Can you drink tap water Cascais?

The short answer is: yes, you can drink the tap water in Portugal, and there's no reason to boil it before doing so. The tap water in Portugal isn't as nice as tap water from other parts of the world (Ireland and Scotland, for example), but it's 98,83% safe to drink.



Yes, you can absolutely drink the tap water in Cascais, Portugal. The water quality in the Lisbon and Cascais regions is strictly regulated and meets all European Union safety standards. It is treated to be 100% safe for human consumption, though some visitors might notice a slight "mineral" or chlorinated taste compared to what they are used to at home. Many locals and expats use simple charcoal filters (like Brita) just to improve the flavor profile, but there are no health risks associated with drinking it straight. In fact, as of 2026, Portugal has made a significant push to reduce single-use plastic, and many restaurants in Cascais are now encouraged to offer "tap water" carafes to guests. Choosing tap over bottled water is a great way to be a sustainable traveler while enjoying the beautiful Atlantic coastline.

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