Get more info. Look up historical water usage online at districtgov.org
You can query your address and see bills from the previous owner's account, and neighbors' usage too.
Can you (or a friend) turn them on and visually inspect for a broken head - dumping a lot of water in one place.
Are you in the newer area where irrigation is metered separately from potable (drinking) water?
What are the irrigation controller zone run times, and watering days?
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