How much wastewater does Gardner STP treat?

Gardner STP treats an average of 0.11 MGD.

What treatment technology does Gardner STP use?

Klarifi has identified aerated lagoons at the Gardner facility.

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 54 violations at Gardner STP in the last three years, 32 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.

Try for free Log in

Gardner STP

Gardner, IL · Grundy County · Publicly Owned Treatment Works

Average flow: 0.11 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 0.11 million gallons per day, serving about 1,215 residents. Treatment on site includes aerated lagoons. It discharges under NPDES permit ILL028894 (effective), which expires in December 2030, with 54 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Aerated lagoons

Unlock

Unlock exact unit counts →

Compliance snapshot (last 3 years)

Total violations: 54

Effluent violations: 32

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.

Unlock 1 verified contact

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

Try Klarifi free

Nearby wastewater treatment plants in Illinois

South Wilmington East Brooklyn STP

South Wilmington · 2 mi away

0.13 MGD

Mazon Stp, Village Of

Mazon · 7 mi away

0.05 MGD

Diamond Wwtp, Village Of

Diamond · 7 mi away

0.37 MGD

Braidwood Stp, City Of

Braidwood · 7 mi away

0.77 MGD

Coal City Stp, Village Of

Coal City · 7 mi away

0.79 MGD

Essex Wwtp, Village Of

Essex · 7 mi away

0.03 MGD

Verona Stp, Village Of

Verona · 10 mi away

0.03 MGD

Wilmington Stp, City Of

Wilmington · 12 mi away

0.63 MGD

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 September 11, 2026; facility record last updated March 7, 2025.

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free