LA CAVADA Wastewater Treatment Plant, Riotuerto, Cantabria, Spain

LA CAVADA wastewater treatment plant serves the municipality of Riotuerto in the Cantabria region of northern Spain. The plant is situated in the Barrio de Baldelazón area of La Cavada and provides secondary treatment for local wastewater. With a designed capacity of 1200 m³/day and an average discharge volume of 268.57 m³/day, it operates well below its maximum capacity. As a secondary treatment facility, LA CAVADA meets the minimum treatment requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The directive mandates secondary biological treatment for discharges into freshwater and estuaries, with more stringent tertiary treatment required for sensitive areas. The plant's compliance with these standards ensures adequate removal of organic matter and suspended solids. The treated effluent from LA CAVADA is discharged into the local water system, which ultimately drains into the Cantabrian Sea. This coastal discharge location necessitates careful management to protect marine water quality and the region's diverse aquatic ecosystems. The plant plays a key role in safeguarding the coastal environment of northern Spain from nutrient pollution and pathogen contamination.

LA CAVADA discharges treated wastewater into the local catchment that flows to the Cantabrian Sea, part of the Bay of Biscay. This coastal region supports important marine habitats, including seagrass meadows and fish spawning grounds. The plant's secondary treatment helps reduce organic load and suspended solids, protecting downstream water quality and the ecological health of the Cantabrian coastal zone.