How much wastewater does Centralia Stw Main, City Of treat?

Centralia Stw Main, City Of treats an average of 1.12 MGD and is permitted for a design flow of 4.5 MGD.

What treatment technology does Centralia Stw Main, City Of use?

Klarifi has identified clarifiers, uncovered lagoons at the Centralia facility.

What is the NPDES permit for Centralia Stw Main, City Of?

The facility discharges under NPDES permit IL0027979, currently effective, expiring July 2031.

Is Centralia Stw Main, City Of in compliance?

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

Who operates Centralia Stw Main, City Of and how do I contact them?

Centralia Stw Main, City Of is a publicly owned treatment works in Centralia, Illinois. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Centralia Stw Main, City Of

Centralia, IL · Clinton County · Publicly Owned Treatment Works

Average flow: 1.12 MGD

Design flow: 4.5 MGD

NPDES permit: IL0027979; Effective

Permit expires: July 2031

Population served: 12,142; CWNS 2022

Centralia Stw Main, City Of is a publicly owned wastewater treatment plant in Centralia, Clinton County, Illinois treating an average of 1.12 million gallons per day against a permitted design capacity of 4.5 MGD, serving about 12,142 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit IL0027979 (effective), which expires in July 2031, 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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Uncovered lagoons

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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

1 verified contact for Centralia Stw Main, City Of, with validated emails and direct phone numbers.

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

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Centralia Stw Main, 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 19, 2025.

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