ARCOS DE JALON Wastewater Treatment Plant, Arcos de Jalón, Castilla y León

The ARCOS DE JALON wastewater treatment plant is located in the municipality of Arcos de Jalón, in the province of Soria, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 2,950 residents, classifying it as a small agglomeration under Spanish and EU regulations. The plant provides secondary treatment, which is the standard biological treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity of 2,950 cubic meters per day aligns with the population served, indicating adequate infrastructure for the community's wastewater needs. The treated effluent is discharged into the local watershed, which ultimately drains into the Jalón River, a tributary of the Ebro River. The Ebro River flows into the Mediterranean Sea, making this plant part of the Ebro basin. The plant plays a key role in protecting the water quality of the Jalón River and downstream ecosystems, including the Ebro Delta, a region of high ecological importance.

The plant discharges into the Jalón River, which flows into the Ebro River, one of Spain's major rivers. The Ebro River drains into the Mediterranean Sea via the Ebro Delta, an ecologically sensitive area that supports diverse aquatic life and important migratory bird populations. The plant's secondary treatment helps reduce organic pollution and nutrient loads, contributing to the health of this downstream environment.