Stony Brook RSA Pennington STP - Hopewell Township, New Jersey Wastewater Treatment Plant

Stony Brook RSA Pennington STP is a municipal wastewater treatment plant located in Hopewell Township, Mercer County, New Jersey. The facility serves a population of approximately 2,776 people, classifying it as a small-scale treatment plant within the state's wastewater infrastructure. As a plant in the United States, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the New Jersey Department of Environmental Protection. For small communities, treatment often involves secondary treatment or equivalent technologies to meet effluent limits. The plant's treated effluent discharges into the Stony Brook watershed, which flows into the Millstone River and ultimately the Raritan River, draining into Raritan Bay and the Atlantic Ocean. The receiving waters support aquatic life and are part of the broader Delaware River basin ecosystem.

The plant discharges into the Stony Brook, a tributary of the Millstone River, which flows into the Raritan River and then Raritan Bay. This watershed supports diverse freshwater and estuarine habitats, including fish spawning and migratory bird routes. The proximity to the Atlantic Ocean means nutrient and pollutant loads can affect coastal water quality and marine ecosystems.