Slab Leak Detection & Repair in Alexandria, VA
Electronic detection and repair for a supply line leaking under a concrete slab, without breaking up the whole floor to find it.
A slab leak is a supply line leak under a home's concrete foundation, and it's one of the more unsettling calls a homeowner makes, since the first sign is often a warm spot on the floor or an unexplained water bill with no visible source at all. Electronic detection finds the exact location before any concrete gets broken up.
What a Slab Leak Actually Feels Like
Most people don't know to call it a slab leak, they notice a warm patch on the floor, a hissing sound from underneath, or a water bill that's climbed for no obvious reason. Those symptoms together are the clearest sign of a leaking hot or cold supply line running beneath the concrete foundation.
Local CauseWhy Slab Leaks Happen in Alexandria
Copper supply lines under a slab can develop pinhole leaks from soil chemistry reacting with the pipe over decades, and homes near the Potomac with a history of minor foundation settling see additional stress on these under-slab lines from ground movement. Older homes with original under-slab plumbing from before modern protective sleeving was standard are more prone to this than newer construction.
Signs to Watch ForSigns of a Slab Leak
Warm Spot on the Floor
A noticeably warm patch on flooring, especially over a slab, usually means a hot water line is leaking underneath.
Sound of Running Water
A hissing or running water sound with no fixture in use is a common sign of a slab leak.
Unexplained High Water Bill
A slab leak can run continuously, showing up first as a spike in the water bill before any visible sign appears.
Cracks in Flooring or Walls
Water undermining a slab over time can eventually cause visible cracking in flooring or nearby walls.
Notice a Warm Spot on Your Floor?
Electronic detection finds the exact leak location before any concrete is touched.
How Slab Leak Detection Works
The technician uses acoustic listening equipment and thermal imaging to trace the leak's location through the slab, narrowing the search to a small, specific area rather than an exploratory search across the entire floor. Once located, access is limited to that confirmed spot for the repair.
Repair OptionsRepair Approaches
Spot Repair
- Access limited to leak location
- Faster, lower cost
- Best for a single, isolated leak
- Most common outcome
Reroute
- Bypasses the slab section entirely
- Avoids repeated slab access if more leaks develop
- Recommended for older, leak-prone lines
- Slightly higher cost, more durable
What This Typically Costs
Exact quote after inspection, before any work begins.
Slab leak repair is sometimes covered by homeowner's insurance for the plumbing repair itself, with slab and flooring restoration coverage varying by policy. Confirm your specific terms.
Before You CallWhat to Note Before You Call
Walk the home barefoot to feel for any unusually warm patches on the floor.
In a quiet room with fixtures off, listen for any hissing or running water sound from the floor.
Common Questions
No, electronic detection narrows the leak to a specific, small area, so access is limited to that spot rather than the entire slab.
The line runs beneath the concrete foundation rather than through an accessible wall, which requires detection equipment and slab access to repair rather than a standard wall opening.
For an isolated leak in an otherwise sound line, a spot repair is usually sufficient. For an older line showing signs of broader corrosion, rerouting avoids needing to reopen the slab again later.
Often Paired With This Job
A confirmed leak location that turns out to be outside the slab area is handled under standard leak detection instead.
If the leak has been running long enough to cause visible flooring or wall damage, water damage restoration addresses that separately.
Also Serving
Warm Spot on Your Floor?
Electronic detection finds the exact leak location fast.
☎ Call (703) 912-0567