GRANT STP - Secondary Wastewater Treatment Plant in Grant, Michigan

GRANT STP is a municipal wastewater treatment facility located in Grant, Michigan, United States. The plant serves a small community of 686 residents, providing secondary treatment to meet state and federal water quality standards. The plant operates with a designed capacity of 378.54 cubic meters per day and currently discharges an average volume of 264.98 cubic meters per day. As a secondary treatment facility, it utilizes biological processes to reduce organic matter and suspended solids before discharge. The plant is regulated under the U.S. Clean Water Act through the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). The treated effluent is discharged into a local water body that drains into the Muskegon River watershed, eventually reaching Lake Michigan. This inland location supports the protection of downstream aquatic habitats and recreational water uses in the Great Lakes basin.

The plant discharges into a receiving water body within the Muskegon River watershed, which flows into Lake Michigan. Lake Michigan is a major freshwater resource supporting diverse aquatic life, including fish species such as lake trout and whitefish. The watershed provides critical habitat for migratory birds and supports regional biodiversity. The plant's secondary treatment helps reduce nutrient loading and protect water quality in this ecologically significant Great Lakes ecosystem.