How much wastewater does Louisville STP treat?

Louisville STP treats an average of 0.008 MGD and is permitted for a design flow of 0.38 MGD.

What treatment technology does Louisville STP use?

Klarifi has identified uncovered lagoons at the Louisville facility.

What is the NPDES permit for Louisville STP?

The facility discharges under NPDES permit ILG580081, currently effective, expiring May 2027.

Is Louisville STP in compliance?

Discharge monitoring reports show 27 violations at Louisville STP in the last three years, 9 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Louisville STP and how do I contact them?

Louisville STP is a publicly owned treatment works in Louisville, Illinois. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Louisville STP

Louisville, IL · Clay County · Publicly Owned Treatment Works

Average flow: 0.008 MGD

Design flow: 0.38 MGD

NPDES permit: ILG580081; Effective

Permit expires: May 2027

Population served: 1,023; CWNS 2022

Louisville STP is a publicly owned wastewater treatment works in Louisville, Clay County, Illinois treating an average of 0.008 million gallons per day against a permitted design capacity of 0.38 MGD, serving about 1,023 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ILG580081 (effective), which expires in May 2027, with 27 recorded violations in the last three years.

Treatment technology

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

Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 27

Effluent violations: 9

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

Key contacts

2 verified contacts for Louisville STP, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Louisville STP, plus the full compliance history and discharge data.

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Louisville 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 November 7, 2025.

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