DELCORA Chester STP - Wastewater Treatment Plant Serving Chester, Pennsylvania

DELCORA Chester STP is a major wastewater treatment facility located in Chester, Pennsylvania, serving a population of about 136,000. The plant is part of the Delaware County Regional Water Quality Control Authority (DELCORA) system and plays a key role in managing municipal wastewater for the greater Philadelphia metropolitan area. As a large-scale treatment plant, it operates under the US Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program. Plants serving over 100,000 people typically require advanced treatment to meet stringent effluent limits, especially for nutrients and pathogens, to protect downstream water quality. The plant discharges into the Delaware River, which flows into Delaware Bay and ultimately the Atlantic Ocean. The Delaware River is a critical water source for millions and supports diverse aquatic life, including migratory fish like American shad and sturgeon. Effective treatment at this plant helps maintain the ecological health of the river and estuary.

The plant discharges into the Delaware River, a major waterway that drains into Delaware Bay and the Atlantic Ocean. The Delaware River Basin supports a rich ecosystem, including important fisheries and migratory bird habitats. Downstream waters are ecologically sensitive, requiring robust nutrient and pathogen removal to prevent eutrophication and protect shellfish beds.