Watseka Stw
Watseka, IL · Iroquois County · Publicly Owned Treatment Works
- Average flow
- 0.58 MGD
- Design flow
- —
- NPDES permit
- ILL022161
- Effective
- Permit expires
- December 2030
- Population served
- 4,767
- CWNS 2022
Watseka Stw is a publicly owned wastewater treatment plant in Watseka, Iroquois County, Illinois treating an average of 0.58 million gallons per day, serving about 4,767 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit ILL022161 (effective), which expires in December 2030, with 20 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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Compliance snapshot (last 3 years)
- Total violations
- 20
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Watseka Stw, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Watseka Stw, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Milford · 12 mi away
—
Gilman · 13 mi away
0.22 MGD
Onarga · 14 mi away
0.05 MGD
Clifton · 15 mi away
0.07 MGD
Saint Anne · 16 mi away
0.08 MGD
Cissna Park · 17 mi away
0.07 MGD
Saint Anne · 24 mi away
0.03 MGD
Herscher · 27 mi away
0.1 MGD
Watseka Stw: 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 February 9, 2025.