Pleasant Hills STP - Jefferson Hills, Pennsylvania Wastewater Treatment Plant

Pleasant Hills Sewage Treatment Plant (STP) is a municipal wastewater facility located in Jefferson Hills, Allegheny County, Pennsylvania. Serving a population of around 22,511, the plant is part of the region's infrastructure managed under the U.S. Clean Water Act. As a medium-sized agglomeration, the plant is expected to provide at least secondary treatment under the National Pollutant Discharge Elimination System (NPDES) permit program. The facility's treatment processes and capacity are designed to meet state and federal effluent guidelines, ensuring compliance with water quality standards. The plant discharges treated effluent into nearby streams that flow into the Monongahela River, a major tributary of the Ohio River. This watershed supports diverse aquatic life and provides drinking water for downstream communities. Proper treatment at Pleasant Hills STP helps protect the ecological health of the Monongahela River basin.

The plant's discharge enters local streams that drain into the Monongahela River, which flows north to join the Ohio River at Pittsburgh. The Monongahela River watershed supports a variety of fish species and is an important resource for recreation and water supply. The plant's operations help maintain water quality in this ecologically sensitive river system.