Slab leaks in Southwest Florida: what homeowners should know.

Most Southwest Florida homes sit on concrete slabs with copper water lines running beneath them. It's an efficient way to build — until a line develops a pinhole leak under six inches of concrete. Then you have a slab leak: water escaping where you can't see it, eroding soil, undermining the slab, and feeding mold, all while your water meter spins.

Why it happens here more than most places.

• Copper + concrete + time. Decades of thermal expansion and contraction wear thin spots in copper lines, especially at bends and where the pipe meets the slab.
• Shifting sandy soil. Our soil moves with wet and dry seasons. Movement stresses buried lines.
• Hard, mineral-heavy water. Aggressive water chemistry accelerates pitting corrosion from the inside.
• High water pressure. Excess pressure hammers every weak point in the system, including the lines under your floor.

Warning signs.

• A water bill that climbs with no change in usage.
• The sound of running water when every fixture is off.
• Warm spots on tile or wood floors (a hot-water line leak).
• Damp carpet edges, musty smells, or mold that keeps returning.
• Cracks in tile or the slab itself, or soil erosion visible at the foundation edge.
• Your water meter moves during a one-hour no-use test.

How detection works.

A plumber first confirms it's actually a slab leak — isolating hot vs. cold lines with pressure tests and checking the meter. Then acoustic listening equipment (essentially a medical-grade stethoscope for pipes), thermal imaging, and moisture meters pinpoint the leak within inches. No exploratory jackhammering. The whole point of modern leak detection is a surgical repair, not demolition.

Repair options.

• Spot repair — open the slab at the leak, fix the section, patch the concrete. Right when the rest of the line is healthy.
• Reroute — abandon the under-slab line and run a new line overhead through walls or attic. Often smarter when the pipe is aging overall.
• Whole-home repipe — if leaks keep appearing, the system is telling you it's done. A repipe ends the cycle.

A trustworthy plumber lays out all three with honest tradeoffs instead of defaulting to the priciest. If a leak is suspected, don't wait — constant moisture under a slab only gets more expensive. Call the emergency line if water is actively surfacing.