Manitowoc WWTP: Municipal Wastewater Treatment in Manitowoc, Wisconsin

Manitowoc WWTP is a municipal wastewater treatment facility located in Manitowoc, Wisconsin, on the western shore of Lake Michigan. It serves a population of about 34,724 people, placing it in the medium-sized agglomeration category for US Great Lakes communities. As a US facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Wisconsin Department of Natural Resources. For plants of this scale, secondary treatment is the minimum standard, though many Great Lakes facilities employ advanced treatment to reduce nutrient loading. The plant's treated effluent discharges into Lake Michigan, part of the Laurentian Great Lakes system, which ultimately drains to the Atlantic Ocean via the St. Lawrence River. Lake Michigan supports diverse aquatic life, including native fish species and migratory birds, and is a critical freshwater resource for millions of people.

The plant discharges into Lake Michigan, a major Great Lake that drains via the Straits of Mackinac into Lake Huron and eventually the St. Lawrence River to the Atlantic Ocean. The nearshore zone supports spawning grounds for lake trout and whitefish, and the lake is a vital stopover for migratory waterfowl. Nutrient management is a key concern to prevent algal blooms in the Great Lakes basin.