VISO VILLARALTO Wastewater Treatment Plant, El Viso, Córdoba, Andalucía, Spain

VISO VILLARALTO is a wastewater treatment plant located in El Viso, a municipality in the province of Córdoba, within the autonomous community of Andalucía, Spain. The plant serves a population of approximately 3,219 people, classifying it as a small agglomeration under Spanish and EU regulations. The plant operates at the secondary treatment level, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into freshwater and estuaries from agglomerations of this size. The designed capacity is 4,000 m³/day, and the reported discharge volume is 583.44 m³/day, indicating operational capacity well within design limits. The treated effluent is discharged into the local watershed, which ultimately drains into the Guadalquivir River basin. The Guadalquivir River flows southwest through Andalucía and empties into the Gulf of Cádiz (Atlantic Ocean). The plant plays a key role in protecting the water quality of the Guadalquivir basin and the downstream coastal environment.

The plant discharges into the Guadalquivir River basin, which is the major river system of Andalucía, flowing through Córdoba and Seville before reaching the Atlantic Ocean at the Gulf of Cádiz. The Guadalquivir estuary supports diverse aquatic life, including migratory fish species such as the European eel and various waterbirds. The watershed is ecologically sensitive due to agricultural runoff and seasonal water scarcity, making effective wastewater treatment critical for maintaining water quality and ecosystem health.