Slab Leaks Explained: The Florida Problem Hiding Under Your Floor

The Signs, in the Order Homeowners Usually Notice Them

The water bill is often the first witness: a steady climb with no change in habits, because a pressurized line leaks around the clock. Next come the house's own clues — the sound of water running when every faucet is off, a spot on tile or wood that feels noticeably warm (a hot-water line leaking below), damp or musty areas with no spill to explain them, and cracks or heaving in flooring as saturated soil shifts under the slab.

Any one sign can have another explanation. Two or more together, especially with a rising bill, is the pattern that justifies a professional leak detection visit rather than a wait-and-see month — under-slab water does not stop on its own, and it undermines the soil the slab rests on.

• ▸Water bill climbing with no change in use
• ▸Running-water sound when all fixtures are off
• ▸A warm spot on the floor, or unexplained damp and musty areas
• ▸Flooring cracks, lifting, or new gaps at baseboards

The Meter Test You Can Do Tonight

Turn off every water-using fixture and appliance, including the ice maker, then read your water meter and note the low-flow indicator if your meter has one. Do not use any water for two hours, then read it again. If the meter moved, water is leaving the system somewhere — and if the house's visible plumbing is dry, under the slab moves to the top of the suspect list.

The meter test proves a leak exists; it cannot prove where. That distinction matters, because the old approach to slab leaks — breaking concrete on a hunch — is exactly what modern detection exists to prevent.

How Detection Pinpoints a Leak Under Concrete

Leak detection is a listening and measuring exercise. Technicians use acoustic equipment to hear pressurized water escaping through soil and concrete, thermal imaging to trace a hot-water line's path and find where its heat blooms abnormally, and pressure isolation tests to confirm which line is losing water before anyone marks the floor.

Done properly, the result is a marked spot — often within a small area — not a trench. Ask any provider, in advance, what their detection includes and what happens to the fee if the leak turns out to be elsewhere, such as in a wall or an irrigation line. Clear answers are part of the service you are buying.

The Repair Options, Honestly Compared

Once located, there are three broad paths. Spot repair opens the slab at the marked point and repairs that section of pipe — the least invasive option when the line is otherwise sound and accessible. Repiping or rerouting abandons the leaking under-slab run and routes a new line through walls or the attic — more work up front, but it ends the pattern when an older line has leaked before or is corroding in multiple places. In selected cases, trenchless lining approaches are discussed, though under-slab pressurized lines limit where they apply.

The right choice turns on the pipe's material and age, whether this is the first leak or the latest, and how much future disruption you are buying your way out of. A provider who recommends the largest job should be able to explain the evidence — multiple soft spots on the acoustic survey, a line at end of life — not just the preference.

Getting a Slab Leak Checked in Miami or Fort Lauderdale

Do the meter test tonight and write down both readings. Photograph any warm-spot, damp, or flooring changes with dates. Then get a detection visit scheduled — every week a pressurized leak runs is water paid for and soil washed from under the slab.

PlumbCove connects South Florida homeowners with independent local plumbing providers for leak detection. Request a local pro through our leak detection page, or call 786-741-7667. You hire the provider directly — we simply make the connection.