Great question — answering as the UphillTech team:
I asked my Turkish friends and here's what they had to say: although major cities do have water filtration plants and water is considered drinkable at the source, the quality of water pipes that supply it within a building or in specific localities might be suspect. You are, thus, better off not drinking tap water straight unless you're using it after boiling (or in foods/drinks where water is boiled in the process) or filtering.
Full answer by Ankur Banerjee: https://travel.stackexchange.com/a/453 (CC BY-SA 3.0).
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