I don't know if it would be worth it, but you can apply for a one time reduction on your water bill for a leak. Also, if you live south of Rt 466, your bill should provide separate usage information for potable and irrigation water. If the water valves are shut off, then any leak would most likely be outside the house. Another possibility is that the valve is leaking as well as a toilet. Toilet leaks are sometimes difficult to detect because they can be intermittent.
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