What is the address of Harrisburg STP?

The address on the plant’s EPA facility record is East Walnut Street, Harrisburg, IL 62946, in Saline County. Its coordinates are 37.7412, -88.5243. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Harrisburg STP treat?

Harrisburg STP treats an average of 1.37 MGD.

What treatment technology does Harrisburg STP use?

Klarifi has identified 2 treatment structures and unit processes at the Harrisburg facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

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

East Walnut Street, Harrisburg, IL 62946 · Saline County · Publicly Owned Treatment Works

Average flow: 1.37 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 1.37 million gallons per day, serving about 8,404 residents. It discharges under NPDES permit ILL029149 (effective), which expires in December 2030, with 0 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Harrisburg STP.

Available with a free Klarifi account

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

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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 October 26, 2026; facility record last updated March 20, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Centrate · Ozonation · all terms

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