Castellammare di Stabia NA Impianto Foce Sarno Wastewater Treatment Plant, Campania, Italy

The Castellammare di Stabia NA Impianto Foce Sarno wastewater treatment plant is located in the coastal city of Castellammare di Stabia, in the Campania region of southern Italy. The plant serves a population of approximately 300,000, placing it in the large agglomeration category under the EU Urban Waste Water Treatment Directive (UWWTD). As a major facility, it plays a critical role in managing municipal wastewater from the urban and industrial areas along the Bay of Naples. Under the EU UWWTD, agglomerations larger than 150,000 population equivalents (PE) are required to provide secondary treatment, and in sensitive areas, tertiary treatment. The Sarno River basin is designated as a sensitive area due to eutrophication risks, so the plant is expected to meet advanced treatment standards. The plant's scale and location imply compliance with stringent Italian and EU regulations for nutrient removal and pathogen control. The plant discharges treated effluent into the Sarno River, which flows through the Sarno River Valley and empties into the Tyrrhenian Sea near Pompeii. The Sarno is known for severe pollution from agricultural runoff and industrial discharges, making the plant's performance crucial for improving water quality in the river and the coastal marine environment. The downstream area includes the Gulf of Naples, a ecologically sensitive marine ecosystem supporting fisheries and tourism.

The plant discharges into the Sarno River, which flows through the Campania region and empties into the Tyrrhenian Sea at the Gulf of Naples. The Sarno River basin is heavily impacted by agricultural and industrial activities, leading to high nutrient loads and eutrophication. The downstream marine environment supports diverse aquatic life and is important for local fisheries and tourism. Effective treatment at this plant is essential for reducing pollution loads and protecting the coastal ecosystem.