How much wastewater does Harrisburg STP treat?

Harrisburg STP treats an average of 1.1 MGD.

What treatment technology does Harrisburg STP use?

Klarifi has identified clarifiers, uncovered lagoons at the Harrisburg facility.

What is the NPDES permit for Harrisburg STP?

The facility discharges under NPDES permit ILL029149, currently effective, expiring December 2030.

Is Harrisburg STP in compliance?

Discharge monitoring reports show no violations at Harrisburg STP in the last three years.

Who operates Harrisburg STP and how do I contact them?

Harrisburg STP is a publicly owned treatment works in Harrisburg, Illinois. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Harrisburg STP

Harrisburg, IL · Saline County · Publicly Owned Treatment Works

Average flow: 1.1 MGD

Design flow: —

NPDES permit: ILL029149; Effective

Permit expires: December 2030

Population served: 8,404; CWNS 2022

Harrisburg STP is a publicly owned wastewater treatment works in Harrisburg, Saline County, Illinois treating an average of 1.1 million gallons per day, serving about 8,404 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit ILL029149 (effective), which expires in December 2030, with 0 recorded violations in the last three years.

Treatment technology

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

Clarifiers

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Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 0

Effluent violations: 0

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

Key contacts

2 verified contacts for Harrisburg STP, with validated emails and direct phone numbers.

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

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Harrisburg 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 20, 2025.

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