ARROYO CULEBRO CUENCA MEDIA ALTA Wastewater Treatment Plant, Chinchón, Spain

ARROYO CULEBRO CUENCA MEDIA ALTA is a major wastewater treatment plant located in Chinchón, within the Comunidad de Madrid, Spain. Serving a population of approximately 340,108, it is classified as a large agglomeration under EU regulations, requiring advanced treatment to protect sensitive water bodies. As a large-scale facility, it is expected to provide at least secondary treatment, with tertiary treatment likely needed due to the sensitive nature of the receiving environment. The plant operates under Spain's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates strict effluent standards for plants serving over 10,000 population equivalent in sensitive areas. The plant's treated effluent likely discharges into the Tajo River basin, which flows through central Spain and eventually reaches the Atlantic Ocean via the Tagus River. This water body supports diverse aquatic life and is an important resource for irrigation and drinking water downstream. The plant's operation is critical for protecting water quality in the region.

The plant is situated in the Tajo River basin, one of Spain's major watersheds. The Tajo River flows westward through the Iberian Peninsula, passing through the city of Toledo and eventually reaching the Atlantic Ocean near Lisbon, Portugal. The river supports a variety of fish species and provides habitat for migratory birds. Downstream ecosystems rely on adequate treatment to prevent nutrient pollution and maintain ecological balance.