How much wastewater does Marengo Stp, City Of treat?

Marengo Stp, City Of treats an average of 0.24 MGD and is permitted for a design flow of 5.94 MGD.

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

The facility discharges under NPDES permit IL0020729, currently administratively continued, expiring May 2026.

Is Marengo Stp, City Of in compliance?

Discharge monitoring reports show 46 violations at Marengo Stp, City Of in the last three years, 6 of them effluent limit exceedances. The full history is available in Klarifi.

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

Marengo Stp, City Of is a publicly owned treatment works in Marengo, Illinois. Klarifi lists 9 verified decision-maker contacts for this facility, available with a free trial.

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Marengo Stp, City Of

Q: What treatment technology does Marengo Stp, City Of use?

Klarifi has identified carrousels / oxidation ditches, biogas balloons at the Marengo facility.

Marengo, IL · Mchenry County · Publicly Owned Treatment Works

Average flow: 0.24 MGD

Design flow: 5.94 MGD

NPDES permit: IL0020729; Administratively continued

Permit expires: May 2026

Population served: 7,377; CWNS 2022

Marengo Stp, City Of is a publicly owned wastewater treatment works in Marengo, Mchenry County, Illinois treating an average of 0.24 million gallons per day against a permitted design capacity of 5.94 MGD, serving about 7,377 residents. Treatment on site includes carrousels / oxidation ditches, biogas balloons. It discharges under NPDES permit IL0020729 (administratively continued), which expires in May 2026, with 46 recorded violations in the last three years.

Treatment technology

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

Carrousels / oxidation ditches

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Biogas balloons

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Compliance snapshot (last 3 years)

Total violations: 46

Effluent violations: 6

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

Key contacts

9 verified contacts for Marengo 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 Marengo Stp, City Of, plus the full compliance history and discharge data.

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Marengo 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 August 16, 2026.

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