ESTELLA Wastewater Treatment Plant, Estella-Lizarra, Navarra, Spain

The ESTELLA wastewater treatment plant is located in Estella-Lizarra, in the province of Navarra, Spain. It serves a population equivalent of 54,420, classifying it as a medium-to-large agglomeration under EU regulations. The plant is situated inland, approximately 50 km from the coast, and discharges into the local river system. As a plant in Spain, ESTELLA operates under the EU Urban Waste Water Treatment Directive 91/271/EEC. For agglomerations with a population equivalent between 10,000 and 150,000, the directive requires secondary treatment as a minimum. In sensitive areas, more stringent treatment may be necessary. It is expected to meet these regulatory standards. The treated effluent from ESTELLA likely discharges into the Ega River, a tributary of the Ebro River, which flows into the Mediterranean Sea. The Ebro basin supports diverse aquatic life and is an important agricultural and ecological corridor in northeastern Spain. The plant's operation helps protect downstream water quality and the ecological health of the Ebro River system.

The ESTELLA plant discharges into the Ega River, a tributary of the Ebro River, which ultimately flows into the Mediterranean Sea. The Ebro basin is a vital ecological corridor supporting diverse aquatic species and migratory birds. The plant's treatment helps maintain water quality in this sensitive river system, which is also used for irrigation and recreation downstream.