BOECILLO Wastewater Treatment Plant, Boecillo, Castilla y León, Spain

BOECILLO is a wastewater treatment plant located in Boecillo, a municipality in the province of Valladolid, within the autonomous community of Castilla y León, Spain. The plant serves a population of approximately 10,000 people, placing it in the category of a small to medium agglomeration under EU classification. As a Spanish facility, BOECILLO operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations with a population equivalent (PE) between 2,000 and 10,000 discharging into freshwater or estuaries. For larger agglomerations or sensitive areas, tertiary treatment may be required. The regulatory framework ensures compliance with national and EU standards. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and Portugal, emptying into the Atlantic Ocean at Porto. The region's aquatic ecosystems support diverse species, and the plant's operation helps protect water quality in the Duero basin.

The BOECILLO plant discharges into the local watershed within the Duero River basin. The Duero River is one of the major rivers of the Iberian Peninsula, flowing through Spain and Portugal to the Atlantic Ocean. The basin supports diverse aquatic life and is an important ecological corridor. The plant's treatment helps maintain water quality in this sensitive river system, which is vital for agriculture, drinking water, and biodiversity downstream.