Kalispell WWT Facility - Municipal Wastewater Treatment in Kalispell, Montana

The Kalispell WWT Facility is a municipal wastewater treatment plant located in Kalispell, Montana, serving a population of about 21,000. Situated in the Flathead Valley, the plant is part of the region's infrastructure for managing domestic and industrial wastewater. As a facility in the United States, it operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for any discharge to surface waters. The plant's discharge ultimately reaches the Flathead River system, which flows into Flathead Lake, one of the largest natural freshwater lakes in the western United States. The Flathead watershed is ecologically significant, supporting diverse aquatic life including native trout species and providing habitat for migratory birds. The plant's operations are critical for maintaining water quality in this sensitive ecosystem, as untreated or inadequately treated wastewater could introduce nutrients and pathogens that harm aquatic health. Regulatory oversight ensures compliance with state and federal standards to minimize environmental impact.

The Kalispell WWT Facility discharges into the Flathead River basin, which flows into Flathead Lake, a large natural lake in northwestern Montana. The Flathead watershed is part of the Columbia River drainage, ultimately reaching the Pacific Ocean. This region supports diverse aquatic ecosystems, including native fish populations such as bull trout and westslope cutthroat trout. The plant's effluent must meet stringent water quality standards to protect these species and the recreational uses of the lake and river.