What is the address of Gardner STP?

The address on the plant’s EPA facility record is Carbon Hill Road, Gardner, IL 60424, in Grundy County. Its coordinates are 41.1940, -88.3024. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Gardner STP treat?

Gardner STP treats an average of 0.52 MGD.

What treatment technology does Gardner STP use?

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

What is the NPDES permit for Gardner STP?

The facility discharges under NPDES permit ILL028894, currently effective, expiring December 2030.

Is Gardner STP in compliance?

Discharge monitoring reports show 55 violations at Gardner STP in the last three years, 33 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Gardner STP and how do I contact them?

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

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Gardner STP

Carbon Hill Road, Gardner, IL 60424 · Grundy County · Publicly Owned Treatment Works

Average flow: 0.52 MGD

Design flow: —

NPDES permit: ILL028894; Effective

Permit expires: December 2030

Population served: 1,215; CWNS 2022

Gardner STP is a publicly owned wastewater treatment works in Gardner, Grundy County, Illinois treating an average of 0.52 million gallons per day, serving about 1,215 residents. It discharges under NPDES permit ILL028894 (effective), which expires in December 2030, with 55 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Gardner STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 55

Effluent violations: 33

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

Key contacts

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

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

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Gardner 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 March 7, 2025.

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

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