Empuriabrava Wastewater Treatment Plant, Castelló d'Empúries, Catalonia

Empuriabrava wastewater treatment plant is located in Castelló d'Empúries, in the Alt Empordà region of Catalonia, Spain. The plant serves a population of approximately 11,428 residents and is situated near the Mediterranean coast, within the Costa Brava area. As a facility in a coastal tourist region, it plays a key role in managing wastewater from both permanent residents and seasonal visitors. The plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size (between 10,000 and 15,000 population equivalent). Spain has implemented this directive through national legislation, and the plant is subject to regulatory oversight by the Catalan Water Agency (Agència Catalana de l'Aigua). Typical plants of this scale have capacities in the range of thousands of cubic meters per day. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea. The receiving water bodies are part of the Costa Brava coastal ecosystem, known for its biodiversity and tourism value. The plant's operation is critical for protecting the marine environment and supporting the region's ecological and economic sustainability.

The plant discharges into the local river system that flows into the Mediterranean Sea near the Gulf of Roses. This coastal area supports seagrass meadows and fish nurseries, and is an important migratory corridor for birds. The region's tourism-driven economy depends on clean coastal waters, making effective wastewater treatment essential for maintaining water quality and ecosystem health.