ROBERTS STP - Advanced Wastewater Treatment in Roberts, Wisconsin

ROBERTS STP is an advanced wastewater treatment facility located in Roberts, Saint Croix County, Wisconsin. The plant serves a population of approximately 1,662 residents and is part of the municipal infrastructure for the village of Roberts. As an advanced treatment plant, it goes beyond secondary treatment to remove additional nutrients and contaminants, ensuring high-quality effluent. The plant operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all wastewater discharges. For a plant of this scale, typical NPDES permits set limits on biochemical oxygen demand, total suspended solids, and nutrients. The designed capacity of 1,760.21 million gallons per year indicates the plant can handle peak flows, while the actual discharge volume of 352.04 million gallons per year suggests current flows are well within capacity. The treated effluent from ROBERTS STP is discharged into a local waterway that ultimately drains to the St. Croix River, a tributary of the Mississippi River. The St. Croix River is a National Scenic Riverway and supports diverse aquatic life, including fish and mussel species. The plant's advanced treatment helps protect this sensitive river ecosystem from nutrient pollution and other contaminants.

ROBERTS STP discharges into a local stream that flows into the St. Croix River, a major tributary of the Mississippi River. The St. Croix River is ecologically significant, supporting diverse fish populations and serving as a migratory corridor for birds. The advanced treatment at the plant helps maintain water quality in this sensitive watershed, reducing nutrient loads that could cause algal blooms downstream.