What is the address of Easton STP?

The address on the plant’s EPA facility record is West Park Street, Easton, IL 62633, in Mason County. Its coordinates are 40.2322, -89.8523. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Easton STP treat?

Easton STP treats an average of 0.14 MGD and is permitted for a design flow of 0.13 MGD.

What treatment technology does Easton STP use?

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

What is the NPDES permit for Easton STP?

The facility discharges under NPDES permit ILG580176, currently effective, expiring May 2027.

Is Easton STP in compliance?

Discharge monitoring reports show 8 violations at Easton STP in the last three years, 8 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Easton STP and how do I contact them?

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

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Easton STP

West Park Street, Easton, IL 62633 · Mason County · Publicly Owned Treatment Works

Average flow: 0.14 MGD

Design flow: 0.13 MGD

NPDES permit: ILG580176; Effective

Permit expires: May 2027

Population served: 386; CWNS 2022

Easton STP is a publicly owned wastewater treatment works in Easton, Mason County, Illinois treating an average of 0.14 million gallons per day against a permitted design capacity of 0.13 MGD, serving about 386 residents. It discharges under NPDES permit ILG580176 (effective), which expires in May 2027, with 8 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Easton STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 8

Effluent violations: 8

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

Key contacts

Decision-makers at Easton STP.

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Nearby wastewater treatment plants in Illinois

Mason City Stp, City Of

Mason City · 9 mi away

0.25 MGD

Havana Stw, City Of

Havana · 12 mi away

0.17 MGD

San Jose Stp, Village Of

San Jose · 14 mi away

0.03 MGD

Manito Stp, Village Of

Manito · 14 mi away

0.06 MGD

Green Valley STP

Green Valley · 14 mi away

0.02 MGD

Petersburg Stp, City Of

Petersburg · 15 mi away

0.31 MGD

Bath Wastewater Treatment Plant, Village Of

Bath · 15 mi away

0.01 MGD

Delavan Stp, City Of

Delavan · 19 mi away

0.37 MGD

Easton 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 November 7, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms

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