This is not true for all countries.
for example the netherlands where all tap water is:
Fluoride free
Lead free
Bleach free
Nitrate free
PH between 7 and 9.5
"The sources used for tap water are better of quality and are better protected by law than the sources used for bottled water."
But then again if you are living in the US you have way worse food practices to worry about.
Ractopamine, over use of Antibiotics, chlorine washed poultry, Arsenic in chicken, turkey and pig food, Atrazine
just to name a few
xD