Domestic and hotel tap water supplies in Mallorca are safe to drink but, because the sources of water are usually in concentrations of limestone, the water is inclined to be hard, and may have a mineral taste. It may also be quite heavily chlorinated in some areas.

Yes, the tap water in Palma de Mallorca is officially safe to drink and meets all European Union health and safety standards. However, while it is potably "safe," many locals and tourists choose not to drink it because it has a very high mineral content (hard water) and a strong taste of chlorine. The water on the island often comes from desalinated sea water or limestone aquifers, giving it a slightly "salty" or metallic aftertaste that can be unpleasant for those used to softer water. Because of this, bottled water is extremely cheap and widely available in local supermarkets like Mercadona. If you want to avoid plastic waste, a high-quality filter bottle (like a Brita or LifeStraw) is an excellent compromise for your stay in Palma, as it will remove the chemical taste while allowing you to benefit from the safely treated municipal supply. Note that in some very remote or rural parts of the island, "non-potable" signs may still exist near older wells, but in the city of Palma itself, the water is strictly monitored and perfectly fine for brushing teeth and showering.