Egg Harbor WWTP - Advanced Wastewater Treatment in Door County, Wisconsin

Egg Harbor WWTP is a municipal wastewater treatment plant located in Egg Harbor, Door County, Wisconsin, along the shores of Lake Michigan. The facility serves a small population of approximately 1,700 residents, typical of a rural coastal community in the Great Lakes region. The plant employs advanced treatment processes, exceeding the secondary treatment standards required by the US Clean Water Act. With a designed capacity of 1,627.72 thousand cubic meters, it operates well below capacity, treating 908.50 thousand cubic meters annually. As a US facility, it operates under an EPA NPDES permit issued by the Wisconsin Department of Natural Resources, ensuring compliance with discharge limits for nutrients and other pollutants. The treated effluent is discharged into the Lake Michigan watershed, a vital freshwater resource supporting diverse aquatic life and recreational activities. The plant's advanced treatment helps protect the lake's water quality, particularly in the sensitive coastal zone of Door County, an area known for its ecological significance and tourism.

The plant discharges into the Lake Michigan basin, part of the Great Lakes system, which ultimately drains to the Atlantic Ocean via the St. Lawrence River. Lake Michigan supports a rich ecosystem, including native fish species and migratory birds. The advanced treatment at this coastal plant helps minimize nutrient loading, reducing the risk of algal blooms and protecting the lake's oligotrophic status.