CDA_ASSIENI Wastewater Treatment Plant, Custonaci, Sicily, Italy

CDA_ASSIENI is a wastewater treatment plant located in Custonaci, a municipality in the province of Trapani, Sicily, Italy. The plant serves a population of approximately 2,664 people, classifying it as a small agglomeration under Italian and EU regulations. Its designed capacity is 2,700 cubic meters per day, with a reported discharge volume of 527.38 cubic meters per day. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters. As a coastal facility within 10 km of the sea, it must comply with additional requirements to protect marine environments. The plant operates under Italy's national implementation of the directive, enforced by regional authorities in Sicily. The treated effluent is discharged into the coastal waters of the Tyrrhenian Sea, near the Gulf of Custonaci. This area supports diverse marine life and is part of the broader Mediterranean ecosystem. The plant's operation helps protect local beaches and coastal habitats from untreated sewage pollution.

The plant discharges into the Tyrrhenian Sea near Custonaci, a coastal area in northwestern Sicily. The receiving waters are part of the Mediterranean Sea, which supports ecologically sensitive seagrass meadows and diverse marine species. The region's karst geology and tourism-dependent economy make proper wastewater treatment critical for maintaining water quality and protecting coastal ecosystems.