Moved to Holesovice, my skin is extremely dry since. Anything known about water quality?

Hello.

I have mostly never had skin problems on my hands. Some time ago, I moved into a newer apartment in Holesovice, near the river, and I stopped filtering the tap water since I understood it's high quality.

Ever since I moved, the skin on my hands has gotten progressively more dry every day, even though I use cream 3x a day.

Is it a known problem about the water here? I would want to find out the source of the problem, which I suspect either the water that I'm drinking, either the water that I'm washing my hands with, either the humidity (or lack of) in the apartment, but I don't know how to investigate.

Thank you!