How much wastewater does Duquoin Stp, City Of treat?

Duquoin Stp, City Of treats an average of 0.42 MGD and is permitted for a design flow of 6 MGD.

What treatment technology does Duquoin Stp, City Of use?

Klarifi has identified clarifiers, aerated lagoons at the Du Quoin facility.

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

The facility discharges under NPDES permit IL0028517, currently effective, expiring July 2031.

Is Duquoin Stp, City Of in compliance?

Discharge monitoring reports show 8 violations at Duquoin Stp, City Of in the last three years, 7 of them effluent limit exceedances. The full history is available in Klarifi.

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

Duquoin Stp, City Of is a publicly owned treatment works in Du Quoin, Illinois. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Duquoin Stp, City Of

Du Quoin, IL · Perry County · Publicly Owned Treatment Works

Average flow: 0.42 MGD

Design flow: 6 MGD

NPDES permit: IL0028517; Effective

Permit expires: July 2031

Population served: 5,827; CWNS 2022

Duquoin Stp, City Of is a publicly owned wastewater treatment works in Du Quoin, Perry County, Illinois treating an average of 0.42 million gallons per day against a permitted design capacity of 6 MGD, serving about 5,827 residents. Treatment on site includes clarifiers, aerated lagoons. It discharges under NPDES permit IL0028517 (effective), which expires in July 2031, with 8 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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Aerated lagoons

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Compliance snapshot (last 3 years)

Total violations: 8

Effluent violations: 7

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

Key contacts

1 verified contact for Duquoin 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 Duquoin Stp, City Of, plus the full compliance history and discharge data.

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Duquoin 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 March 7, 2025.

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