How much wastewater does Gun Lake WWTP treat?

Gun Lake WWTP treats an average of 0.54 MGD.

What treatment technology does Gun Lake WWTP use?

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

What is the NPDES permit for Gun Lake WWTP?

The facility discharges under NPDES permit MI0042501, currently administratively continued, expiring October 2025.

Is Gun Lake WWTP in compliance?

Discharge monitoring reports show no violations at Gun Lake WWTP in the last three years.

Who operates Gun Lake WWTP and how do I contact them?

Gun Lake WWTP is a publicly owned treatment works in Shelbyville, Michigan. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Gun Lake WWTP

Shelbyville, MI · Allegan County · Publicly Owned Treatment Works

Average flow: 0.54 MGD

Design flow: —

NPDES permit: MI0042501; Administratively continued

Permit expires: October 2025

Population served: 7,872; CWNS 2022

Gun Lake WWTP is a publicly owned wastewater treatment works in Shelbyville, Allegan County, Michigan treating an average of 0.54 million gallons per day, serving about 7,872 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit MI0042501 (administratively continued), which expires in October 2025, 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

Decision-makers at Gun Lake WWTP.

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Gun Lake WWTP: 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 August 18, 2026.

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