I think it depends where in CHC you are. I know when we were pumping our own water when we lived kind of rural (out airport way), we had to get another pump put in. At that time we got a TDS reading and from Dads memory it was 0 or very very low
Theres always going to be arguements between people who use it and people who dont use it. I've also seen tanks run on tapwater which look outstanding, but the more I research, the more I see, that if you want absolute pristine conditions, then RO/DI is the easy option. I'm not saying it isn't possible with tap water, but there would be far more work involved.
At the moment, i'm happy with the Tap Water until I can afford an RO unit