Lower Allen Twp STP - Fairview Township, Pennsylvania Wastewater Treatment Plant

Lower Allen Twp STP is a municipal wastewater treatment plant located in Fairview Township, York County, Pennsylvania. The facility serves a population of approximately 23,541 people, placing it in the medium-sized agglomeration category for US wastewater infrastructure. As a US-based plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, typically administered by the Pennsylvania Department of Environmental Protection. For a plant of this scale, secondary treatment is the standard requirement, with potential nutrient removal if discharging to sensitive waters. The plant's treated effluent likely discharges into a tributary of the Susquehanna River, which flows into the Chesapeake Bay. The Chesapeake Bay watershed is a large estuary system of significant ecological importance, supporting diverse aquatic life and subject to nutrient pollution reduction goals under the Chesapeake Bay Total Maximum Daily Load (TMDL).

The plant's discharge ultimately reaches the Susquehanna River, which flows into the Chesapeake Bay, the largest estuary in the United States. The bay supports critical habitats for fish, crabs, and migratory birds, and is subject to nutrient and sediment reduction targets to combat eutrophication. The plant's location in the lower Susquehanna basin places it within a region where wastewater treatment plays a key role in bay restoration efforts.