> Unless you are drinking a tap water (pretty extreme thing to do!)

Around your parts you do not drink tap water?

My understanding is that the amount of chlorine added to the tap water differs between regions. I read it can be a lot in the US.

Here in Germany there is a limit by law of 0.3mg per liter and most districts use between 0.03mg and 0.05mg per liter.

We drink tap water daily. There is no noticeable chlorine smell but I heard from friends their cat seems to not like it and drinks rainwater only.

I live in Australia, I would say most people would drink tap water at home. We have a sink top filter that filters water, so we use that. I don’t think drinking tap water in this part of the world is abnormal, on the contrary. Out of curiosity, where are you from?