What is the address of Alexis STP?

The address on the plant’s EPA facility record is Rural Route #2, Alexis, IL 61412, in Mercer County. Its coordinates are 41.0582, -90.5662. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Alexis STP treat?

Alexis STP treats an average of 0.23 MGD and is permitted for a design flow of 0.36 MGD.

What treatment technology does Alexis STP use?

Klarifi has identified 3 treatment structures and unit processes at the Alexis facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Alexis STP?

The facility discharges under NPDES permit IL0021211, currently effective, expiring January 2028.

Is Alexis STP in compliance?

Discharge monitoring reports show 175 violations at Alexis STP in the last three years, 175 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Alexis STP and how do I contact them?

Alexis STP is a publicly owned treatment works in Alexis, Illinois. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Alexis STP

Rural Route #2, Alexis, IL 61412 · Mercer County · Publicly Owned Treatment Works

Average flow: 0.23 MGD

Design flow: 0.36 MGD

NPDES permit: IL0021211; Effective

Permit expires: January 2028

Population served: 839; CWNS 2022

Alexis STP is a publicly owned wastewater treatment works in Alexis, Mercer County, Illinois treating an average of 0.23 million gallons per day against a permitted design capacity of 0.36 MGD, serving about 839 residents. It discharges under NPDES permit IL0021211 (effective), which expires in January 2028, with 175 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Alexis STP.

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

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Compliance snapshot (last 3 years)

Total violations: 175

Effluent violations: 175

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

Key contacts

1 verified contact for Alexis STP, with validated emails and direct phone numbers.

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

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Alexis 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 November 7, 2025.

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

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