Yes, the tap water in Sitges is officially safe to drink and complies with all strict European Union health standards. The municipal supply is regularly tested for bacteria and chemical contaminants, making it perfectly safe for brushing teeth, washing produce, and cooking. However, the "problem" for most visitors is the taste and mineral content. Because Sitges is a coastal town, the water has a high mineral concentration and is often heavily chlorinated to ensure safety, which gives it a distinct metallic or "salty" flavor that many find unpalatable. For this reason, while you won't get sick from drinking it, the vast majority of tourists and locals prefer to use bottled water for primary hydration or use a high-quality filter bottle. If you are staying in older buildings in the historic center, dated plumbing can also occasionally affect the water's clarity, though not its underlying safety.