Tap water is always available for free at restaurants and cafes around Spain and you often don't even need to ask for it, they will simply bring it over to you with menus.
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A question often asked by foreign visitors when they come to Spain is “Is it okay to drink the tap water here?” The simple answer is yes, you can! Spanish tap water is considered to be 99.5% safe to drink, although the taste may vary somewhat according to the region.
Ireland is one of only two countries in the world (Turkmenistan is the other) that provide free water to residents, according to Global Water Intelligence, a British research outfit.
The Water Law is the legal framework for water management in Spain. Legal amendments to the Water Law introduced in 2004 and 2005 transposed the requirements of the WFD and launched the development of River Basin Management Plans (RBMPs) in each of the 25 river basin districts.
In some places you can ask for tap water (for free) but it's not the custom in barcelona so you can get strange faces or negative answers. Agua del grifo, un vaso o una jarra (glass or jug). Dont ask for a bottle. What happens in Barcelona is that the water, although perfectly fine, doesn't have the best taste.
Tipping in Spain works differently: The customer actually has the option to not leave any tip at all. However, restaurants expect a 10% tip on each bill—although it's not a formal rule, and that percentage is much lower than tipping practices in other countries.
This is how to order a glass or bottle of water in Spain. “Por favor, ¿puede traerme una jarra de agua del grifo?” – Please can you bring me a jug of tap water?
Can You Drink Tap Water in Spanish Restaurants? According to a new law passed in Spain in April 2022, all restaurants and bars in Spain are obliged to provide free tap water to their patrons. This law was created to reduce the consumption of bottled water and subsequent plastic pollution.
Tap water is safe to drink in Barcelona. Water from the tap and tap water is drinkable in Barcelona and tap water in Barcelona is safe for cooking too. Barcelona tap water has low levels of chlorine to prevent contamination, but is completely safe for drinking and safe for cooking.