Torrelaguna Wastewater Treatment Plant, Torrelaguna, Comunidad de Madrid, Spain

The Torrelaguna wastewater treatment plant is located in the town of Torrelaguna, in the Comunidad de Madrid, Spain. It serves a population of 4,823 and is designed with a capacity of 15,000 m³/day, currently discharging an average of 843.61 m³/day of treated wastewater. The plant provides advanced treatment, ensuring high-quality effluent before discharge. As a facility in Spain, the plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on the size of the agglomeration and the sensitivity of the receiving environment. For a small agglomeration like Torrelaguna, secondary treatment is typically required, but the plant goes beyond with advanced treatment, likely due to local environmental considerations. The treated effluent is discharged into the local watershed, which ultimately drains into the Jarama River, a tributary of the Tagus River. The Tagus River flows westward through Spain and Portugal, emptying into the Atlantic Ocean near Lisbon. The plant's advanced treatment helps protect the ecological health of the Jarama and Tagus river systems, which support diverse aquatic life and are important for regional water resources.

The Torrelaguna plant discharges into the Jarama River basin, part of the larger Tagus River watershed. The Tagus River is one of the longest rivers in the Iberian Peninsula, flowing through central Spain and Portugal before reaching the Atlantic Ocean. The river supports a variety of fish species and provides habitat for migratory birds. Advanced treatment at the plant helps reduce nutrient loading and protects downstream water quality in this ecologically sensitive river system.