Dauphin Boro STP | Secondary Wastewater Treatment in Dauphin, Pennsylvania

Dauphin Boro STP is a municipal wastewater treatment facility located in Dauphin, Pennsylvania, along the Susquehanna River. The plant serves a small community of about 1,500 people, reflecting its role in managing local wastewater for this rural borough. As a secondary treatment plant, it provides biological treatment to reduce organic pollutants and suspended solids before discharge. The plant has a designed capacity of 757.08 cubic meters per day and currently treats an average daily flow of 378.54 cubic meters, operating at roughly half its capacity. Under the U.S. Clean Water Act, facilities of this scale are typically regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Pennsylvania Department of Environmental Protection. Secondary treatment is the standard requirement for municipal plants, ensuring compliance with federal effluent guidelines. The treated effluent is discharged into the Susquehanna River, which flows south through Pennsylvania and into the Chesapeake Bay. The Susquehanna is the largest river feeding the Chesapeake Bay, making nutrient and pollutant control critical for downstream ecosystems. The plant's secondary treatment helps reduce nutrient loads, supporting the health of the bay's aquatic life and fisheries.

The plant discharges into the Susquehanna River, which drains into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay watershed is ecologically sensitive, supporting diverse aquatic species including blue crabs, oysters, and migratory fish. Nutrient pollution from wastewater and agriculture has historically caused hypoxia and algal blooms, making effective treatment at plants like Dauphin Boro STP vital for bay restoration efforts.