ROSENDALE STP - Advanced Wastewater Treatment in Rosendale, Wisconsin

ROSENDALE STP is an advanced wastewater treatment facility located in Rosendale, Fond du Lac County, Wisconsin. The plant serves a population of 1,958 residents, providing essential sanitation services to this small community in the Midwestern United States. The plant operates with advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 817.65 million gallons per year and an actual discharge volume of 397.47 million gallons, the facility operates well within its capacity. Under the U.S. Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Wisconsin Department of Natural Resources, ensuring compliance with water quality standards. The treated effluent is discharged into local waterways that ultimately drain into the Lake Michigan basin via the Fox River system. This connection to the Great Lakes ecosystem underscores the plant's role in protecting one of the world's largest freshwater resources. Advanced treatment helps minimize nutrient loading, which is critical for preventing algal blooms and maintaining water quality in downstream lakes and rivers.

The plant discharges into tributaries of the Fox River, which flows northward into Lake Winnebago and then via the Lower Fox River to Green Bay, an arm of Lake Michigan. This watershed is part of the Great Lakes Basin, a globally significant freshwater system. The region supports diverse aquatic life, including migratory fish species such as walleye and lake sturgeon. Advanced treatment at this plant helps reduce phosphorus and nitrogen loads, mitigating eutrophication risks in downstream water bodies.