TRES CANTOS Wastewater Treatment Plant, Tres Cantos, Spain

TRES CANTOS wastewater treatment plant is located in Soto de Viñuelas, Tres Cantos, in the Comunidad de Madrid, Spain. The facility serves a population of approximately 57,758, classifying it as a medium agglomeration under EU regulations. The plant's location in the Madrid region places it within a densely populated urban area with significant water management demands. As a plant serving over 50,000 people, TRES CANTOS is subject to the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment as a minimum for such agglomerations. In sensitive areas, tertiary treatment may be necessary to reduce nutrients and protect receiving waters. The plant's operational details, including specific treatment processes and capacity, are part of the municipal infrastructure managed by local authorities. The treated effluent from TRES CANTOS is discharged into the local watershed, which ultimately drains into the Tagus River basin. The Tagus River is one of the longest rivers in the Iberian Peninsula, flowing through Spain and Portugal before reaching the Atlantic Ocean near Lisbon. The plant plays a crucial role in protecting water quality in this important river system, supporting downstream ecosystems and human water uses.

The TRES CANTOS plant discharges into the local water network that feeds into the Tagus River basin. The Tagus River flows westward through central Spain and Portugal, emptying into the Atlantic Ocean at the Tagus Estuary near Lisbon. This estuary is a vital ecological area, supporting diverse aquatic life and serving as a key stopover for migratory birds. The plant's operations help maintain water quality in this transboundary river system, which is essential for agriculture, drinking water supply, and biodiversity.