If you have a Hunter Irrigation control unit in the Garage, it has 3 program controls and you need to make certain you check all 3 programs for when the irrigation system is scheduled to run ..and for how long. In the upper left hand corner of the screen there is a very small 1, 2, or 3 designating the program. People use these programs for certain days (program 1) they water the entire lawn, but then only the front sprinklers go on 2 days later (program 2), and the back sprinklers go on 4 days later (program 3).
This is the usual cause for un-expected watering bills unless you have a leak
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