Copper Harbor WWTP - Grant Township, Michigan Wastewater Treatment Plant

Copper Harbor WWTP is a municipal wastewater treatment facility located in Grant Township, Keweenaw County, Michigan, on the Keweenaw Peninsula. The plant serves a small population of 98 residents in the remote Copper Harbor area, a community on the shores of Lake Superior. The plant provides secondary treatment, which is the standard level required under the U.S. Clean Water Act for municipal facilities. With a designed capacity of 75.71 m³/day and an average daily discharge of 37.85 m³/day, the plant operates well within its capacity. As a small facility in a rural setting, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting overseen by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). The treated effluent is discharged into the Lake Superior watershed, the largest of the Great Lakes by volume. Lake Superior is known for its cold, clear waters and supports a diverse aquatic ecosystem, including lake trout, whitefish, and other native species. The plant's proximity to the lake underscores the importance of maintaining treatment standards to protect water quality.

The plant discharges into the Lake Superior basin, which ultimately drains through the St. Marys River into Lake Huron and the Great Lakes system. Lake Superior is a cold, oligotrophic lake with high water clarity and low nutrient levels, making it sensitive to nutrient loading. The surrounding Keweenaw Peninsula features rugged terrain and boreal forests, with numerous small streams feeding the lake. The area supports a variety of fish species and migratory birds, and the lake's shoreline includes ecologically sensitive habitats.