CORTES Wastewater Treatment Plant, Cortes, Navarra, Spain

The CORTES wastewater treatment plant is located in Cortes, a municipality in the province of Navarra, northern Spain. It serves a population of about 6,001 people, classifying it as a small to medium agglomeration under EU classification. The plant is situated inland, away from coastal areas, and its operations are part of the regional wastewater infrastructure managed by the autonomous community of Navarra. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. It has a designed capacity of 7,500 m³/day and currently discharges 536 m³/day, indicating significant spare capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse, likely the Ebro River basin, as Cortes lies near the Ebro River. The Ebro River flows into the Mediterranean Sea via the Ebro Delta, an ecologically important area. The plant plays a key role in protecting local water quality and downstream ecosystems from untreated wastewater.

Cortes is located in the Ebro River basin, one of Spain's major river systems. The Ebro River flows eastward to the Mediterranean Sea, forming the Ebro Delta, a vital wetland for migratory birds and aquatic life. The plant's secondary treatment helps reduce nutrient and organic pollution, supporting the ecological health of the river and the delta. The region's semi-arid climate makes water quality management crucial for both human use and biodiversity.