Slab Leak Detection & Repair
in Fort Worth, TX

A slab leak is a water leak occurring in the pipes that run beneath your home's concrete slab foundation. These include hot and cold water supply lines and, in some cases, drain lines. Because the pipes are embedded in or below the concrete, the leak is not directly visible — it reveals itself through secondary symptoms like elevated water bills, warm floors, or moisture damage.

The most common indicators are: an unexplained spike in your water bill, a warm or hot spot on your floor (for hot-water line leaks), the sound of running water when all fixtures and appliances are off, damp or buckled flooring, and cracks in walls or floor tiles that follow a straight line. If you're seeing two or more of these, a pressure test is the right next step.

If you're seeing visible water damage, water on the floor, or rapidly worsening symptoms, shutting off the main water supply is the right move to prevent further damage while you wait for service. Your main shut-off valve is usually near the water meter or where the supply line enters the house. If you only have mild symptoms (elevated bill, faint sound of water), it's not always necessary to shut off immediately — but don't delay getting a professional assessment.

Professional slab leak detection uses a combination of methods. First, a hydrostatic pressure test confirms a leak exists and identifies which line is affected. Then, acoustic listening devices or electronic leak correlators are used to pinpoint the leak location — typically to within a foot or less. Only after the leak is confirmed and located does any concrete get disturbed. This sequence is what prevents unnecessary floor damage.

Several factors contribute to the high rate of slab leaks in the Fort Worth area: the Blackland Prairie clay soil that expands and contracts significantly with moisture changes, creating mechanical stress on under-slab pipes; aging copper plumbing in homes built from the 1950s through 1980s; hot-water line failures from thermal cycling (pipes expanding and contracting with temperature); and in some areas, mildly corrosive water conditions that accelerate copper pipe wear from the inside.

Costs vary considerably based on the repair method, leak location, and extent of work. A spot repair with direct concrete access can range from roughly $1,000–$3,500 depending on location and access difficulty. A pipe reroute — running a new line through walls or the attic — may cost $1,500–$4,000+ depending on the distance and complexity. Tunneling from the exterior ranges similarly. See our slab leak cost guide for a full breakdown of what affects pricing.

A slab leak reroute means running a completely new water supply line through the walls or attic space — bypassing the damaged under-slab pipe entirely. The old pipe is abandoned in place (still full of concrete/soil so it doesn't create a void). A reroute is often the preferred approach when: the system has a history of multiple leaks, the pipes are aging copper that is likely to fail again, the leak is in a location that's difficult to access through the slab, or when avoiding post-tension cable risk is a priority. It's also often a cleaner long-term solution than repeated spot repairs.

Yes, particularly with Fort Worth's expansive clay soils. A long-standing slab leak can saturate the soil in a localized area beneath the foundation. Because the surrounding soil may be drier, this creates differential moisture levels that cause the slab to shift unevenly — leading to visible cracks in walls, sticking doors, and floor levelness issues. In some cases, a slab leak is discovered during foundation repair consultations. If your foundation company suspects a plumbing leak, getting a hydrostatic pressure test first makes sense before foundation repair work begins.