Prairie du Chien WWTP - Municipal Wastewater Treatment in Wisconsin

Prairie du Chien WWTP is a municipal wastewater treatment facility located in Prairie du Chien, Wisconsin, serving a population of about 7,400. The plant is situated near the confluence of the Wisconsin and Mississippi Rivers, in the Driftless Area of southwestern Wisconsin, a region known for its rugged topography and karst geology. As a US facility serving a small agglomeration, the plant operates under the Clean Water Act, administered by the Wisconsin Department of Natural Resources. The National Pollutant Discharge Elimination System (NPDES) permit program sets effluent limits to protect water quality. The treated effluent is discharged into the Mississippi River, which flows southward to the Gulf of Mexico. The Mississippi River is a major ecological corridor, supporting diverse aquatic life and migratory birds. The plant's operations contribute to maintaining water quality in this critical watershed, which faces challenges from agricultural runoff and nutrient pollution.

The plant discharges into the Mississippi River, which drains into the Gulf of Mexico. The Mississippi River basin is one of the largest in North America, supporting a wide array of fish, mussels, and waterfowl. The plant's location in the Driftless Area means local streams are sensitive to pollution due to thin soils and groundwater connections. Downstream, the river contributes to the hypoxic zone in the Gulf, making nutrient removal important for regional water quality.