Do not break concrete yourself
The leak location needs to be narrowed before invasive work begins.
Possible under-slab plumbing leak
Slab Leak Warning Signs in Hemet, California
Unexplained warm flooring, running-water sounds, higher water use, damp flooring, low pressure, or water near the foundation can point to a concealed leak, but proper diagnosis is needed.
What not to do
Do not ignore active moisture
Move belongings when safe and document visible damage.
Watch the meter safely
Turn fixtures off and note whether the meter still changes.
Shut water off for uncontrolled flow
Use the main shutoff only when accessible and safe.