HUECAS RIELVES Wastewater Treatment Plant, Rielves, Castilla-La Mancha

HUECAS RIELVES is a wastewater treatment plant located in Rielves, a municipality in the province of Toledo, within the autonomous community of Castilla-La Mancha, Spain. The plant serves a population of 5,522, classifying it as a small agglomeration under Spanish and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. This level of treatment is often implemented in sensitive areas or where higher effluent quality is needed to protect receiving waters. The plant discharges 789.00 cubic meters of treated wastewater annually. The treated effluent from HUECAS RIELVES ultimately drains into the Tagus River basin, which flows westward through Spain and Portugal before reaching the Atlantic Ocean near Lisbon. The Tagus River is a vital water resource for the region, supporting agriculture, ecosystems, and human consumption. Advanced treatment helps minimize nutrient loading and protect downstream aquatic habitats.

The plant discharges into the Tagus River basin, which flows through central Spain and Portugal to the Atlantic Ocean. The Tagus River supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment reduces the risk of eutrophication and protects the ecological health of the river and its estuary.