What is the address of Watseka Stw?

The address on the plant’s EPA facility record is North Second St & Sheridan St, Watseka, IL 60970, in Iroquois County. Its coordinates are 40.7836, -87.7376. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Watseka Stw treat?

Watseka Stw treats an average of 1.09 MGD.

What treatment technology does Watseka Stw use?

Klarifi has identified 3 treatment structures and unit processes at the Watseka facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Watseka Stw?

The facility discharges under NPDES permit ILL022161, currently effective, expiring December 2030.

Is Watseka Stw in compliance?

Discharge monitoring reports show 20 violations at Watseka Stw in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Watseka Stw and how do I contact them?

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

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Watseka Stw

North Second St & Sheridan St, Watseka, IL 60970 · Iroquois County · Publicly Owned Treatment Works

Average flow: 1.09 MGD

Design flow: —

NPDES permit: ILL022161; Effective

Permit expires: December 2030

Population served: 4,767; CWNS 2022

Watseka Stw is a publicly owned wastewater treatment plant in Watseka, Iroquois County, Illinois treating an average of 1.09 million gallons per day, serving about 4,767 residents. It discharges under NPDES permit ILL022161 (effective), which expires in December 2030, with 20 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Watseka Stw.

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

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Compliance snapshot (last 3 years)

Total violations: 20

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 Watseka Stw, with validated emails and direct phone numbers.

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

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Watseka Stw: 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 5, 2026; facility record last updated February 9, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms

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