I don’t have separate irrigation, but I imagine it has meter box? If so you should be able to cut irrigation off look see it meter still shows movement. If not you have no leaks from meter to shut off valve. Now with valve turn on watch meter reading see if the numbers are going up? If so you have leak from shut off valve out to yard some where? I would at least try to isolate it. I don’t know how the charge for irrigation water? Maybe their minimum charge whether use it or not?
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