MARKINA Wastewater Treatment Plant, Markina-Xemein, Basque Country, Spain

The MARKINA wastewater treatment plant is located in Markina-Xemein, in the Basque Country (Euskadi), Spain. It serves a population of approximately 6,789 people, classifying it as a small to medium agglomeration under European Union classification. As a Spanish wastewater facility, MARKINA operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size discharging into freshwater or estuaries. The plant's proximity to the coast (within 50 km) may subject it to additional requirements if the receiving waters are considered sensitive areas under the directive. The plant's treated effluent likely discharges into local rivers that flow into the Bay of Biscay, part of the Atlantic Ocean. The Basque Country's coastal rivers support diverse aquatic ecosystems, including migratory fish species such as salmon and eels. Proper treatment is essential to protect these habitats and maintain water quality in the region's estuaries and coastal waters.

The MARKINA plant is situated in the Basque Country, a region with steep, fast-flowing rivers that drain into the Bay of Biscay. The nearest major river is the Artibai, which flows through Markina-Xemein and eventually reaches the Cantabrian Sea. This coastal area supports important marine and estuarine habitats, including seagrass beds and spawning grounds for commercial fish species. The plant's discharge must comply with EU standards to prevent nutrient enrichment and protect the sensitive coastal environment.