Can a Slab Leak Damage Your Foundation?
A small, quick leak is unlikely to threaten a foundation. A leak that runs for a long time under a slab can saturate the soil and is worth taking seriously.
How water can affect the soil under a slab
A pressurized leak releases water into the soil under the concrete. Over time, wet soil can soften, wash away or swell, depending on the soil type. How much movement, if any, depends on the leak, the soil and how long it ran. We cannot tell you your foundation is damaged from a leak alone. A structural engineer can.
Warning signs
- New or widening cracks in walls, floors or the slab
- Doors and windows that start to stick
- Gaps between walls and ceilings or floors
- Uneven or sloping floors
- Pooling water near the house
These can have causes other than a leak. See how to tell if you have a slab leak.
What to do
- Confirm and fix the leak. See slab leak detection.
- Photograph cracks with a ruler and date, and check them again later.
- If you see growing cracks or sloping floors, ask a licensed structural engineer to evaluate. A plumber is not a substitute.
- Tell your insurer. See slab leak insurance coverage.
Pomona soil and earthquakes
Southern California ground moves. A crack can come from settling or seismic movement, not from a leak. See earthquakes and slab leaks.
Frequently asked questions
Will a slab leak make my house sink?
Not usually from a short leak. A long-running leak can affect soil. Have an engineer evaluate if you see movement.
Who can evaluate foundation damage?
A licensed structural engineer or foundation specialist. Plumbers locate and repair pipes.
Does insurance cover foundation damage from a leak?
It depends on the policy and the cause. Ask your insurer before work begins.
Should I fix the leak first?
Yes. Stopping the water is the first step, then evaluate any damage.
Keep reading
Need slab leak repair Pomona homeowners can book? See our slab leak repair Pomona page for how we work, or call (909) 415-2610.
Water running, or a warm spot on the floor?
Shut off the main if water is visible, then call. A Pomona plumber will tell you what to do next.
Call (909) 415-2610More on slab leaks
- Slab Leak Repair for Landlords and Property Managers in Pomona
- Slab Leak vs Sewer Line Leak: How to Tell the Difference
- Who Pays for a Slab Leak? Owner, Landlord, Tenant or HOA
- Copper Pinhole Leaks: Why They Happen and What to Do
- How to Prevent Slab Leaks: What Homeowners Can Do
- Browse the full slab leak guide
