Colp Stp, Village Of
Colp, IL · Williamson County · Publicly Owned Treatment Works
- Average flow
- 0.009 MGD
- Design flow
- 0.15 MGD
- NPDES permit
- ILG580155
- Effective
- Permit expires
- May 2027
- Population served
- 280
- CWNS 2022
Colp Stp, Village Of is a publicly owned wastewater treatment works in Colp, Williamson County, Illinois treating an average of 0.009 million gallons per day against a permitted design capacity of 0.15 MGD, serving about 280 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ILG580155 (effective), which expires in May 2027, with 31 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
- 31
- Effluent violations
- 31
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Colp Stp, Village Of, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Colp Stp, Village Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Energy · 3 mi away
0.06 MGD
Cambria · 3 mi away
0.001 MGD
Carterville · 3 mi away
0.34 MGD
Carterville · 4 mi away
0.11 MGD
Hurst · 4 mi away
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Royalton · 5 mi away
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Zeigler · 6 mi away
0.03 MGD
Johnston City · 8 mi away
0.42 MGD
Colp Stp, Village Of: 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.