Wilder Sewage Lagoon - Secondary Wastewater Treatment in Wilder, Idaho

Wilder Sewage Lagoon is a municipal wastewater treatment facility located in Wilder, Idaho, United States. The plant serves a population of approximately 1,613 residents, providing secondary treatment to manage domestic wastewater from the community. As a secondary treatment facility, the plant uses biological processes to reduce organic matter and suspended solids. The designed capacity is 5,488.83 cubic meters per day, with an average discharge volume of 283.91 cubic meters per day. Under the U.S. Clean Water Act, such plants operate under National Pollutant Discharge Elimination System (NPDES) permits issued by the Idaho Department of Environmental Quality, ensuring compliance with effluent limits. The treated effluent is discharged into local water bodies that eventually flow into the Snake River basin, a major tributary of the Columbia River. This watershed supports diverse aquatic life and agricultural activities in southern Idaho. The plant's operations help protect downstream water quality and ecological health.

The plant discharges into the Snake River basin, which flows into the Columbia River and ultimately the Pacific Ocean. This watershed supports critical habitat for salmon and steelhead trout, as well as irrigation for agriculture. The secondary treatment process reduces nutrient loads, helping to prevent eutrophication in downstream reservoirs and maintaining water quality for aquatic ecosystems.