MARLETTE STP Wastewater Treatment Plant, Marlette, Michigan

MARLETTE STP is a municipal wastewater treatment plant located in Marlette, Michigan, serving a population of about 2,014. The plant is situated in Sanilac County and operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. As a small community facility, it is subject to state-level oversight by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). Typical facilities of this scale in Michigan employ secondary treatment, often using activated sludge or lagoon systems. Under the Clean Water Act, secondary treatment is the minimum standard for municipal plants, ensuring removal of organic matter and suspended solids. Its population served suggests a modest flow. Treated effluent from MARLETTE STP is discharged into a local waterway that drains into the Lake Huron basin, part of the Great Lakes system. Lake Huron is a vital freshwater resource supporting diverse aquatic life, including fish species such as lake trout and walleye. The plant's operations contribute to protecting downstream water quality in this ecologically sensitive region.

The plant discharges into a tributary of the Lake Huron basin, which ultimately flows into Lake Huron, one of the five Great Lakes. Lake Huron supports a rich ecosystem, including spawning grounds for fish and habitat for migratory birds. The watershed is also used for recreation and drinking water, making nutrient and pathogen control critical. The plant's location in a rural agricultural area means it must manage potential impacts from runoff and ensure treated effluent meets state water quality standards.