How much wastewater does Alto Pass Stp, Village Of treat?

Alto Pass Stp, Village Of treats an average of 0.001 MGD and is permitted for a design flow of 0.17 MGD.

What is the NPDES permit for Alto Pass Stp, Village Of?

The facility discharges under NPDES permit IL0080128, currently effective, expiring December 2028.

Is Alto Pass Stp, Village Of in compliance?

Discharge monitoring reports show 59 violations at Alto Pass Stp, Village Of in the last three years, 15 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Alto Pass Stp, Village Of and how do I contact them?

Alto Pass Stp, Village Of is a publicly owned treatment works in Alto Pass, Illinois. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Alto Pass Stp, Village Of

Alto Pass, IL · Union County · Publicly Owned Treatment Works

Average flow: 0.001 MGD

Design flow: 0.17 MGD

NPDES permit: IL0080128; Effective

Permit expires: December 2028

Population served: —; CWNS 2022

Alto Pass Stp, Village Of is a publicly owned wastewater treatment works in Alto Pass, Union County, Illinois treating an average of 0.001 million gallons per day against a permitted design capacity of 0.17 MGD. It discharges under NPDES permit IL0080128 (effective), which expires in December 2028, with 59 recorded violations in the last three years.

Treatment technology

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

Treatment structure data not yet analyzed for this facility.

Compliance snapshot (last 3 years)

Total violations: 59

Effluent violations: 15

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

Key contacts

Decision-makers at Alto Pass Stp, Village Of.

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Alto Pass Stp, Village Of: 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 September 18, 2025.

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