CASTELLO DE RUGAT Wastewater Treatment Plant, Castelló de Rugat, Valencia

The CASTELLO DE RUGAT wastewater treatment plant is located in Castelló de Rugat, a municipality in the Vall d'Albaida region of Valencia, Spain. It serves a population of approximately 3,927 people, classifying it as a small agglomeration under Spanish and EU regulations. The plant operates with secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. Its designed capacity is 3,750 m³/day, with a reported discharge volume of 417.80 m³/day, indicating operational headroom. Treated effluent is discharged into the local hydrological network, which ultimately drains into the Mediterranean Sea via the Serpis River basin. The plant plays a key role in protecting downstream water quality and supporting the ecological health of the region's rivers and coastal waters.

The plant discharges into the Serpis River basin, which flows into the Mediterranean Sea near Gandia. This coastal area supports diverse marine life and is important for local fisheries and tourism. The secondary treatment helps reduce nutrient loads and organic pollutants, mitigating eutrophication risks in the sensitive Mediterranean coastal zone.