ALMAzAN Wastewater Treatment Plant, Almazán, Castilla y León, Spain

The ALMAzAN wastewater treatment plant is located in Almazán, a municipality in the province of Soria, Castilla y León, Spain. The facility serves a population of around 21,918, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). As a Spanish plant, it operates within the national framework transposing EU directives, ensuring compliance with discharge standards. Under the EU UWWTD, agglomerations of this size (between 10,000 and 100,000 population equivalent) are generally required to provide secondary treatment, with more stringent tertiary treatment if discharging into sensitive areas. The regulatory framework sets clear expectations for effluent quality. The plant discharges into the local watershed, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and into Portugal, reaching the Atlantic Ocean near Porto. The receiving water body supports diverse aquatic life and is important for regional water resources, including irrigation and ecological balance.

The ALMAzAN plant discharges into the Duero River basin, which flows through the Castilla y León region and into Portugal before reaching the Atlantic Ocean. The Duero River supports a variety of fish species and provides water for agriculture and ecosystems. The plant's location inland, over 50 km from the coast, reduces direct marine impact, but its effluent quality is critical for maintaining the ecological health of the river system, particularly in a region with seasonal water availability.