Johnson City Regional STP - Spurgeon, Tennessee Wastewater Treatment Plant

Johnson City Regional STP is a municipal wastewater treatment facility located on Spurgeon Island Road in Spurgeon, Tennessee, within Washington County. The plant serves an estimated population of 29,000 residents in the Johnson City metropolitan area, reflecting a medium-sized agglomeration typical of the region's urban centers. As a U.S. facility, the plant operates under the Clean Water Act, administered by the Tennessee Department of Environment and Conservation. The National Pollutant Discharge Elimination System (NPDES) permit program sets effluent limits to protect water quality. For a plant serving 29,000 people, secondary treatment is the minimum standard, with potential additional requirements for nutrient removal if discharging to sensitive waters. The plant's treated effluent likely discharges to a tributary of the Watauga River or South Fork Holston River, both part of the Tennessee River basin. The Tennessee River flows into the Ohio River, then the Mississippi River, ultimately reaching the Gulf of Mexico. The watershed supports diverse aquatic life and recreational uses, making proper treatment essential for downstream ecological health.

The plant discharges into the Tennessee River basin, which drains into the Ohio River and then the Mississippi River before reaching the Gulf of Mexico. The local watershed includes the Watauga and South Fork Holston Rivers, which support diverse fish populations and recreational activities. Proper treatment is critical to prevent nutrient loading and protect downstream aquatic ecosystems in this ecologically sensitive region.