Redgranite STP - Secondary Wastewater Treatment Plant in Redgranite, Wisconsin

Redgranite STP is a municipal wastewater treatment facility located in Redgranite, Wisconsin, United States. The plant serves a population of 2,153 and operates under secondary treatment standards, as required by the US Clean Water Act for facilities of this scale. The plant's designed capacity is 1,218.90 million gallons per year, with an actual discharge volume of 605.67 million gallons per year. As a secondary treatment facility, it meets the minimum federal requirements for biological treatment of wastewater, reducing organic matter and suspended solids before discharge. The treated effluent is discharged into a local water body that ultimately drains into the Fox River basin and then to Lake Michigan. This watershed supports diverse aquatic life and provides recreational and drinking water resources for downstream communities. The plant's location within 50 km of Lake Michigan underscores its role in protecting the Great Lakes ecosystem.

The plant discharges into a local waterway that flows into the Fox River, which drains into Lake Michigan via Green Bay. Lake Michigan is a vital freshwater resource supporting fisheries, recreation, and municipal water supplies. The watershed is ecologically sensitive, with wetlands and tributaries that provide habitat for migratory birds and aquatic species. Secondary treatment helps reduce nutrient loading, which is critical to prevent eutrophication in the lake.