Notus Sewage Treatment System - Canyon County, Idaho Wastewater Plant

Notus Sewage Treatment System is a municipal wastewater facility located in Canyon County, Idaho, United States. It serves a small population of 531 residents, providing secondary treatment to meet Clean Water Act standards. The plant's designed capacity is 227.12 volume units, with a current discharge volume of 208.20. As a secondary treatment plant, it utilizes biological processes to remove organic matter and suspended solids. Under the US Clean Water Act, such facilities must comply with National Pollutant Discharge Elimination System (NPDES) permits, which set effluent limits to protect water quality. The plant's scale places it in the small community category, where operational oversight often falls to local municipalities. The treated effluent is discharged into a local water body, likely a tributary of the Snake River basin, which ultimately drains to the Columbia River and the Pacific Ocean. The plant's inland location, over 50 km from the coast, reduces direct marine impact but still requires careful management to protect freshwater ecosystems and downstream water quality.

The plant discharges into a local water body within the Snake River basin, which flows into the Columbia River and then the Pacific Ocean. The surrounding region is semi-arid, with agriculture and rural development placing demands on water resources. Protecting the receiving water from nutrient pollution is critical to support aquatic life and downstream uses such as irrigation and recreation.