Leoni TWP STP | Leoni Township, Michigan Wastewater Treatment Plant

Leoni Township STP is a municipal wastewater treatment facility located in Leoni Township, Jackson County, Michigan. The plant serves a population of approximately 54,675 residents, placing it in the medium agglomeration category for US wastewater infrastructure. As a US facility, the plant operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. For a plant of this scale, secondary treatment is typically required, with additional nutrient removal if discharging to sensitive waters. The plant's treated effluent likely discharges to a tributary of the Grand River or directly to the Grand River system, which flows into Lake Michigan. This watershed supports diverse aquatic life and provides drinking water for downstream communities. Proper treatment is essential to prevent nutrient pollution and protect the Great Lakes ecosystem.

The plant's discharge likely enters the Grand River watershed, which drains into Lake Michigan, part of the Great Lakes system. This region supports important fisheries and recreational uses. Nutrient loading from wastewater can contribute to algal blooms in the Great Lakes, making effective treatment critical for ecological health.