Hub Rock SD 1 STP Wastewater Treatment Plant, Town of Rockbridge, Wisconsin

Hub Rock SD 1 STP is a wastewater treatment facility located in the Town of Rockbridge, Richland County, Wisconsin, United States. It serves a small community of approximately 200 residents, reflecting its role in rural wastewater management. The plant operates under secondary treatment standards, which is the typical requirement for smaller agglomerations under the US Clean Water Act. The plant has a designed capacity of 98.42 units and currently discharges 53.00 units of treated effluent daily. As a secondary treatment facility, it employs biological processes to reduce organic matter and suspended solids before discharge. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Wisconsin Department of Natural Resources, ensuring compliance with federal water quality standards. The treated effluent is discharged into a local water body that ultimately drains into the Wisconsin River watershed, part of the larger Mississippi River basin. This downstream system supports diverse aquatic life and provides water for agricultural and recreational uses. The plant's operation helps protect local streams and rivers from nutrient pollution and pathogens, contributing to the ecological health of the region.

The plant discharges into a receiving water body within the Wisconsin River watershed, which flows into the Mississippi River and eventually the Gulf of Mexico. This downstream system supports diverse aquatic habitats, including fish spawning grounds and migratory bird corridors. The plant's secondary treatment reduces organic pollutants and nutrients, helping to prevent eutrophication in downstream waters.