Matarrosa del Sil Wastewater Treatment Plant, Toreno, Castilla y León

Matarrosa del Sil is a wastewater treatment plant located in the village of Matarrosa del Sil, within the municipality of Toreno, in the El Bierzo region of León, Castilla y León, Spain. The plant serves a population of approximately 2,500 people and is part of the regional wastewater infrastructure managed under Spanish and European regulations. The plant operates with secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The designed capacity of 2,500 m³/day matches the population served, indicating adequate sizing for the community's needs. The treated effluent is discharged into the local watershed, which ultimately drains into the Sil River, a tributary of the Miño River. The Miño flows into the Atlantic Ocean at the border between Spain and Portugal. The plant plays a key role in protecting the Sil River basin from untreated wastewater, supporting aquatic life and downstream water quality.

The plant discharges into the Sil River basin, which flows through the El Bierzo region before joining the Miño River. The Miño River is one of the longest rivers in the Iberian Peninsula and supports diverse aquatic ecosystems, including migratory fish species. The plant's secondary treatment helps reduce nutrient and organic pollution, protecting the river's ecological health and downstream water uses.