BORRIOL Wastewater Treatment Plant, Borriol, Comunitat Valenciana, Spain

The BORRIOL wastewater treatment plant is located in Borriol, a municipality in the province of Castellón, within the Comunitat Valenciana region of eastern Spain. The plant served the local population with secondary treatment before its closure. Its designed capacity was 1500 cubic meters per day, reflecting a small-scale facility typical of smaller inland communities. As a secondary treatment plant, BORRIOL would have met the minimum treatment standards required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of its size. The directive mandates secondary treatment for discharges into freshwater and estuaries, with more stringent requirements for sensitive areas. The plant is situated within 10 km of the Mediterranean coast, meaning its treated effluent would have discharged into a coastal water body or a river system flowing to the sea. The region's drainage ultimately reaches the Mediterranean, which supports diverse marine life and is a key economic and ecological resource for the area.

The plant is located near the Mediterranean coast, within the drainage basin of the region's rivers that flow into the Balearic Sea. The coastal waters support seagrass meadows, fish nurseries, and migratory bird routes. Although the plant is closed, its historical discharges would have affected local water quality, emphasizing the importance of proper treatment to protect marine ecosystems and recreational waters.