NAVARROSILLOS Wastewater Treatment Plant, Colmenar Viejo, Spain

NAVARROSILLOS is a wastewater treatment plant located in Colmenar Viejo, within the Comunidad de Madrid, Spain. It serves a population of approximately 44,898, classifying it as a medium-sized agglomeration under EU regulations. The plant is situated in an inland area, contributing to the region's water management infrastructure. As a Spanish facility, NAVARROSILLOS operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. The directive requires appropriate treatment to protect receiving water bodies, and Spain has transposed these requirements into national law. The plant's treatment processes are designed to meet these standards, ensuring compliance with environmental regulations. The treated effluent from NAVARROSILLOS is discharged into local watercourses that ultimately drain into the Tagus River basin, one of the Iberian Peninsula's major river systems. The Tagus River flows westward through Spain and Portugal, emptying into the Atlantic Ocean near Lisbon. The plant plays a key role in protecting the ecological health of these waters, supporting aquatic life and downstream communities.

NAVARROSILLOS discharges into local streams that feed the Tagus River basin, a vital water resource for central Spain and Portugal. The Tagus River supports diverse aquatic ecosystems and provides water for agriculture, industry, and drinking water. The plant's treatment helps maintain water quality in this sensitive basin, reducing nutrient loads and pollutants that could otherwise impact downstream habitats and the Atlantic estuary.