What is the address of Williamsfield WWTP?

The address on the plant’s EPA facility record is Route 180, Williamsfield, IL 61489, in Knox County. Its coordinates are 40.9294, -90.0116. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Williamsfield WWTP treat?

Williamsfield WWTP treats an average of 0.07 MGD and is permitted for a design flow of 0.25 MGD.

What treatment technology does Williamsfield WWTP use?

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

What is the NPDES permit for Williamsfield WWTP?

The facility discharges under NPDES permit ILG580087, currently effective, expiring May 2027.

Is Williamsfield WWTP in compliance?

Discharge monitoring reports show 2 violations at Williamsfield WWTP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Williamsfield WWTP and how do I contact them?

Williamsfield WWTP is a publicly owned treatment works in Williamsfield, Illinois. Klarifi lists 3 verified decision-maker contacts for this facility, available with a free trial.

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Williamsfield WWTP

Route 180, Williamsfield, IL 61489 · Knox County · Publicly Owned Treatment Works

Average flow: 0.07 MGD

Design flow: 0.25 MGD

NPDES permit: ILG580087; Effective

Permit expires: May 2027

Population served: —; CWNS 2022

Williamsfield WWTP is a publicly owned wastewater treatment works in Williamsfield, Knox County, Illinois treating an average of 0.07 million gallons per day against a permitted design capacity of 0.25 MGD. It discharges under NPDES permit ILG580087 (effective), which expires in May 2027, with 2 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Williamsfield WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 2

Effluent violations: 2

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

Key contacts

3 verified contacts for Williamsfield WWTP, with validated emails and direct phone numbers.

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

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Williamsfield WWTP: 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 16, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms

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