I still hear water running when I shut off the main water shut off valve
Finding pinhole leaks in poybutylene (a type of plastic) AND some copper piping that are water supplies from water meters to homes is very typical. The amounts of usage you have stated should have shown up like an oil geyser in Texas though. I know you've done testing, but do one more: See if you have a cut-off valve immediately after the water meter, the homeowner's side. IF SO, see if you can close this valve and feel confident that you have closed it. Make sure all other faucets within the home are closed. Now, make sure to close the stop valves on each toilet, if you can, this is a place where you may have a leak and let's temporarily eliminate it. open the closest outside faucet, let it run until it stops, or tries to stop. At this point you should be able to see two things: 1) If the meter is running at all whether it is the older analog (dials) type or the numerical type, water moving will move either one hand of the dials type or the rightmost number of the numerical type. 2) Watch the outside faucet, if there is water moving through the meter there will be water coming out of the faucet, water pressure no matter how small will move wate, provided all faucets/valves in the house are closed. This can be a tedious process but will work. Now-if you see the meter moving at all, and there is no water coming out of the faucet, chances are you have an undergroung leak between the meter and the home. IF SO, you should will have to find or imagine where the water line comes into the house, and look for a very wet spot in your lawn. As I stated, this is a tedious process but will work and I hope this will help you, David
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