Yes, you can safely drink the tap water in Cinque Terre. The water in the five villages (Riomaggiore, Manarola, Corniglia, Vernazza, and Monterosso) is high-quality, potable, and comes from mountain springs in the nearby Apennines. Throughout the villages, you will find historic stone fountains—known as nasoni—that provide a continuous flow of cold, fresh water for free. It is a common practice for locals and tourists alike to refill their reusable bottles at these points. While the mineral content (hardness) may differ from what you are used to at home, resulting in a slightly different taste, the water is strictly regulated under EU health standards and is perfectly safe for consumption.