Arrubal Agoncillo Wastewater Treatment Plant, Arrúbal, La Rioja, Spain

Arrubal Agoncillo is a wastewater treatment plant located in Arrúbal, a municipality in the autonomous community of La Rioja, Spain. The plant serves a population of about 3,700 residents, making it a small-scale facility within the region's wastewater infrastructure. Its address along Vuelta al Ebro places it in close proximity to the Ebro River, a major watercourse in northeastern Spain. As a Spanish wastewater treatment plant, Arrubal Agoncillo operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 10,000 population equivalent), the directive requires appropriate treatment, typically secondary treatment, to protect receiving waters. The regulatory framework ensures compliance with discharge standards. The plant's location near the Ebro River is significant, as the Ebro flows eastward to the Mediterranean Sea, forming one of Spain's largest river basins. The facility plays a role in protecting the Ebro's water quality, supporting aquatic life and downstream ecosystems. The region's semi-arid climate and agricultural activities underscore the importance of effective wastewater management.

Arrubal Agoncillo discharges treated wastewater into the Ebro River, which flows through La Rioja and ultimately reaches the Mediterranean Sea via the Ebro Delta. The Ebro basin supports diverse aquatic habitats and is an important migratory corridor for fish species. The plant's operations contribute to maintaining water quality in this ecologically sensitive river system, which is vital for local agriculture and biodiversity.