CRISPIJANA Wastewater Treatment Plant, Vitoria-Gasteiz, Basque Country

CRISPIJANA is a major wastewater treatment plant located in Vitoria-Gasteiz, in the Basque Country (Euskadi), Spain. It serves a population equivalent of 366,681, classifying it as a large agglomeration under EU regulations. The plant is situated near the A-1 highway in the Estarrona area, within the province of Araba/Alava. As a large-scale facility, CRISPIJANA is expected to comply with the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment as a minimum, and tertiary treatment if the receiving waters are designated as sensitive areas. The plant's treatment processes are designed to meet these standards, ensuring effective removal of organic matter and nutrients before discharge. The treated effluent from CRISPIJANA is discharged into the local water system, which ultimately drains into the Zadorra River, a tributary of the Ebro River. The Ebro River flows into the Mediterranean Sea, making the plant's performance critical for protecting downstream aquatic ecosystems and the marine environment. The plant plays a key role in maintaining water quality in the region.

CRISPIJANA discharges into the Zadorra River, which flows into the Ebro River and eventually reaches the Mediterranean Sea. The Ebro River basin supports diverse aquatic life and is an important ecological corridor. The plant's operations help protect downstream habitats from nutrient pollution and organic loading, contributing to the health of the Mediterranean coastal zone.