Dimondale WWTP - Secondary Treatment Plant in Eaton County, Michigan

Dimondale WWTP is a municipal wastewater treatment facility located in Eaton County, Michigan, United States. The plant serves a small community of approximately 979 residents, providing secondary treatment to meet local water quality standards. As a secondary treatment plant, Dimondale WWTP utilizes biological processes to remove organic matter and suspended solids from wastewater. The facility has a designed capacity of 378.54 units and currently handles a discharge volume of 416.40 units, indicating operation near or slightly above its design capacity. Under the U.S. Clean Water Act, such plants must comply with National Pollutant Discharge Elimination System (NPDES) permits issued by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). The treated effluent from Dimondale WWTP is discharged into a local waterway that ultimately drains into the Grand River watershed, which flows into Lake Michigan. This connection to the Great Lakes system underscores the importance of effective treatment to protect downstream aquatic ecosystems and drinking water sources.

The plant discharges into a tributary of the Grand River, which flows westward through Michigan and empties into Lake Michigan. Lake Michigan is a vital freshwater resource supporting diverse aquatic life, including fish species such as lake trout and whitefish, and provides drinking water for millions. Effective wastewater treatment is essential to prevent nutrient pollution and protect the ecological health of the Grand River and Lake Michigan.