How much wastewater does Chatsworth STP treat?

Chatsworth STP treats an average of 0.03 MGD and is permitted for a design flow of 0.46 MGD.

What treatment technology does Chatsworth STP use?

Klarifi has identified aerated lagoons, uncovered lagoons at the Chatsworth facility.

What is the NPDES permit for Chatsworth STP?

The facility discharges under NPDES permit ILG580091, currently effective, expiring May 2027.

Is Chatsworth STP in compliance?

Discharge monitoring reports show 17 violations at Chatsworth STP in the last three years, 17 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Chatsworth STP and how do I contact them?

Chatsworth STP is a publicly owned treatment works in Chatsworth, Illinois. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Chatsworth STP

Chatsworth, IL · Livingston County · Publicly Owned Treatment Works

Average flow: 0.03 MGD

Design flow: 0.46 MGD

NPDES permit: ILG580091; Effective

Permit expires: May 2027

Population served: 1,256; CWNS 2022

Chatsworth STP is a publicly owned wastewater treatment works in Chatsworth, Livingston County, Illinois treating an average of 0.03 million gallons per day against a permitted design capacity of 0.46 MGD, serving about 1,256 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit ILG580091 (effective), which expires in May 2027, with 17 recorded violations in the last three years.

Treatment technology

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

Aerated lagoons

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Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 17

Effluent violations: 17

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

Key contacts

Decision-makers at Chatsworth STP.

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Chatsworth STP: 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 June 17, 2026.

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