AMHERST STP Wastewater Treatment Plant, Amherst, Wisconsin

AMHERST STP is a municipal wastewater treatment facility located in Amherst, Portage County, Wisconsin. It serves a small community of approximately 1,056 residents, providing essential wastewater treatment for the Village of Amherst Business Park and surrounding areas. The plant operates with secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 529.96 million gallons per year and an actual discharge volume of 492.10 million gallons per year, the plant operates below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local waterways that ultimately drain into the Wisconsin River basin, a major tributary of the Mississippi River. This downstream connection highlights the plant's role in protecting water quality in the region's extensive river network, which supports diverse aquatic life and recreational activities.

The plant discharges into receiving waters that flow into the Wisconsin River, a major tributary of the Mississippi River. This watershed supports diverse aquatic ecosystems, including fish species such as walleye and smallmouth bass, and provides habitat for migratory birds. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream water quality in the Mississippi River basin.