Horseshoe Bend S_T Facility - Secondary Wastewater Treatment in Horseshoe Bend, Idaho

The Horseshoe Bend S_T Facility is a municipal wastewater treatment plant located in Horseshoe Bend, Idaho, along the Payette River. It serves a small community of approximately 707 people, typical of rural wastewater systems in the western United States. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for most municipal facilities. Under the Clean Water Act, the plant operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Idaho Department of Environmental Quality. The permit sets limits on effluent quality to protect the receiving water body. The plant has a designed capacity of 757.08 cubic meters per day and currently discharges an average of 234.70 cubic meters per day, indicating it operates well below its capacity. The treated effluent is discharged into the Payette River, which flows into the Snake River and ultimately the Columbia River, reaching the Pacific Ocean. The plant plays a crucial role in protecting the Payette River's water quality, supporting aquatic life and downstream uses such as irrigation and recreation.

The plant discharges into the Payette River, a major tributary of the Snake River, which flows into the Columbia River and the Pacific Ocean. The Payette River supports diverse aquatic species, including salmon and trout, and is an important corridor for migratory fish. The plant's secondary treatment helps maintain water quality in this ecologically sensitive watershed.