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.

The tap water in Palma de Mallorca (and the rest of the island) is officially safe to drink and meets all EU health standards. However, while it is technically potable, most locals and tourists find the taste to be quite unpleasant. The water is extremely "hard," meaning it has a high mineral content (mostly calcium and magnesium) and is often heavily treated with chlorine to ensure safety, as much of the island's water comes from desalinated sea water or underground limestone aquifers. This results in a metallic or chemical aftertaste. For this reason, nearly everyone in Palma buys bottled water for drinking and making coffee, while using tap water for showering, brushing teeth, and cooking pasta. In 2026, many eco-conscious hotels and cafes have installed high-quality osmosis filtration systems to reduce plastic waste, offering "filtered" tap water that tastes much better. If you are staying in an older building, you should also be wary of old lead pipes, but in modern accommodations, the main "danger" is simply a bad-tasting glass of water.