What is the address of Chesterfield STP?

The address on the plant’s EPA facility record is County Highway 22 Extension, Chesterfield, IL 62630, in Macoupin County. Its coordinates are 39.2623, -90.0676. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Chesterfield STP treat?

Chesterfield STP treats an average of 0.00074 MGD and is permitted for a design flow of 0.1 MGD.

What treatment technology does Chesterfield STP use?

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

What is the NPDES permit for Chesterfield STP?

The facility discharges under NPDES permit IL0071331, currently effective, expiring March 2030.

Is Chesterfield STP in compliance?

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

Who operates Chesterfield STP and how do I contact them?

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

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Chesterfield STP

County Highway 22 Extension, Chesterfield, IL 62630 · Macoupin County · Publicly Owned Treatment Works

Average flow: 0.00074 MGD

Design flow: 0.1 MGD

NPDES permit: IL0071331; Effective

Permit expires: March 2030

Population served: —; CWNS 2022

Chesterfield STP is a publicly owned wastewater treatment works in Chesterfield, Macoupin County, Illinois treating an average of 0.00074 million gallons per day against a permitted design capacity of 0.1 MGD. It discharges under NPDES permit IL0071331 (effective), which expires in March 2030, with 20 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Chesterfield STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 20

Effluent violations: 20

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

Key contacts

Decision-makers at Chesterfield STP.

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Nearby wastewater treatment plants in Illinois

Hettick Stp, Village Of

Hettick · 7 mi away

0.0056 MGD

Medora Stp, Village Of

Medora · 7 mi away

0.0091 MGD

Greenfield Wastewater Treatment Plant

Greenfield · 9 mi away

0.00031 MGD

Shipman STP

Shipman · 9 mi away

0.04 MGD

Royal Lakes Stp, Village Of

Royal Lakes · 12 mi away

0.0034 MGD

Palmyra STP

Palmyra · 12 mi away

0.2 MGD

Brighton Stp, Village Of

Brighton · 16 mi away

0.54 MGD

Nilwood, Village Of

Nilwood · 17 mi away

0.02 MGD

Chesterfield 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 21, 2025.

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

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