How much wastewater does Colchester Stp, City Of treat?

Colchester Stp, City Of treats an average of 0.1 MGD and is permitted for a design flow of 0.47 MGD.

What treatment technology does Colchester Stp, City Of use?

Klarifi has identified covered lagoons, uncovered lagoons at the Colchester facility.

What is the NPDES permit for Colchester Stp, City Of?

The facility discharges under NPDES permit IL0028177, currently effective, expiring January 2031.

Is Colchester Stp, City Of in compliance?

Discharge monitoring reports show 12 violations at Colchester Stp, City Of in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Colchester Stp, City Of and how do I contact them?

Colchester Stp, City Of is a publicly owned treatment works in Colchester, Illinois. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Colchester Stp, City Of

Colchester, IL · Mcdonough County · Publicly Owned Treatment Works

Average flow: 0.1 MGD

Design flow: 0.47 MGD

NPDES permit: IL0028177; Effective

Permit expires: January 2031

Population served: 1,755; CWNS 2022

Colchester Stp, City Of is a publicly owned wastewater treatment works in Colchester, Mcdonough County, Illinois treating an average of 0.1 million gallons per day against a permitted design capacity of 0.47 MGD, serving about 1,755 residents. Treatment on site includes covered lagoons, uncovered lagoons. It discharges under NPDES permit IL0028177 (effective), which expires in January 2031, with 12 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Covered lagoons

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Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 12

Effluent violations: 4

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

2 verified contacts for Colchester Stp, City Of, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Colchester Stp, City Of, plus the full compliance history and discharge data.

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Colchester Stp, City 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 November 7, 2025.

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