In the vast majority of Western, Northern, and Central European countries (such as the UK, Germany, France, Switzerland, and Scandinavia), the tap water is not only safe but often of higher quality and more strictly regulated than bottled water. In 2026, European Union "Drinking Water Directives" ensure that municipal supplies meet rigorous safety standards for minerals and bacteria. However, travelers should exercise caution in parts of Eastern Europe (like some rural areas of Romania or Bulgaria) and on many Mediterranean islands (such as the Greek Cyclades or parts of Cyprus). While the water in these island locations might be "bacteriologically safe," it is often desalinated or contains high mineral content that can cause gastrointestinal upset for those not accustomed to it. A "pro-tip" for 2026 is to look for public "water refill" apps like Refill My Bottle, which map out thousands of free, high-quality tap water stations. If you are in a historic city like Rome, the "Nasoni" fountains provide ice-cold, delicious spring water for free, making the purchase of plastic bottled water both environmentally and financially unnecessary.