ARROYO DE EL SOTO Wastewater Treatment Plant, Móstoles, Spain

ARROYO DE EL SOTO is a wastewater treatment plant located in Móstoles, within the Comunidad de Madrid, Spain. It serves a population of approximately 120,784, classifying it as a large agglomeration under EU regulations. The plant is situated inland, away from coastal areas, and its operations are integral to the region's water management infrastructure. As a large agglomeration, the plant is expected to meet the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment as a minimum, with tertiary treatment required for sensitive areas. The regulatory framework ensures compliance with discharge standards to protect water quality. The treated effluent from ARROYO DE EL SOTO is discharged into local watercourses that ultimately drain into the Tagus River basin, a major river system in Spain. The Tagus River flows westward through central Spain and into Portugal, emptying into the Atlantic Ocean near Lisbon. The plant plays a crucial role in safeguarding the ecological health of this river system and the downstream environments it supports.

The plant discharges into the Tagus River basin, which flows through central Spain and Portugal before reaching the Atlantic Ocean. This river system supports diverse aquatic life and provides water for agriculture, industry, and urban areas. The plant's operations help maintain water quality in the basin, reducing nutrient and pollutant loads that could otherwise impact downstream ecosystems and the Atlantic coastal zone.