Turégano Wastewater Treatment Plant, Segovia, Castilla y León, Spain

The Turégano wastewater treatment plant is located in the municipality of Turégano, within the province of Segovia in the autonomous community of Castilla y León, Spain. The facility serves a population of approximately 3,339 residents, making it a small-scale municipal plant. It is situated inland, far from coastal areas, and its operations are integral to local water management. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 3,339 population equivalents, and the plant treats an average daily flow of 370 m³. This level of treatment ensures high-quality effluent suitable for discharge into sensitive environments. The treated effluent is discharged into a local watercourse, likely the Arroyo de Santa Ana, which flows into the Cega River and eventually into the Duero River basin. The Duero River drains into the Atlantic Ocean near Porto, Portugal. The advanced treatment helps protect the ecological health of these water bodies, supporting aquatic life and downstream water quality.

The plant discharges into the Arroyo de Santa Ana, a tributary of the Cega River, which is part of the Duero River basin. The Duero River flows westward through Spain and Portugal, emptying into the Atlantic Ocean. This watershed supports diverse aquatic ecosystems, including fish species such as barbel and trout, and provides irrigation water for agriculture. Advanced treatment at Turégano reduces nutrient loads, helping to prevent eutrophication in downstream reservoirs and coastal zones.