Selbyville STP Wastewater Treatment Plant, Sussex County, Delaware

Selbyville STP is a municipal wastewater treatment plant located in Sussex County, Delaware, United States. It serves a population of approximately 2,790 residents and has a designed capacity of 1.00 million gallons per day. The plant is situated inland but within 50 kilometers of the Atlantic coast. As a US facility, Selbyville STP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. For a plant serving a small community of this size, secondary treatment is typically required, with possible additional nutrient removal to protect sensitive downstream waters. The plant discharges treated effluent into local waterways that ultimately drain to the Atlantic Ocean via the Delaware Bay or coastal inlets. The region's watershed supports diverse aquatic life and is part of the Mid-Atlantic coastal ecosystem, which includes important habitats for fish and migratory birds. Proper treatment helps maintain water quality in these sensitive environments.

Selbyville STP discharges into local streams that flow into the Delaware Bay and eventually the Atlantic Ocean. The Delaware Bay is a major estuary supporting diverse aquatic life, including horseshoe crabs and migratory shorebirds. The plant's location within 50 km of the coast means its effluent can influence coastal water quality, making nutrient removal important to prevent eutrophication in downstream waters.