Can You Drink Tap Water in Athens?

Athens tap water is safe to drink and meets EU Drinking Water Directive standards throughout the city. Water supply is managed by EYDAP (Athens Water Supply and Sewerage Company — Eυδαπ), which draws from three primary sources: the Mornos reservoir in central Greece (the largest, connected to Athens via a 192-kilometre pipeline), the Marathon reservoir in the foothills northeast of Athens (the oldest, constructed during the 1920s and still in active use), and Lake Yliki in Boeotia. Water from all three sources undergoes treatment at EYDAP's facilities including coagulation, sedimentation, filtration, and chlorination before distribution through Athens' metropolitan network. The water consistently meets and often exceeds EU Drinking Water Directive parameters at the point of treatment.

Despite being safe, Athens tap water has a reputation among residents for a noticeable chlorine taste — a consequence of the chlorination levels applied across a large and complex distribution network serving approximately 4 million people across the Greater Athens metropolitan area. The chlorine treatment is necessary and effective, but the detectable chemical note it leaves is the primary reason why many Athenians — particularly in older central neighbourhoods — default to bottled water for daily consumption. In newer districts with more recently installed pipe infrastructure, the taste is generally milder. The water is safe throughout; the taste is the only practical consideration.

Visitors staying in central Athens — in the tourist-dense areas around the Acropolis, Monastiráki, Plaka, Syntagma, and Psyrri — will find safe tap water at all hotels, guesthouses, and restaurants. The Kolonaki, Pangrati, Exarchia, and Koukaki neighbourhoods, popular with longer-stay visitors and Airbnb guests, all draw from the same EYDAP network. The historic Plaka neighbourhood, directly beneath the Acropolis, has an older pipe network but the water remains safe to drink. Athens restaurants typically present bottled water as the default table option, but requesting nero apo ti vrysi (νερό από τη βρύση — tap water) is legally your right and increasingly accepted in casual dining venues throughout the city.

Athens experiences a hot, dry Mediterranean climate with peak summer temperatures regularly exceeding 38°C in July and August — among the highest of any European capital city. Adequate hydration is critically important during summer visits, and the combination of heat, extensive sightseeing on exposed archaeological sites such as the Acropolis, the Ancient Agora, and the Temple of Olympian Zeus, and the city's hilly terrain means water consumption needs are significantly higher than in cooler European cities. Whether using tap water, filtered water, or bottled water, maintaining hydration throughout any Athens summer visit is a genuine health priority.

For day trips from Athens to the Attica region — to Cape Sounion and the Temple of Poseidon, the archaeological sites of Delphi, Olympia, or Mycenae, or ferry departures to the Saronic Gulf islands of Aegina, Hydra, and Poros — tap water safety varies by location. On the Greek mainland, tap water quality is generally consistent with Athens' standard. On nearby islands, the same desalination and water quality concerns that affect Mykonos and Santorini apply. Always carry bottled water when travelling to smaller islands from Athens' Piraeus port.