Bethlehem City STP - Major Wastewater Treatment Plant in Bethlehem, Pennsylvania

Bethlehem City STP is a major wastewater treatment facility located in Bethlehem, Pennsylvania, serving a population of around 160,600. Situated in the Lehigh Valley region, the plant is part of the municipal infrastructure managed by the city. As a large agglomeration serving over 100,000 people, the plant is expected to provide at least secondary treatment under the U. S. Clean Water Act. The National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Pennsylvania Department of Environmental Protection, sets effluent limits to protect water quality. The plant discharges treated wastewater into the Lehigh River, a tributary of the Delaware River, which flows into the Delaware Bay and ultimately the Atlantic Ocean. The Delaware River Basin supports diverse aquatic life and serves as a critical water source for millions.

The plant's treated effluent enters the Lehigh River, which flows into the Delaware River, a major waterway that drains into the Delaware Bay and the Atlantic Ocean. The Delaware River Basin is ecologically significant, supporting migratory fish species such as American shad and providing habitat for freshwater mussels. The plant's discharge must comply with water quality standards to protect these downstream ecosystems.