Harrisburg Authority STP - Wastewater Treatment Plant in Harrisburg, Pennsylvania

The Harrisburg Authority STP is a major wastewater treatment facility located in Harrisburg, Pennsylvania, serving a population of approximately 114,641. Situated in Dauphin County, the plant is a key component of the region's water infrastructure, handling municipal wastewater from the state capital and surrounding areas. As a large-scale facility, the plant is subject to the U. S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting requirements. Facilities of this size typically employ secondary or advanced treatment to meet effluent standards. The plant's capacity and operational status are managed by the Harrisburg Authority, ensuring compliance with federal and state regulations. The treated effluent from the plant is discharged into the Susquehanna River, which flows south through Pennsylvania and into the Chesapeake Bay. This makes the plant's operations critical for protecting downstream water quality, including the ecologically sensitive Chesapeake Bay estuary, which supports diverse aquatic life and is a vital migratory corridor for fish and birds.

The plant discharges into the Susquehanna River, a major tributary of the Chesapeake Bay. The bay is a large estuary that supports a rich ecosystem, including blue crabs, oysters, and migratory fish. Nutrient and pollutant loads from upstream sources like this plant can impact bay health, making treatment standards essential for maintaining water quality and aquatic habitats.