How much wastewater does City Of Kalispell WWTP treat?

City Of Kalispell WWTP treats an average of 3.21 MGD.

What treatment technology does City Of Kalispell WWTP use?

Klarifi has identified clarifiers, biogas silos at the Kalispell facility.

What is the NPDES permit for City Of Kalispell WWTP?

The facility discharges under NPDES permit MT0021938, currently administratively continued, expiring July 2020.

Is City Of Kalispell WWTP in compliance?

Discharge monitoring reports show 11 violations at City Of Kalispell WWTP in the last three years, 11 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates City Of Kalispell WWTP and how do I contact them?

City Of Kalispell WWTP is a publicly owned treatment works in Kalispell, Montana. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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City Of Kalispell WWTP

Kalispell, MT · Flathead County · Publicly Owned Treatment Works

Average flow: 3.21 MGD

Design flow: —

NPDES permit: MT0021938; Administratively continued

Permit expires: July 2020

Population served: 30,040; CWNS 2022

City Of Kalispell WWTP is a publicly owned wastewater treatment works in Kalispell, Flathead County, Montana treating an average of 3.21 million gallons per day, serving about 30,040 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit MT0021938 (administratively continued), which expires in July 2020, with 11 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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Biogas silos

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Compliance snapshot (last 3 years)

Total violations: 11

Effluent violations: 11

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

Key contacts

Decision-makers at City Of Kalispell WWTP.

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City Of Kalispell 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 September 2, 2025.

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