SAN JORGE Wastewater Treatment Plant, Càlig, Comunitat Valenciana, Spain

The SAN JORGE wastewater treatment plant is located in Càlig, a municipality in the Baix Maestrat region of Castellón, Comunitat Valenciana, Spain. This facility serves a population of approximately 1,313 residents, classifying it as a small agglomeration under Spanish and EU regulations. The plant operates at the secondary treatment level, 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. The designed capacity is 2,608 cubic meters per day, with an average daily discharge volume of 159.12 cubic meters, indicating significant reserve capacity. The treated effluent is discharged into the local hydrological network, which ultimately drains into the Mediterranean Sea. The plant's proximity to the coast (within 10 km) means its discharge contributes to the coastal water quality of the Balearic Sea, a sensitive marine environment that supports tourism and fisheries in the region.

The SAN JORGE plant discharges into the Mediterranean Sea via local streams and the Cenia River basin. The coastal waters of the Balearic Sea are ecologically sensitive, supporting seagrass meadows and diverse marine life. The plant's secondary treatment helps reduce organic pollution, but nutrient removal is not required at this scale unless the area is designated as sensitive under the EU UWWTD.