The sewage treatment plants in the Balearic Islands are increasingly under pressure due to population growth and tourism activity. This is the main warning in the annual report by the Balearic Islands Water Observatory, prepared by the Water Alliance based on data from the 80 treatment plants managed directly by the Balearic Agency for Water and Environmental Quality (Abaqua).

Nearly 100,000 residents of the Balearic Islands lived in 2025 in areas where drinking water was declared unfit at least at some point during the year. Specifically, this concerns 98,452 inhabitants, a figure that rises to 145,027 if people residing in the 22 areas considered "at risk" are added, meaning those with recurrent non-compliance that could eventually lead to a declaration of unfitness.