Waynesboro STP - Washington Township, Pennsylvania Wastewater Treatment Plant

Waynesboro STP is a municipal wastewater treatment facility located in Washington Township, Franklin County, Pennsylvania. Serving a population of around 9,614, the plant is part of the region's infrastructure for managing domestic wastewater in the Conococheague Creek watershed. Under the U.S. Clean Water Act, plants of this scale are typically required to provide secondary treatment through the National Pollutant Discharge Elimination System (NPDES) permit program. The Pennsylvania Department of Environmental Protection oversees compliance, ensuring effluent limits protect water quality in the receiving stream. The plant discharges into a tributary of Conococheague Creek, which flows into the Potomac River and ultimately the Chesapeake Bay. This watershed supports diverse aquatic life and is part of the larger Chesapeake Bay ecosystem, where nutrient management is critical to prevent eutrophication.

Waynesboro STP discharges into a tributary of Conococheague Creek, part of the Potomac River basin that drains into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and is ecologically sensitive to nutrient loading from wastewater. The plant's location inland, over 50 km from the coast, reduces direct marine impact but its discharge contributes to the bay's nutrient budget, making treatment standards important for downstream water quality.