FREDERIC STP - Frederic, Wisconsin Wastewater Treatment Plant

FREDERIC STP is a municipal wastewater treatment facility located in Frederic, Polk County, Wisconsin. The plant serves a population of approximately 1,261 residents, making it a small-scale facility within the state's wastewater infrastructure. It operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal plants discharging to surface waters. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. Its designed capacity is 529.96 m³/day, and it currently treats an average of 378.54 m³/day, indicating operational headroom. As a Wisconsin facility, it is subject to state-level NPDES permits issued by the Wisconsin Department of Natural Resources, ensuring compliance with water quality standards. The treated effluent is discharged into a local water body that eventually drains into the St. Croix River watershed, a tributary of the Mississippi River. This region supports diverse aquatic life and is important for recreational activities. The plant's operations help protect downstream water quality in the St. Croix River and the greater Mississippi River system.

The plant discharges into a local stream that flows into the St. Croix River, a National Scenic Riverway known for its ecological significance. The St. Croix River joins the Mississippi River near Prescott, Wisconsin, contributing to the Upper Mississippi River basin. This watershed supports diverse fish populations, migratory birds, and sensitive aquatic habitats. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream ecosystems from eutrophication and contamination.