RICHMOND SD St Croix Co STP - Town of Richmond, Wisconsin Wastewater Treatment

RICHMOND SD St Croix Co STP is a municipal wastewater treatment facility located in Town of Richmond, Saint Croix County, Wisconsin. The plant serves a small population of 86 residents and operates as a secondary treatment facility, which is standard for small communities in the United States. The plant has a designed capacity of 30.28 units and currently discharges 26.50 units of treated wastewater, indicating it operates below its capacity. As a US facility, it falls under the Clean Water Act and is regulated by the Wisconsin Department of Natural Resources through an NPDES permit, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body that ultimately drains into the St. Croix River, a tributary of the Mississippi River. The St. Croix River is a National Scenic Riverway known for its ecological significance, supporting diverse aquatic life and recreational uses.

The plant discharges into a local stream that flows into the St. Croix River, which is part of the Mississippi River basin. The St. Croix River is ecologically sensitive, supporting diverse fish and wildlife habitats, and is a key recreational resource. Downstream, the Mississippi River carries water to the Gulf of Mexico, where nutrient loading from upstream sources can contribute to hypoxic zones.