How much wastewater does Thebes STP treat?

Thebes STP treats an average of 0.02 MGD and is permitted for a design flow of 0.15 MGD.

What treatment technology does Thebes STP use?

Klarifi has identified uncovered lagoons at the Thebes facility.

What is the NPDES permit for Thebes STP?

The facility discharges under NPDES permit ILG580253, currently effective, expiring May 2027.

Is Thebes STP in compliance?

Discharge monitoring reports show 44 violations at Thebes STP in the last three years, 6 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Thebes STP and how do I contact them?

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

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Thebes STP

Thebes, IL · Alexander County · Publicly Owned Treatment Works

Average flow: 0.02 MGD

Design flow: 0.15 MGD

NPDES permit: ILG580253; Effective

Permit expires: May 2027

Population served: 475; CWNS 2022

Thebes STP is a publicly owned wastewater treatment works in Thebes, Alexander County, Illinois treating an average of 0.02 million gallons per day against a permitted design capacity of 0.15 MGD, serving about 475 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ILG580253 (effective), which expires in May 2027, with 44 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: 44

Effluent violations: 6

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

Key contacts

Decision-makers at Thebes STP.

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Thebes 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 6, 2025.

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