BUTARQUE Wastewater Treatment Plant, Madrid, Spain

BUTARQUE is a major wastewater treatment plant located in the Villaverde district of Madrid, Spain, within the Comunidad de Madrid. It serves a population of over 517,000 people, classifying it as a large agglomeration under EU regulations. The plant is part of Madrid's extensive sanitation infrastructure, which manages wastewater from the capital and its surrounding areas. As a large-scale facility, BUTARQUE is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires tertiary treatment for agglomerations exceeding 150,000 population equivalent in sensitive catchments. The plant's treatment processes are designed to meet these stringent standards, ensuring high-quality effluent before discharge. The plant's scale and regulatory framework indicate robust treatment capabilities. The treated effluent from BUTARQUE is discharged into the Manzanares River, a tributary of the Jarama River, which flows into the Tagus River and ultimately reaches the Atlantic Ocean near Lisbon. This river system supports diverse aquatic life and is ecologically significant for the Iberian Peninsula. The plant plays a critical role in protecting water quality in the Tagus basin, a vital resource for agriculture, drinking water, and biodiversity.

BUTARQUE discharges into the Manzanares River, a tributary of the Jarama River, which joins the Tagus River. The Tagus is the longest river in the Iberian Peninsula, flowing through Spain and Portugal to the Atlantic Ocean. The downstream environment includes ecologically sensitive areas that support diverse fish populations and migratory birds. The plant's advanced treatment helps reduce nutrient loading and pollution, safeguarding water quality for downstream communities and ecosystems.