Salt air, shifting sand and the humid climate all take a toll on copper and PEX lines buried decades ago. A slab leak wastes hundreds of gallons a day, softens the fill beneath your foundation, and turns a small crack into a costly structural repair if you wait. The good news: experienced local specialists use electronic listening devices and thermal imaging to pinpoint the leak without demolishing your floor.
Why slab leaks happen here
Coastal sand settles unevenly as the water table rises and falls with every storm and king tide. That movement flexes the slab just enough to stress rigid copper joints, especially at elbows and tees. Older homes often have galvanized steel supply lines that corrode from the inside out, and even newer PEX can kink during the pour if it wasn't secured properly.
Salt-laden groundwater accelerates corrosion, and homes near the Intracoastal see higher mineral content in their wells. Add Florida's hard water and you get pinhole leaks that start small and grow. Because the pipe is encased in concrete, a tiny drip becomes a slow flood with nowhere to go but into the sand below—or up through your grout lines.
Signs you may have a slab leak
Your water meter spinning when every faucet is off is the clearest red flag. Walk outside, check the dial, then wait ten minutes without using any water; if it moved, water is leaving the system somewhere.
Inside, feel for warm patches on tile or hardwood—hot-water slab leaks heat the floor above them. You might hear running water when the house is quiet, notice cracks appearing in baseboards or floor tile, or see your water bill jump without a matching increase in showers and laundry. Damp carpet, mildew smell near an interior wall, or a drop in water pressure all point to a hidden leak. The longer it runs, the more sand washes out from under the slab, creating voids that let the concrete shift and crack.
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How detection works
A slab-leak specialist will start by isolating sections of your plumbing—closing valves to narrow down which line is losing pressure. Electronic amplification listens for the hiss of water escaping under pressure; even a pinhole makes a distinct sound through concrete. Thermal cameras highlight temperature differences when a hot-water line is leaking, and tracer gas can be fed into the cold-water system to pinpoint the exact spot.
Once the location is marked on your floor, the pro explains your options: accessing the pipe through the slab (jack-hammering a small square), tunneling under from outside, or rerouting the line overhead through the attic to bypass the damaged section altogether. Most leaks are repaired in a day, with concrete patched and sealed so you're back to normal quickly.
What to do if you suspect a leak
Turn off water to the house at the main shut-off and watch your meter for fifteen minutes. If the dial keeps moving, the leak is between the meter and your slab, and you need a pro today. If the meter stops, turn the water back on, close every fixture inside, and check again—a moving meter now means the leak is under the slab or in a wall.
Document your water bills for the past few months and take photos of any floor cracks, damp spots or meter readings before you call. A local slab-leak specialist will walk you through detection over the phone, schedule an inspection, and explain what the testing will involve. The faster you act, the less water you waste and the smaller the repair.
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