You can get at least 450 gallons of L.A. tap water for the $1.35 you'd pay
for 20 ounces of Aquafina. Turn that around, and 20 ounces of L.A. tap water
costs about one-twentieth of a cent. Would you pay $5 for a gallon of gas in a
pretty container if you could get a plain-wrap gallon for half a penny? When it comes to water, that's pretty much what we do.
(The Atlanta Journal Constitution, 8/5/07)
In San Francisco, the municipal water comes from inside Yosemite National
Park. It's so good the EPA doesn't require San Francisco to filter it. If you bought and drank a bottle of Evian, you could refill that bottle once a day for 10 years, 5 months, and 21 days with San Francisco tap water before that water would cost $1.35. Put another way, if the water we use at home cost what even cheap bottled water costs, our monthly water bills would run $9,000.
(Message in a Bottle, Fast Company, July 2007)