanee STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Neponset · 7 mi away
0.05 MGD
Galva · 8 mi away
0.13 MGD
Galva · 10 mi away
—
Toulon · 11 mi away
0.07 MGD
Annawan · 11 mi away
0.08 MGD
Sheffield · 12 mi away
0.13 MGD
Bradford · 13 mi away
0.09 MGD
Buda · 13 mi away
0.07 MGD
Kewanee 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 3, 2025.