Tap water in Croatia is completely safe to drink and is of exceptionally high quality across almost the entire country. Croatia’s water supply primarily comes from underground springs and aquifers, which are strictly monitored according to both national and stringent European Union drinking water standards. In major cities like Zagreb, Split, and Dubrovnik, the water is clear, tastes good, and is perfectly fine for drinking, cooking, and brushing your teeth. Some travelers may notice a slight "mineral" or chlorine taste in certain coastal areas, but this does not indicate any safety issue. On some of the smaller, more remote islands, the water supply might be supplemented by tankers or local cisterns during the peak summer months; in these rare instances, you might see a local advisory or prefer bottled water for taste, but for 99% of a standard tourist itinerary, you can confidently refill your reusable bottle from the tap. In fact, many Croatian cities feature historic public fountains (like the Onofrio’s Fountain in Dubrovnik) where the water is fresh, cool, and free for all to enjoy.