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Leaks from plumbing underground is definitely a possibility. In some houses, the cold and hot water are run underground because it was EASIER.
In my area all our buildings are on slabs. We install our water under the slab, noit because it's easier but in case the system develops a leak where would you rather the leak went? Back into the ground or down from the attic onto your carpet and furniture. Having got that off my chest a pressure le4ak under the slab could be a real possibility. To check to see if you have a hidden leak first shut down everything in the house, no flush, no drinks of water, and if you are on a meter go out and check the little pointer in the gage. It should not move or creep. If it does you have a leak. If you're on a pump then check the pressure gage after the pump builds up to pressure and shuts off. The gage should not fall and the pump come back on. If so then you have a leak. Hope this helps and thank you for rating my reply, Tom