Rockland Sewage Treatment System - Power County, Idaho Wastewater Plant

Rockland Sewage Treatment System is a municipal wastewater facility located along State Highway 37 in Power County, Idaho, United States. The plant serves a small population of 295 residents, reflecting its role in a rural community. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant operates under the US Clean Water Act, which requires secondary treatment as the minimum standard for publicly owned treatment works. With a designed capacity of 234.69 units and an average discharge volume of 75.71 units, the facility has reserve capacity to accommodate future growth. The regulatory framework ensures compliance with National Pollutant Discharge Elimination System (NPDES) permits, which set effluent limits to protect water quality. The treated effluent is discharged into a local waterway that ultimately drains into the Snake River basin, a major tributary of the Columbia River. This watershed supports diverse aquatic life and agricultural activities downstream. The plant's inland location, over 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall health of the regional freshwater ecosystem.

The plant discharges into a receiving water body within the Snake River basin, which flows into the Columbia River and eventually reaches the Pacific Ocean. This watershed supports critical habitats for salmon, trout, and other native species. The secondary treatment process reduces nutrient loads, helping to prevent eutrophication in downstream reservoirs and maintaining water quality for irrigation and recreation in the arid Idaho landscape.