Monte Boyal Casarrubios del Monte Wastewater Treatment Plant, Casarrubios del Monte, Spain

The Monte Boyal Casarrubios del Monte wastewater treatment plant is located in the industrial polygon of Monte Boyal, serving the municipality of Casarrubios del Monte in the province of Toledo, Castilla-La Mancha, Spain. The plant handles wastewater for a population equivalent of around 53,667, placing it in the medium-to-large agglomeration category under EU classification. As a Spanish facility, the plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more stringent treatment if the discharge enters sensitive areas, which are designated by member states. The plant's treatment processes are designed to meet these regulatory standards, ensuring compliance with national and European water quality objectives. The treated effluent is discharged into a local watercourse that eventually drains into the Tagus River basin, one of the most important river systems in the Iberian Peninsula. 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 the Tagus basin by reducing pollutant loads from urban and industrial sources.

The plant discharges into a tributary of the Tagus River, which flows through central Spain and Portugal before reaching the Atlantic Ocean. The Tagus basin supports diverse aquatic life and is an important water resource for agriculture and urban supply. Downstream ecosystems include riparian habitats and wetlands that rely on good water quality. The plant's treatment helps mitigate nutrient and organic pollution that could otherwise impact these sensitive environments.