How much wastewater does Trenton STP treat?

Trenton STP treats an average of 0.02 MGD and is permitted for a design flow of 1.25 MGD.

What treatment technology does Trenton STP use?

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

What is the NPDES permit for Trenton STP?

The facility discharges under NPDES permit IL0026701, currently effective, expiring March 2028.

Is Trenton STP in compliance?

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

Who operates Trenton STP and how do I contact them?

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

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Trenton STP

Trenton, IL · Clinton County · Publicly Owned Treatment Works

Average flow: 0.02 MGD

Design flow: 1.25 MGD

NPDES permit: IL0026701; Effective

Permit expires: March 2028

Population served: 2,673; CWNS 2022

Trenton STP is a publicly owned wastewater treatment works in Trenton, Clinton County, Illinois treating an average of 0.02 million gallons per day against a permitted design capacity of 1.25 MGD, serving about 2,673 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit IL0026701 (effective), which expires in March 2028, with 9 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: 9

Effluent violations: 9

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

Key contacts

Decision-makers at Trenton STP.

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Trenton 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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