Tap water has needed to be `cleaned` and lots of chemicals are added to make potable drinking water, not forgetting that much water is recycled and it also contains medications and other nasties.
Personally, I have filtered water for over 50 years, having actually physically been present when sacks of chemicals were added at a water treatment plant. These chemicals have increased over the years with the increasing population, industrial run-off etc
I started with the simple cheap filters in jugs, then when onto the zero brand and now always use an aarke water purifier, which is neat for standing on my countertop. No need for plastic bottles or filters these days
My tap water here in somerset is soft and tasteless but no tap water is for me