What is the address of Louisville STP?

The address on the plant’s EPA facility record is South Main Street, Louisville, IL 62858, in Clay County. Its coordinates are 38.7625, -88.4970. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Louisville STP treat?

Louisville STP treats an average of 0.07 MGD and is permitted for a design flow of 0.38 MGD.

What treatment technology does Louisville STP use?

Klarifi has identified one treatment structure or unit process at the Louisville facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

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 28 violations at Louisville STP in the last three years, 10 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

South Main Street, Louisville, IL 62858 · Clay County · Publicly Owned Treatment Works

Average flow: 0.07 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 0.07 million gallons per day against a permitted design capacity of 0.38 MGD, serving about 1,023 residents. It discharges under NPDES permit ILG580081 (effective), which expires in May 2027, with 28 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Louisville STP.

Available with a free Klarifi account

See the full treatment train at Louisville STP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 28

Effluent violations: 10

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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Nearby wastewater treatment plants in Illinois

Flora Stp, City Of

Flora · 8 mi away

0.73 MGD

Iola Stp, Village Of

Iola · 9 mi away

0.04 MGD

Clay City, Village Of

Clay City · 9 mi away

0.19 MGD

Xenia Stp, Village Of

Xenia · 12 mi away

0.03 MGD

Edgewood Stp, Village Of

Edgewood · 14 mi away

0.02 MGD

Mason Stp, Town Of

Mason · 15 mi away

0.09 MGD

Noble Stp, Village Of

Noble · 16 mi away

0.0034 MGD

Farina Stp, Village Of

Farina · 16 mi away

0.1 MGD

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 October 26, 2026; facility record last updated November 7, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms

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