Middletown STP Wastewater Treatment Plant, Frederick County, Virginia

Middletown STP is a municipal wastewater treatment facility located in Frederick County, Virginia, United States. The plant serves a small community of 775 residents and operates with advanced treatment capabilities, ensuring high-quality effluent before discharge. The plant has a designed capacity of 832.79 volume units and currently treats 416.40 volume units, indicating it operates below capacity. As a US facility, it falls under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits, which set strict limits on effluent quality to protect receiving waters. The treated wastewater from Middletown STP ultimately drains into the Chesapeake Bay watershed, one of the largest and most ecologically significant estuaries in the United States. The plant's advanced treatment helps reduce nutrient and pollutant loads, contributing to the health of downstream aquatic ecosystems and the bay's recovery efforts.

Middletown STP discharges into local streams that are part of the Potomac River basin, which flows into the Chesapeake Bay. The Chesapeake Bay is a vital estuary supporting diverse marine life, including blue crabs, oysters, and migratory fish. The plant's advanced treatment helps minimize nutrient pollution, which is critical for preventing algal blooms and maintaining oxygen levels in the bay.