Slab Leak Repair in El Monte — Same-Day, 24-Hour Service Near You

What Is a Slab Leak

When the Leak Is Under Your Foundation

A slab leak happens when a water pipe running under or through your home's concrete foundation cracks, corrodes, or shifts. Because the pipe is buried under the slab, you cannot see the leak directly, but the water slowly soaks into the soil below your floor, sometimes for weeks before any sign appears on the surface.

Common causes include pipe corrosion from chemical reactions in the water, soil movement that shifts and bends pipes over time, friction against the concrete itself, and high water pressure that wears pipes down faster than normal. Copper pipes in particular can corrode in acidic or mineral-heavy water over many years.

Repair Options: Spot Repair vs Repiping

Once we locate the leak, you generally have two paths. A spot repair targets just the damaged section, breaking through a small area of concrete to access and fix that one spot. This works well for a single, recent leak in an otherwise healthy pipe system. Repiping, sometimes called rerouting, replaces the problem pipe entirely, often running new lines through walls or the attic instead of back under the slab. This costs more upfront but removes the risk of a repeat slab leak from the same aging pipe system. We will walk you through both options honestly based on what we find.