you no doubt have checked the obvious like running toilets (some are very small and quiet ) or leaking faucets inside the house.
Do you have a pool? If yes does it have auto fill? If yes check it as they do get stuck from time to time and no way to find out until the big bill arrives.
Have you checked the outside spigots? The ones the builder puts in are terrible quality. We have had leaks develop in 2 of our 3 outside faucets.
When the water person comes, do try to be there. They are very helpful in helping one think of other "stuff" like the above. You can also verify for him that you have everything that flows water in the house turned off, so he can determine if the meter still runs with everything shut down.
Any contractors working at your house or nearby? They sometimes forget and leave water running.
And of course the ultimate four letter work L E A K some where in/under/to the slab your house sits upon. It happens more than we would like to think.
Electrical surges/lightning will also affect meter performance....not that often but it does happen. The water company will not acknowledge this problem. In past years we have had several neighbors with spiking water bills who did in fact recieve refunds for unexplained spiking, with an assignable storm occirance and more than one house hold.
Good luck.
btk
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