If you're controller is old, replace it. My house had an old Rainbird controller until I replaced it with a Rachio in January. Last winter, while I was away, I was being billed for 1000's of gallons of water. The usage was going up monthly, although no changes were being made to the program. I had Village's Utilities check for leaks. When I arrived this January, I attempted to reprogram the controller. It was so old, it wasn't accepting what I was inputting. I couldn't even change the time. It had a mind of it's own! After I replaced it, my water usage went down 15,000 gallons---really.
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