Montiel Santa Cruz de los Canamos Wastewater Treatment Plant, Montiel, Spain

The Montiel Santa Cruz de los Canamos wastewater treatment plant is located in Montiel, a municipality in the province of Ciudad Real, within the autonomous community of Castilla-La Mancha, Spain. The plant serves a population of around 6,142, 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 typically includes nutrient removal (nitrogen and phosphorus) and disinfection, ensuring high-quality effluent before discharge. The treated water is discharged into the local hydrological network, which ultimately drains into the Guadiana River basin. The Guadiana River flows westward through central Spain and Portugal before emptying into the Gulf of Cadiz (Atlantic Ocean). The advanced treatment helps protect the sensitive aquatic ecosystems of the Guadiana basin, which support diverse wildlife and agricultural activities.

The plant discharges into the Guadiana River basin, a major Iberian watershed that flows through the semi-arid La Mancha region. The Guadiana River and its tributaries sustain important wetlands, including the Tablas de Daimiel National Park, a vital stopover for migratory birds. Advanced treatment at this plant reduces nutrient loading, helping to prevent eutrophication and protect downstream aquatic habitats.