City Of Kalispell WWTP
2001 Airport Road, Kalispell, MT 59901 · Flathead County · Publicly Owned Treatment Works
- Average flow
- 3.96 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 3.96 million gallons per day, serving about 30,040 residents. It discharges under NPDES permit MT0021938 (administratively continued), which expires in July 2020, with 11 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at City Of Kalispell WWTP.
Available with a free Klarifi account
See the full treatment train at City Of Kalispell WWTP: structures, unit processes and planned upgrades, with exact unit counts.
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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Polson · 24 mi away
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Hot Springs · 42 mi away
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Ronan · 46 mi away
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Pablo · 47 mi away
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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 October 26, 2026; facility record last updated September 2, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms