NAVALCAN PARRILLAS Wastewater Treatment Plant, Navalcán, Spain

NAVALCAN PARRILLAS is a wastewater treatment plant located in Navalcán, a municipality in the province of Toledo, within the autonomous community of Castilla-La Mancha, Spain. The plant serves a population of approximately 8,325 residents, placing it in the small to medium agglomeration category 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 inland agglomerations of this size. This level of treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant discharges 971.00 cubic meters of treated wastewater daily, reflecting its operational scale. The treated effluent is discharged into local watercourses that ultimately drain 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 advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the Tagus basin, which is used for irrigation, drinking water supply, and supports diverse freshwater habitats.

The plant discharges into the Tagus River basin, which drains into the Atlantic Ocean. The Tagus River is the longest river in the Iberian Peninsula and supports a variety of aquatic life, including endemic fish species. The advanced treatment level helps reduce nutrient loading, which is critical for preventing eutrophication in downstream reservoirs and the river's estuary.