How come with city water, they do not distill it before sending it to us.?

natural water supply has things in it that is not good for us. distilling the water lowers these toxins and minerals that are bad for our bodies. could it have anything to do with population control? well what is it then? chlorine is not good for us eather, but do to our water going through a buch of pipes that are old, i can see that the need for killing the bacteria in these pipes as a must do. but isn't crazy that we poison ourselves and lower our life spans and create much pain in our bodies, just for the purpose of getting what we want faster and cheaper. maybe our bodies will one day become immune to the toxins. and the mineral that cling to us and cause health problems, maybe our bodies will find a way to dispose of them properly. they say practice makes perfect and we do evolve continually. so if this is it that we suffer now, so manny generations down the road will not have problems in this area. but we have had this problem for thousands of years, maybe this will not work.....