Kalispel Bay STP - Secondary Wastewater Treatment in Bonner County, Idaho

Kalispel Bay STP is a municipal wastewater treatment facility located on Lagoon Lane in Bonner County, Idaho, United States. The plant serves a small population of 865 residents, providing secondary treatment to meet Clean Water Act standards. The plant has a designed capacity of 132.49 volume units and currently discharges 68.14 volume units of treated effluent. As a secondary treatment facility, it utilizes biological processes to reduce organic matter and suspended solids before discharge. Under the U.S. EPA National Pollutant Discharge Elimination System (NPDES), plants of this scale are typically permitted by the Idaho Department of Environmental Quality. The treated effluent is discharged into a local water body that drains into the Pend Oreille River system, which ultimately flows into the Columbia River and the Pacific Ocean. The plant plays a role in protecting downstream water quality in this ecologically significant river basin.

The plant discharges into a local water body within the Pend Oreille River watershed, which flows into the Columbia River and eventually the Pacific Ocean. This region supports diverse aquatic life, including salmonid species, and the plant's secondary treatment helps reduce nutrient and pollutant loads that could impact downstream ecosystems.