Cascade Sewage Lagoon - Secondary Wastewater Treatment in Cascade, Idaho

Cascade Sewage Lagoon is a municipal wastewater treatment facility located in Cascade, Valley County, Idaho, United States. The plant serves a population of approximately 8,075 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The plant provides secondary treatment, a standard level for communities of this size in the United States. Its designed capacity is 2,725.49 acre-feet, and it discharges an average of 984.21 acre-feet of treated effluent annually. The facility is operated as part of the town's public works infrastructure. The treated effluent is discharged into a local water body that ultimately drains into the Payette River system, which flows through the Boise National Forest and contributes to the Snake River Basin. This watershed supports diverse aquatic life and provides water for irrigation and recreation in the region.

The Cascade Sewage Lagoon discharges into a tributary of the Payette River, which flows into the Snake River and eventually the Columbia River. The local watershed includes the Cascade Reservoir, a popular recreational area that supports fish species such as trout and salmon. The plant's secondary treatment helps protect water quality in this ecologically sensitive mountain region.