How much wastewater does Mason Stp, Town Of treat?

Mason Stp, Town Of treats an average of 0.09 MGD and is permitted for a design flow of 0.13 MGD.

What treatment technology does Mason Stp, Town Of use?

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

What is the NPDES permit for Mason Stp, Town Of?

The facility discharges under NPDES permit ILG580276, currently effective, expiring May 2027.

Is Mason Stp, Town Of in compliance?

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

Who operates Mason Stp, Town Of and how do I contact them?

Mason Stp, Town Of is a publicly owned treatment works in Mason, Illinois. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Mason Stp, Town Of

Mason, IL 62443 · Effingham County · Publicly Owned Treatment Works

Average flow: 0.09 MGD

Design flow: 0.13 MGD

NPDES permit: ILG580276; Effective

Permit expires: May 2027

Population served: 450; CWNS 2022

Mason Stp, Town Of is a publicly owned wastewater treatment works in Mason, Effingham County, Illinois treating an average of 0.09 million gallons per day against a permitted design capacity of 0.13 MGD, serving about 450 residents. It discharges under NPDES permit ILG580276 (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 Mason Stp, Town Of.

Available with a free Klarifi account

See the full treatment train at Mason Stp, Town Of: 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 Mason Stp, Town Of.

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Nearby wastewater treatment plants in Illinois

Edgewood Stp, Village Of

Edgewood · 3 mi away

0.02 MGD

Watson Wtp, Village Of

Watson · 5 mi away

0.08 MGD

Iola Stp, Village Of

Iola · 8 mi away

0.04 MGD

Altamont North Stp, City Of

Altamont · 10 mi away

0.13 MGD

Effingham STP

Effingham · 11 mi away

2.21 MGD

Farina Stp, Village Of

Farina · 13 mi away

0.1 MGD

St. Peter Stp, Village Of

St Peter · 14 mi away

0.06 MGD

Louisville STP

Louisville · 15 mi away

0.07 MGD

Mason Stp, Town Of: 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 August 19, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms

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