Pennridge STP Wastewater Treatment Plant, West Rockhill, Pennsylvania

Pennridge STP is a municipal wastewater treatment plant located in West Rockhill, Bucks County, Pennsylvania. It serves a population of about 14,165 residents in the surrounding community, operating as part of the region's water infrastructure. As a US-based facility, the plant is regulated under the Clean Water Act through the National Pollutant Discharge Elimination System (NPDES) permit program. For a plant serving this population size, secondary treatment is typically required, with additional nutrient removal standards in sensitive watersheds like the Delaware River Basin. The plant's treated effluent discharges into local waterways that ultimately drain to the Delaware River and Delaware Bay. This region supports diverse aquatic life and provides drinking water for millions downstream, making effective treatment critical for water quality and ecosystem health.

The plant discharges into tributaries of the Delaware River, which flows into the Delaware Bay and then the Atlantic Ocean. The Delaware River Basin is a major ecological corridor supporting migratory fish like American shad and endangered species such as the Atlantic sturgeon. Nutrient loading from wastewater can contribute to algal blooms and hypoxia in the bay, so advanced treatment is important for protecting downstream habitats.