Coon Valley WWTP - Secondary Treatment Plant in Town of Coon, Wisconsin

Coon Valley WWTP is a municipal wastewater treatment facility located in the Town of Coon, Vernon County, Wisconsin. The plant serves a small population of 717 residents, reflecting its role in a rural community. It operates under the regulatory framework of the United States Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard level required for most municipal facilities in the U.S. to reduce organic matter and suspended solids. With a designed capacity of 685.16 million gallons per year and an actual discharge volume of 121.13 million gallons per year, the plant operates well below its capacity, indicating room for future growth or seasonal variability. The treated effluent is discharged into a local water body, likely a tributary of the Mississippi River basin, given the plant's location in southwestern Wisconsin. The region's waterways support diverse aquatic life and are part of the larger Upper Mississippi River ecosystem, which is ecologically significant for migratory birds and fish species.

The plant discharges into a local stream that flows into the Kickapoo River, a tributary of the Wisconsin River, which ultimately joins the Mississippi River. This watershed supports diverse aquatic habitats and is part of the Driftless Area, known for its unique geology and cold-water streams. The Mississippi River downstream is a major migratory corridor for birds and fish, and the region's water quality is important for both ecological health and recreational use.