Miguel Esteban Wastewater Treatment Plant | Secondary Treatment, Tagus Basin

The Miguel Esteban wastewater treatment plant is located in the town of Miguel Esteban, in the province of Toledo, Castilla-La Mancha, Spain. It serves a population of approximately 5,839 residents, making it a small-scale municipal facility. The plant is situated inland, far from coastal areas, and its operations are part of the region's water management infrastructure. As a secondary treatment facility, the plant meets the standard requirements under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary biological treatment for agglomerations of this size. The plant processes an average daily discharge volume of 728.40 cubic meters, reflecting the wastewater generated by the local community. Secondary treatment typically involves biological oxidation and sedimentation to reduce organic matter and suspended solids. The treated effluent is discharged into local watercourses that eventually 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 plant's operations contribute to protecting the ecological health of the receiving waters and downstream environments.

The plant discharges into the Tagus River basin, which flows through central Spain and Portugal before reaching the Atlantic Ocean. The Tagus River supports diverse aquatic life and is an important water resource for agriculture and urban areas. The region's semi-arid climate means that maintaining water quality in the river is critical for both ecological balance and human use. The plant's secondary treatment helps reduce nutrient loads and organic pollution, mitigating eutrophication risks in downstream reservoirs and estuaries.