How much wastewater does City Of Waterloo STP 3 treat?

City Of Waterloo STP 3 treats an average of 0.67 MGD and is permitted for a design flow of 3.13 MGD.

What treatment technology does City Of Waterloo STP 3 use?

Klarifi has identified uncovered lagoons, biogas balloons at the Waterloo facility.

What is the NPDES permit for City Of Waterloo STP 3?

The facility discharges under NPDES permit IL0077551, currently effective, expiring December 2030.

Is City Of Waterloo STP 3 in compliance?

Discharge monitoring reports show 4 violations at City Of Waterloo STP 3 in the last three years, 4 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates City Of Waterloo STP 3 and how do I contact them?

City Of Waterloo STP 3 is a publicly owned treatment works in Waterloo, Illinois. Klarifi lists 18 verified decision-maker contacts for this facility, available with a free trial.

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City Of Waterloo STP 3

Waterloo, IL · Monroe County · Publicly Owned Treatment Works

Average flow: 0.67 MGD

Design flow: 3.13 MGD

NPDES permit: IL0077551; Effective

Permit expires: December 2030

Population served: 10,536; CWNS 2022

City Of Waterloo STP 3 is a publicly owned wastewater treatment works in Waterloo, Monroe County, Illinois treating an average of 0.67 million gallons per day against a permitted design capacity of 3.13 MGD, serving about 10,536 residents. Treatment on site includes uncovered lagoons, biogas balloons. It discharges under NPDES permit IL0077551 (effective), which expires in December 2030, with 4 recorded violations in the last three years.

Treatment technology

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

Uncovered lagoons

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Biogas balloons

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Compliance snapshot (last 3 years)

Total violations: 4

Effluent violations: 4

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

Key contacts

18 verified contacts for City Of Waterloo STP 3, with validated emails and direct phone numbers.

Unlock 18 verified contacts (15 more than shown)

Names, validated emails and direct phone numbers for decision-makers at City Of Waterloo STP 3, plus the full compliance history and discharge data.

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City Of Waterloo STP 3: 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 16, 2025.

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