Water still needs to be transported 167 miles from HH, during which it can pick up plenty of things, like lead, chromium 6, bacteria and all sorts of other fun stuff. Never mind it has likely sat in a local reservoir for some period of time and who knows what the condition of those things are.
Before it was chlorine and then apparently that wasn't enough, so they switched to chloramine. Then, they do shit like this, with some weird spin on it:
https://www.sfgate.com/bayarea/article/SF-s-pure-drinking-wa...
I had several fish tanks (one ~400 gallons) that I was caring for during that switch over. I tried to do filtration and additives and the fish were never the same, they all died. It just seems intuitive that adding something to water that kills fish almost instantly, couldn't be great for humans either.
Needless to say, I only drink RO water, put a filter on my whole house and in my shower. That probably isn't enough, but at least it is better than nothing.
https://www.epa.gov/dwreginfo/chloramines-drinking-water
https://19january2017snapshot.epa.gov/www3/region9/water/chl...