MERCER SD 1 WWTP - Town of Mercer, Wisconsin Wastewater Treatment Plant

MERCER SD 1 WWTP is a municipal wastewater treatment facility located in the Town of Mercer, Wisconsin, United States. It serves a population of approximately 1,816 residents, reflecting a small community in the northern part of the state. The plant operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 314.19 thousand cubic meters per day and a current discharge volume of 170.34 thousand cubic meters per day, the facility operates below its capacity. This indicates adequate headroom for future growth or seasonal variations. The treated effluent is discharged into local surface waters, which ultimately drain into the Lake Superior basin via the Montreal River system. The region is characterized by forested watersheds and cold-water streams that support diverse aquatic life, including trout species. The plant's discharge is regulated to protect downstream water quality and ecological health.

The plant discharges into the Montreal River watershed, which flows northward into Lake Superior, one of the largest freshwater lakes in the world. This region supports cold-water fisheries, including brook trout and lake sturgeon, and is part of a sensitive boreal ecosystem. The watershed's forested landscape and low population density help maintain water quality, but careful management of nutrient and pathogen loads from wastewater is essential to prevent eutrophication and protect recreational uses.