Sussex County MUA Upper Wallkill CS_STP - Hardyston Township, New Jersey Wastewater Treatment

Sussex County MUA Upper Wallkill CS_STP is a municipal wastewater treatment facility located in Hardyston Township, Sussex County, New Jersey. Serving a population of around 19,921, the plant is part of the regional wastewater infrastructure managed by the Sussex County Municipal Utilities Authority. As a US facility, the plant operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the New Jersey Department of Environmental Protection. For a community of this size, secondary treatment is typically required, and the plant's discharge must meet state water quality standards. The plant's treated effluent is discharged into the Upper Wallkill River, a tributary of the Wallkill River, which flows into the Hudson River and ultimately the Atlantic Ocean. The Wallkill River watershed supports diverse aquatic life and is an important ecological corridor in northwestern New Jersey.

The plant discharges into the Upper Wallkill River, part of the Wallkill River watershed that drains into the Hudson River estuary and the Atlantic Ocean. This region supports diverse aquatic species and provides critical habitat for migratory fish. The watershed is ecologically sensitive, with wetlands and floodplains that help filter pollutants and maintain water quality.