What is the address of Chester STP?

The address on the plant’s EPA facility record is Route 3 South, Chester, IL 62233, in Randolph County. Its coordinates are 37.8867, -89.7877. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Chester STP treat?

Chester STP treats an average of 0.62 MGD.

What treatment technology does Chester STP use?

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

What is the NPDES permit for Chester STP?

The facility discharges under NPDES permit ILL072931, currently effective, expiring December 2030.

Is Chester STP in compliance?

Discharge monitoring reports show 5 violations at Chester STP in the last three years, 3 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Chester STP and how do I contact them?

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

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Chester STP

Route 3 South, Chester, IL 62233 · Randolph County · Publicly Owned Treatment Works

Average flow: 0.62 MGD

Design flow: —

NPDES permit: ILL072931; Effective

Permit expires: December 2030

Population served: 8,514; CWNS 2022

Chester STP is a publicly owned wastewater treatment works in Chester, Randolph County, Illinois treating an average of 0.62 million gallons per day, serving about 8,514 residents. It discharges under NPDES permit ILL072931 (effective), which expires in December 2030, with 5 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Chester STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 5

Effluent violations: 3

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

Key contacts

Decision-makers at Chester STP.

No verified contacts on file yet

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Nearby wastewater treatment plants in Illinois

Ellis Grove Stp, Village Of

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Steeleville STP

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Percy Stp, Village Of

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Willisville Stp, Village Of

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Campbell Hill Stp, Village Of

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Cutler Stp, Village Of

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Chester 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 May 17, 2025.

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

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