Citation needed. Some choice quotes from Wikipedia[1]:
'The Environmental Protection Agency regulations for tap water are "actually stricter than the Food and Drug Administration regulations for bottled water."'
'A study of drinking water in Cincinnati, Ohio, discovered that bacterial counts in bottled water were often higher than those in tap water and fluoride concentration was inconsistent.'
[1] https://en.wikipedia.org/wiki/Bottled_water#Perceptions_abou...