PUEBLA DE SANABRIA Wastewater Treatment Plant, Puebla de Sanabria, Spain

The PUEBLA DE SANABRIA wastewater treatment plant is located in the town of Puebla de Sanabria, in the province of Zamora, Castilla y León, Spain. It serves a population of approximately 6,100 residents, making it a small agglomeration under EU classification. The plant provides advanced treatment, which goes 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 6,100 population equivalents, and the average daily discharge volume is 356.16 cubic meters. The treated effluent is discharged into the local watershed, which ultimately drains into the Tera River, a tributary of the Esla River, which flows into the Duero River and then into the Atlantic Ocean near Porto, Portugal. The plant plays a key role in protecting the water quality of the Tera River and downstream ecosystems.

The plant discharges into the Tera River basin, which flows into the Esla River, a major tributary of the Duero River. The Duero River drains into the Atlantic Ocean at the Portuguese coast. The watershed supports diverse aquatic life and is important for regional biodiversity. Advanced treatment helps minimize nutrient loading and protects downstream water quality.