Merrillan WWTP - Advanced Wastewater Treatment in Merrillan, Wisconsin

Merrillan WWTP is a municipal wastewater treatment facility located on South Hayden Street in Merrillan, Jackson County, Wisconsin. Serving a population of 717, the plant provides advanced treatment to protect public health and the environment in this rural community. The plant employs advanced treatment processes, exceeding the secondary treatment standard required by the US Clean Water Act. With a designed capacity of 291.48 volume units and a current discharge volume of 257.41, the facility operates efficiently within its capacity. As a US plant, it operates under an NPDES permit issued by the Wisconsin Department of Natural Resources, ensuring compliance with federal and state water quality standards. The treated effluent is discharged into a local water body that drains into the Black River watershed, ultimately reaching the Mississippi River and the Gulf of Mexico. The advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the region's rivers and streams.

The plant discharges into a tributary of the Black River, which flows through western Wisconsin before joining the Mississippi River near La Crosse. The Black River watershed supports diverse aquatic life, including fish species such as smallmouth bass and walleye, and provides habitat for migratory birds. Advanced treatment at Merrillan WWTP helps maintain water quality in this ecologically sensitive river system.