Tap water in Greece is generally safe to drink, especially in major cities like Athens and Thessaloniki, where the water supply systems are modern, well- maintained, and meet strict European Union standards. The water undergoes rigorous testing and purification processes, making it comparable in quality to other major European cities. However, on some Greek islands and rural areas, the water might taste different due to local water sources or desalinated seawater, so people often prefer bottled water there. Overall, the tap water in urban areas of Greece is safe for both locals and tourists to drink.