Wilson STP - Secondary Wastewater Treatment in Wilson, Wisconsin

Wilson STP is a municipal wastewater treatment facility located in Wilson, Saint Croix County, Wisconsin, United States. The plant serves a small population of 195 residents, reflecting the rural character of the community. It operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard level that removes biodegradable organic matter and suspended solids. With a designed capacity of 90.85 megaliters and an annual discharge volume of 37.85 megaliters, the facility operates well below its capacity. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into a local water body, likely a tributary of the St. Croix River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The plant plays a key role in protecting downstream water quality in this ecologically significant river system.

The plant discharges into a local watercourse that drains into the St. Croix River, a National Scenic Riverway known for its diverse aquatic habitats. The St. Croix River flows south to join the Mississippi River near Prescott, Wisconsin, contributing to the Mississippi's vast drainage basin. The region supports a variety of fish and wildlife, including migratory birds and freshwater mussels, making water quality protection critical.