said by guppy_fish:If a leak in a pipe is the cause it is going to be hard to find unless it is indoors where damage is easily visible. A 1/16" hole over the period of month can lose 24333 gals. + or -. If it is deep in the ground it could take quite some time to locate. That is assuming a line pressure of 60 psi.
Check your irrigation timer, probably running daily and the most common reason for high water bills or a busted pipe in the irrigation. Leaking main copper from the meter to the home is another common occurrence in FL