Villarcayo Wastewater Treatment Plant, Villarcayo de Merindad de Castilla la Vieja | Spain

The Villarcayo wastewater treatment plant is located in Villarcayo de Merindad de Castilla la Vieja, a municipality in the province of Burgos, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 29,100 people, classifying it as a medium-sized agglomeration under Spanish and EU regulations. As a plant in Spain, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. It is expected to comply with national standards. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Ebro River basin. The Ebro River is one of Spain's major rivers, flowing into the Mediterranean Sea. The surrounding area is characterized by a continental Mediterranean climate and supports diverse aquatic life in the river system.

The Villarcayo plant discharges into the local watershed that feeds the Ebro River, which flows into the Mediterranean Sea. The Ebro River basin is ecologically significant, supporting diverse aquatic species and providing important habitat for migratory birds. The region's continental Mediterranean climate influences seasonal flow patterns, and the river's delta is a sensitive coastal ecosystem.