What is the address of Warren STP?

The address on the plant’s EPA facility record is R.R. #1, Fiedler Road, Warren, IL 61087, in Jo Daviess County. Its coordinates are 42.4892, -89.9995. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Warren STP treat?

Warren STP treats an average of 0.15 MGD and is permitted for a design flow of 0.66 MGD.

What treatment technology does Warren STP use?

Klarifi has identified 4 treatment structures and unit processes at the Warren facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Warren STP?

The facility discharges under NPDES permit IL0026301, currently effective, expiring December 2027.

Is Warren STP in compliance?

Discharge monitoring reports show 1 violation at Warren STP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Warren STP and how do I contact them?

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

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Warren STP

R.R. #1, Fiedler Road, Warren, IL 61087 · Jo Daviess County · Publicly Owned Treatment Works

Average flow: 0.15 MGD

Design flow: 0.66 MGD

NPDES permit: IL0026301; Effective

Permit expires: December 2027

Population served: 1,323; CWNS 2022

Warren STP is a publicly owned wastewater treatment works in Warren, Jo Daviess County, Illinois treating an average of 0.15 million gallons per day against a permitted design capacity of 0.66 MGD, serving about 1,323 residents. It discharges under NPDES permit IL0026301 (effective), which expires in December 2027, with 1 recorded violation in the last three years.

Treatment technology

4 treatment structures and unit processes identified at Warren STP.

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

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Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

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

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

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Warren 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 September 28, 2026.

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

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