How much wastewater does Marion SE Stp, City Of treat?

Marion SE Stp, City Of treats an average of 1.96 MGD.

What treatment technology does Marion SE Stp, City Of use?

Klarifi has identified clarifiers at the Marion facility.

What is the NPDES permit for Marion SE Stp, City Of?

The facility discharges under NPDES permit ILL029734, currently effective, expiring December 2030.

Is Marion SE Stp, City Of in compliance?

Discharge monitoring reports show 1 violation at Marion SE Stp, City Of in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

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

Marion SE Stp, City Of is a publicly owned treatment works in Marion, Illinois. Klarifi lists 6 verified decision-maker contacts for this facility, available with a free trial.

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Marion SE Stp, City Of

Marion, IL · Williamson County · Publicly Owned Treatment Works

Average flow: 1.96 MGD

Design flow: —

NPDES permit: ILL029734; Effective

Permit expires: December 2030

Population served: 17,620; CWNS 2022

Marion SE Stp, City Of is a publicly owned wastewater treatment works in Marion, Williamson County, Illinois treating an average of 1.96 million gallons per day, serving about 17,620 residents. Treatment on site includes clarifiers. It discharges under NPDES permit ILL029734 (effective), which expires in December 2030, 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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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

6 verified contacts for Marion SE Stp, City Of, with validated emails and direct phone numbers.

Unlock 6 verified contacts (3 more than shown)

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

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Carterville Stp, City Of

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Marion SE 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 September 1, 2025.

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