i had a similar concern a few years ago. i called the water dept and they sent a man out. he hound my problem. i did not know my sprinkler controller had 3 program capability. a b and c. not knowing this, i must have programmed all three. my sprinklers were going off in the middle of the night almost every night. my bill wa going up about 100 dollars a month. he reset controller. problem fixed. was no charge.
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