Rosholt STP - Secondary Wastewater Treatment Plant in Rosholt, Wisconsin

Rosholt STP is a municipal wastewater treatment plant located in Rosholt, Portage County, Wisconsin. Serving a small population of 516 residents, the facility provides secondary treatment to meet state and federal water quality standards. The plant is part of the local infrastructure managed under the U.S. Clean Water Act, which requires secondary treatment for municipal discharges. The plant has a designed capacity of 219.55 volume units and a current discharge volume of 177.91 volume units, indicating operational capacity within design limits. As a secondary treatment facility, it uses biological processes to reduce organic matter and suspended solids before discharge. The plant operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Wisconsin Department of Natural Resources, ensuring compliance with effluent limits. The treated effluent is discharged into a nearby water body that drains into the Wisconsin River watershed, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting local streams and groundwater from untreated sewage, supporting aquatic life and recreational uses in the region.

The plant discharges into a local water body within the Wisconsin River basin, which flows into the Mississippi River and eventually the Gulf of Mexico. This watershed supports diverse aquatic ecosystems, including fish and migratory birds. The plant's secondary treatment helps reduce nutrient loading, protecting downstream water quality and preventing eutrophication in sensitive areas.