Signal Mountain STP - Secondary Wastewater Treatment in Signal Mountain, Tennessee

Signal Mountain STP is a municipal wastewater treatment facility located in Signal Mountain, Tennessee, a town in Hamilton County. The plant serves a population of about 7,725 people, placing it in the small-to-medium agglomeration category under US regulatory frameworks. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater facilities. Its designed capacity is 1,514.16 megaliters per year, and it currently discharges an average volume of 643.52 megaliters annually. As a US facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Tennessee Department of Environment and Conservation, ensuring compliance with effluent limits. The treated effluent is discharged into a local waterway that ultimately drains into the Tennessee River basin. The Tennessee River flows through the southeastern United States and empties into the Ohio River, a major tributary of the Mississippi River. The plant's operations help protect downstream aquatic ecosystems and water quality in the region.

The plant discharges into a tributary of the Tennessee River, which flows through the Appalachian region and supports diverse aquatic life, including fish species such as bass and catfish. The Tennessee River eventually joins the Ohio River and then the Mississippi River, contributing to the Gulf of Mexico watershed. The plant's secondary treatment helps reduce nutrient loads and organic pollutants, protecting downstream water quality and ecological health.