Slab Leak Repair
A slab leak is a leaking water pipe under a concrete floor. Common signs are a higher water bill, warm spots on the floor and the sound of running water. Leak detection costs about $150–$600, and slab leak repair averages around $2,280, with most homeowners paying $630–$4,400.
Last reviewed September 2026
Troubleshoot it now
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Does the water meter move with all taps off?
Turn off every tap and appliance and watch the meter. If it moves, water is escaping.
Signs it's this problem
- Water bill rising with no change in use
- Warm or hot spots on the floor (hot water line)
- Sound of running water when everything is off
- Damp carpet, warped flooring or new cracks in the slab
Why it happens
Water lines run under many slab-foundation homes. Corrosion, abrasion against concrete, poor installation and ground movement can wear pinholes or cracks, and the leak stays hidden until water or heat shows up above it.
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Safety: Don't break concrete yourself; slabs can hide electrical, gas and post-tension cables.
Slab Leak Repair cost
| Job | Typical cost |
|---|---|
| Slab leak repair including detection (average about $2,280) | $630–$4,400 |
| Professional leak detection | $150–$600 |
| Reroute the water line | $1,500–$4,500 |
Got a quote? Check if it's fair
Typical professional price for this job: $630–$4,400
Common questions
How do I know if I have a slab leak?
The water meter test is the easiest check: with every fixture off, the meter shouldn't move. Warm floor spots, running water sounds and rising bills add to the evidence.
Is it better to repair or reroute a slab leak?
Spot repair is cheaper for a single leak in otherwise good pipe. Rerouting avoids breaking the floor and is often preferred when pipes are old or leaks have happened before.