What is the address of Sumner STP?

The address on the plant’s EPA facility record is 110 E South St, Sumner, IL 62466, in Lawrence County. Its coordinates are 38.7195, -87.8649. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Sumner STP treat?

Sumner STP treats an average of 0.07 MGD and is permitted for a design flow of 0.5 MGD.

What treatment technology does Sumner STP use?

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

What is the NPDES permit for Sumner STP?

The facility discharges under NPDES permit ILG580118, currently effective, expiring May 2027.

Is Sumner STP in compliance?

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

Who operates Sumner STP and how do I contact them?

Sumner STP is a publicly owned treatment works in Sumner, Illinois. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Sumner STP

110 E South St, Sumner, IL 62466 · Lawrence County · Publicly Owned Treatment Works

Average flow: 0.07 MGD

Design flow: 0.5 MGD

NPDES permit: ILG580118; Effective

Permit expires: May 2027

Population served: 1,191; CWNS 2022

Sumner STP is a publicly owned wastewater treatment works in Sumner, Lawrence County, Illinois treating an average of 0.07 million gallons per day against a permitted design capacity of 0.5 MGD, serving about 1,191 residents. It discharges under NPDES permit ILG580118 (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 Sumner STP.

Available with a free Klarifi account

See the full treatment train at Sumner STP: 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

1 verified contact for Sumner STP, with validated emails and direct phone numbers.

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

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Nearby wastewater treatment plants in Illinois

Claremont Stp, Village Of

Claremont · 5 mi away

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Bridgeport Stp, City Of

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Calhoun Stp, Village Of

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Olney Stp, City Of

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Parkersburg Stp, Village Of

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West Liberty - Dundas STP

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Saint Francisville SW STP

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Allendale - North - Stp, Village Of

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Sumner 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 · Lift station · Sludge dewatering · all terms

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