CALIG Wastewater Treatment Plant, Càlig, Comunitat Valenciana, Spain

CALIG is a wastewater treatment plant located in Càlig, within the Comunitat Valenciana region of Spain. It serves a population of approximately 2,192 people, classifying it as a small agglomeration under EU standards. The plant is situated near the coast, less than 10 km from the Mediterranean Sea, and operates under Spain's implementation of the EU Urban Waste Water Treatment Directive. The plant provides secondary treatment, which is the minimum required for agglomerations of this size under the EU Urban Waste Water Treatment Directive (91/271/EEC). Its designed capacity is 2,800 m³/day, with an average discharge volume of 252.95 m³/day. The facility is part of the municipal wastewater infrastructure managed by local authorities in the Castellón province. Treated effluent from CALIG is discharged into the Mediterranean Sea, contributing to the protection of coastal water quality. The plant plays a key role in safeguarding the marine environment and supporting the ecological health of the nearby coastline, which is important for tourism and local biodiversity.

The plant discharges treated wastewater into the Mediterranean Sea, which receives flows from the Càlig area via local streams. The coastal waters support diverse marine life, including seagrass meadows and fish populations. The region's semi-arid climate means that treated effluent contributes to maintaining base flows in local watercourses, which is critical for aquatic habitats during dry periods.