If you live south of 466a, the newest irrigation systems are equipped with a feature called "seasonable adjustment." It adjusts your watering times for each zone every day at midnight. Depending on the weather conditions, it will increase or decrease the watering times, regardless of how you had set it. This is distinct from the rain sensor. If this feature isn't set up properly it can increase watering times significantly. Check your box to see if you have this feature. If so, call the water district and have them come out to adjust it and explain it to you.
My niece owns a home in Collier and her water usage jumped to 18000 gallons from 4000 last month. Neighbors on her block were also affected.
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