Slab Leak Repair
Slab leak repair fixes a failed water line beneath your concrete foundation. Options include breaking a small section of slab to reach the pipe, tunneling underneath, or rerouting a new line overhead through walls or attic. FlowFast connects you with an independent local plumber who can assess the leak's location and recommend the least disruptive approach.
- Connected with an independent local pro — never a call center queue.
- Part of our Leak Detection & Repair services — explained up front.
Parent service
Leak Detection & RepairHigh water bill or mystery damp spot? How pros find hidden leaks with acoustic and thermal tools, and how to get connected with an independent local plumber.
View all Leak Repair servicesOnce a slab leak is located, the repair choice depends on the pipe's material and age, the leak's exact position, and how much concrete sits between the plumber and the failure. A single accessible break might be fixed through a small slab opening, while an aging copper system with multiple weak points often points toward abandoning the underground line entirely and rerouting a new one overhead. Each path carries different trade-offs in disruption, timeline, and long-term reliability, which is why a confirmed detection report matters before anyone picks up a jackhammer.
Tunneling under the slab avoids breaking interior floors but takes longer and costs more in labor; rerouting overhead means no concrete work at all, though the new line runs through walls or the attic. A good plumber explains which option fits your home's layout and why, in plain terms. FlowFast Plumbing is a referral service — we connect you with an independent local plumber for the repair discussion, and you decide which approach to approve. Get the leak's location in writing, ask how each option affects your flooring and foundation, and take your time choosing.
Warning signs
Signs you need this service
- You already have a confirmed slab leak location from detection testing and now need the failed section of pipe repaired or replaced.
- Water pressure keeps dropping in one part of the house, or the water heater runs constantly to keep up with hot water escaping underground.
- Cracks are spreading in tile or concrete floors near the leak's location, suggesting soil beneath the slab is shifting as water escapes.
- Mold or mildew keeps returning along baseboards even after cleaning, fed by constant moisture wicking up from the slab leak below.
What to expect
The process, step by step
The pro reviews the detection report with you, confirms the leak's marked location, and discusses spot repair, tunneling, or rerouting options.
You approve an approach together. For a slab opening, the plumber protects nearby flooring and cuts a precise access point over the break.
The failed section is cut out and replaced, or the new line is run overhead. Joints are pressure-tested before anything is closed up.
The opening is patched, fixtures are run to confirm normal flow and pressure, and the pro walks you through what was changed.
Prevention
How to avoid this problem
- After a slab repair, ask about a pressure regulator if your home's water pressure runs high, since strain shortens pipe life.
- Watch your water bill after the fix. A flat, normal bill is the simplest confirmation that the repair is holding.
- If the system is old copper, schedule periodic checkups so the next weak point is found by testing, not by surprise damage.
Frequently asked questions
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Other leak detection & repair jobs homeowners ask about.
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