Covaleda Wastewater Treatment Plant: Advanced Treatment in Castilla y León

The Covaleda wastewater treatment plant is located in the town of Covaleda, in the province of Soria, Castilla y León, Spain. It serves a population of 5,917 and provides advanced treatment, ensuring high-quality effluent before discharge. As an advanced treatment facility, Covaleda goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent standards under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, the directive requires secondary treatment, but advanced treatment is often implemented in sensitive areas or to protect high-value water bodies. The treated wastewater is discharged into the local watershed, which ultimately drains into the Duero River basin. The Duero River flows westward through Spain and Portugal, emptying into the Atlantic Ocean. The advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the region.

The Covaleda plant discharges into the Duero River basin, a major Iberian watershed that flows into the Atlantic Ocean. The Duero supports diverse aquatic life and is an important ecological corridor. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality and habitats in the basin.