Is tap water safe to drink in Istanbul? İSKİ's position and advice

In Istanbul, İSKİ, the water utility, says the water it distributes meets drinking-water standards, but most residents drink bottled or demijohn water, and it is better to do the same. The reason is the state of the pipes and tanks in buildings, which the utility does not control. This guide summarises the official position, what residents do and the simple steps to take at the hotel and while travelling. Information found in October 2026.

İSKİ's official position

According to İSKİ, water leaving the treatment plants and in the network is checked against the Turkish TS 266 standard for water intended for human consumption, chemically and bacteriologically, with regular analyses and published quality reports. İSKİ nonetheless points out that water can deteriorate inside buildings: corroded pipes and poorly maintained tanks, whose upkeep is the responsibility of the building's owners, not the utility.

In other words, the water is drinkable when it leaves the public network, but nobody can guarantee what comes out of the tap in your hotel or rental.

What residents do

Most Istanbulites do not drink tap water: they buy 19-litre demijohns delivered to the door, bottled water, or use a filter. The taste of the water and distrust of building tanks explain this habit.

Practical advice for a visitor

To drink, buy bottled water, sold everywhere in supermarkets, grocers and kiosks.
At the hotel, ask reception whether the tap water is filtered; otherwise drink bottled water.
If you have a delicate stomach, stick to bottled water for anything that goes in your mouth.

To estimate your everyday spending, see the Istanbul travel budget.

At a glance

Question	Answer
Is the network water compliant?	Yes according to İSKİ (TS 266 standard)
Why not drink it?	State of building pipes and tanks
What do residents drink?	Demijohn or bottled water, filters
What to do at the hotel?	Drink bottled water