Cowden STP
Cowden, IL · Shelby County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.75 MGD
- NPDES permit
- IL0028231
- Effective
- Permit expires
- August 2028
- Population served
- 472
- CWNS 2022
Cowden STP is a publicly owned wastewater treatment works in Cowden, Shelby County, Illinois, serving about 472 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit IL0028231 (effective), which expires in August 2028, with 69 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 69
- Effluent violations
- 69
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Cowden STP.
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Nearby wastewater treatment plants in Illinois
Herrick · 6 mi away
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Tower Hill · 10 mi away
0.04 MGD
Shelbyville · 11 mi away
0.43 MGD
Shumway · 12 mi away
0.001 MGD
Stewardson · 12 mi away
0.12 MGD
Pana · 13 mi away
0.9 MGD
Altamont · 14 mi away
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Strasburg · 14 mi away
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Cowden 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 7, 2025.