ASTEPE Wastewater Treatment Plant, Amorebieta-Etxano, Euskadi, Spain

ASTEPE is a wastewater treatment plant located in Amorebieta-Etxano, a town in the Basque Country (Euskadi), Spain. The facility serves a population of approximately 23,075 people, classifying it as a medium agglomeration under EU standards. Its designed capacity is 1.00 m³/s, indicating the scale of treatment operations. As a Spanish plant, ASTEPE operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are sensitive areas, such as those prone to eutrophication. Compliance with the directive ensures a minimum level of treatment. The plant's treated effluent likely discharges into local watercourses that drain into the Nervión River basin, eventually reaching the Bay of Biscay (Atlantic Ocean). The Basque Country's rivers support diverse aquatic life and are important for regional ecology. Proper treatment at ASTEPE helps protect downstream water quality and marine ecosystems.

ASTEPE's treated wastewater likely flows into the Ibaizabal or Nervión River system, which drains into the Bay of Biscay. This coastal area supports diverse marine life and is ecologically sensitive. The plant's operation helps reduce nutrient and pollutant loads, protecting the riverine and marine environments from eutrophication and contamination.