CARO STP - Caro, Michigan Wastewater Treatment Plant

CARO STP is a municipal wastewater treatment plant located on Columbia Street in Caro, Tuscola County, Michigan. It serves a population of about 7,954 people, classifying it as a small to medium-sized facility within the state's wastewater infrastructure. As a US-based plant, CARO STP operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. Plants of this scale typically employ secondary treatment to meet EPA standards. The designed capacity of 1.00 million gallons per day indicates the plant's ability to handle average daily flows. The plant's treated effluent is discharged into local waterways that ultimately drain into the Saginaw Bay of Lake Huron, part of the Great Lakes system. This watershed supports diverse aquatic life and provides drinking water for millions, making proper treatment essential for protecting water quality and ecosystem health.

CARO STP discharges into the Cass River watershed, which flows into the Saginaw River and then into Saginaw Bay, Lake Huron. As part of the Great Lakes Basin, this area is ecologically sensitive, supporting fisheries, migratory birds, and recreational activities. The plant's operations help protect downstream water quality in this internationally significant freshwater system.