Upper Allen Township Grantham STP - Pennsylvania Wastewater Treatment Plant

Upper Allen Township Grantham STP is a municipal wastewater treatment facility located in Upper Allen Township, Cumberland County, Pennsylvania. Serving a population of around 5,913, the plant is part of the region's infrastructure for managing domestic wastewater from the community. As a US-based facility, the plant is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting. Plants of this scale typically employ secondary treatment as a minimum standard, with potential for additional nutrient removal depending on local watershed requirements. The treated effluent from the plant ultimately discharges into the Susquehanna River basin, which flows into the Chesapeake Bay. This makes the plant's operations relevant to downstream water quality in the Chesapeake Bay estuary, a large and ecologically significant water body that supports diverse aquatic life and commercial fisheries.

The plant's discharge enters the Susquehanna River watershed, which drains into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay is a critical habitat for blue crabs, oysters, and migratory fish, and is subject to nutrient pollution reduction goals under the Chesapeake Bay Total Maximum Daily Load (TMDL). The plant's location in Pennsylvania places it within the Susquehanna River basin, a major contributor to the bay's freshwater inflow.