Hollandale STP - Advanced Wastewater Treatment in Hollandale, Wisconsin

Hollandale STP is an advanced wastewater treatment facility located in Hollandale, Wisconsin, serving a small population of 290 residents. The plant is situated in Iowa County and provides essential sanitation services to this rural community. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 113.56 and a discharge volume of 87.06, the facility operates under the regulatory framework of the U.S. Clean Water Act, administered by the Wisconsin Department of Natural Resources. Plants of this scale typically require NPDES permits to ensure compliance with water quality standards. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River Basin. The plant plays a key role in protecting downstream aquatic ecosystems, including the Mississippi River and the Gulf of Mexico, by reducing nutrient loads that can contribute to hypoxia.

The plant discharges into local streams that flow into the Pecatonica River, a tributary of the Rock River, which eventually reaches the Mississippi River. This watershed supports diverse aquatic life and is part of the larger Mississippi River Basin, which drains into the Gulf of Mexico. The advanced treatment helps mitigate nutrient pollution, reducing the risk of algal blooms and hypoxia in downstream waters.