Warren STP
Warren, IL · Jo Daviess County · Publicly Owned Treatment Works
- Average flow
- 0.11 MGD
- Design flow
- 0.66 MGD
- NPDES permit
- IL0026301
- Effective
- Permit expires
- December 2027
- Population served
- 1,323
- CWNS 2022
Warren STP is a publicly owned wastewater treatment works in Warren, Jo Daviess County, Illinois treating an average of 0.11 million gallons per day against a permitted design capacity of 0.66 MGD, serving about 1,323 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit IL0026301 (effective), which expires in December 2027, with 1 recorded violation 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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Aerated lagoons
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Warren STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Warren STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Apple River · 5 mi away
0.07 MGD
Stockton · 8 mi away
0.41 MGD
Winslow · 10 mi away
0.03 MGD
Lena · 12 mi away
0.18 MGD
Scales Mound · 13 mi away
—
Elizabeth · 17 mi away
0.36 MGD
Cedarville · 20 mi away
0.03 MGD
Hanover · 22 mi away
0.09 MGD
Warren 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 November 7, 2025.