1. A warm (or wet) spot on the floor.
If part of your floor is randomly warm underfoot — especially on tile or concrete — that's often a hot-water slab leak heating the surface above it. A cool, damp, or discolored patch points to a cold-line leak. Either way, your floor shouldn't have mystery temperature zones.
2. Your water bill jumped for no reason.
Same number of people, same habits, but the bill climbs? Water is escaping somewhere you can't see. A slab leak runs 24/7, so it shows up on the meter fast. Compare this month to the same month last year — a sudden spike with no explanation is a red flag.
3. You hear running water with everything off.
Turn off every faucet and appliance, then stand quietly in the house. If you hear a faint hiss or trickle, you may be hearing water moving through a broken line under the slab.
4. Low water pressure all of a sudden.
When a supply line under the slab cracks, pressure drops because water is bleeding off before it reaches your fixtures. If your once-strong shower has gone weak across the whole house, don't ignore it.
5. Cracks, warping, or a musty smell.
Water under the slab has to go somewhere. Over time it shows up as hairline cracks in tile or drywall, warping in wood floors, discolored grout, or a persistent musty/mildew smell near baseboards.
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