How much does tap water cost per gallon in California?

Answer 1

in 2005 1 acre foot of water cost about $900 which would probably mean it costs closer to $1000 in 2009.

1 acre foot = 325 851.429 US gallons

so $1000/325 851.429 = $ per gallon of water.

which comes to a very small amount.. like less than 0.0031 c per Gallon. :)