BERCEO Wastewater Treatment Plant, Estollo, La Rioja, Spain

The BERCEO wastewater treatment plant is located in Estollo, a municipality in the autonomous community of La Rioja, Spain. It serves a small population of 902 residents, reflecting its role in a rural setting. The plant is part of Spain's municipal wastewater infrastructure, which operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the standard required by the EU directive for freshwater discharges from agglomerations of this size. With a designed capacity of 2000 m³/day and an average discharge volume of 403.29 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged 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 plant's operations help protect the ecological health of the Ebro basin and downstream coastal waters.

The BERCEO plant discharges into the Ebro River basin, which flows through northeastern Spain and empties into the Mediterranean Sea. The Ebro Delta is an ecologically sensitive area that supports diverse aquatic life and migratory bird populations. Proper wastewater treatment is crucial to prevent nutrient pollution and maintain water quality in this important river system.