ST CLAIR STP - Port Carbon, Pennsylvania Wastewater Treatment Plant

ST CLAIR STP is a municipal wastewater treatment facility located in Port Carbon, Pennsylvania, within Schuylkill County. The plant serves a population of about 3,500 residents, operating as part of the Saint Clair Sewer Authority's infrastructure. Its inland location places it within the Susquehanna River basin, a major watershed in the northeastern United States. As a US-based plant serving a small population, ST CLAIR STP operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all point-source discharges. For facilities of this scale, secondary treatment is typically mandated to reduce organic pollutants and suspended solids. The plant's design and operational standards align with federal and state regulations administered by the Pennsylvania Department of Environmental Protection. The treated effluent from ST CLAIR STP ultimately drains into the Schuylkill River, a tributary of the Susquehanna River, which flows into the Chesapeake Bay. This connection places the plant within a regionally significant watershed, where nutrient management is critical to protect downstream aquatic ecosystems and the bay's health.

ST CLAIR STP discharges into the Schuylkill River, which flows into the Susquehanna River and ultimately reaches the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and is ecologically sensitive to nutrient pollution, which can cause algal blooms and hypoxia. The plant's operations contribute to local water quality management in the Schuylkill River watershed, supporting aquatic life and recreational uses.