DEIA Wastewater Treatment Plant, Deià, Balearic Islands

DEIA is a wastewater treatment plant located in Deià, a municipality on the island of Mallorca in the Balearic Islands, Spain. The plant serves a population of approximately 1,456 residents and is situated in the Serra de Tramuntana mountain range, a UNESCO World Heritage cultural landscape. It operates with advanced treatment technology, ensuring high-quality effluent before discharge. The plant has a designed capacity of 3,100 cubic meters per day and currently treats an average daily flow of 205.19 cubic meters, indicating ample reserve capacity. As a Spanish facility, it operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas like the Mediterranean coastal zone. The treated effluent is discharged into the local environment, likely reaching the Mediterranean Sea via small coastal streams. The Serra de Tramuntana region is ecologically sensitive, with diverse marine and terrestrial habitats. The plant's advanced treatment helps protect the coastal waters and supports the area's tourism-dependent economy.

DEIA discharges treated wastewater into the Mediterranean Sea via local streams in the Serra de Tramuntana region. The coastal waters support seagrass meadows and diverse marine life, making advanced treatment essential to prevent nutrient enrichment and protect the ecological balance of this popular tourist destination.