When you plan to be out of the house for a few hours, make sure you are not running the dishwasher or a load of laundry, check the meter reading before you go and when you return. Simple - no movement = no leak.
I did that and found one of the valves on the sprinkler system did not shut off all the way. A small leak can (and does) add up to a lot of gallons over time.
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