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Epoxy Pipe Lining for Slab Leaks: How It Works and Where It Fits

Epoxy lining repairs a pipe from the inside, so the floor stays closed. It can work well on pipe that is corroded but intact, and it is the wrong choice for pipe that is split or failing.

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By Pomona Slab Leak Pros · Updated November 2026

What epoxy lining is

Technician holding a thermal camera over a tile floor to find a hidden leak

Epoxy lining, also called pipe coating, cleans the inside of a pipe and applies a thin layer of epoxy to seal pinholes and reinforce thin spots. It is one of four fixes covered on slab leak repair options.

How it works

  1. Inspect. The pipe is checked to see whether it is suitable, often with a camera.
  2. Isolate and drain the line from the rest of the system.
  3. Clean and dry the inside of the pipe.
  4. Coat. Epoxy is pushed through the pipe so it forms a lining.
  5. Cure and test. The lining cures, and the line is tested before water goes back on.

Where it fits

  • Pinhole leaks from internal corrosion
  • Several small leaks in the same line
  • Pipe that is still round and intact
  • Situations where opening the slab or walls is hard

Where it does not fit

  • Pipes that are split or cracked
  • Failing fittings or joints
  • Pipe in poor condition throughout
  • Leaks that need the pipe physically replaced

Inspection decides, so ask what was inspected and what it showed.

Questions to ask before you agree

  • Is the coating certified for drinking water (NSF/ANSI 61)?
  • What does the manufacturer warranty cover, and what does the contractor warranty cover?
  • How was the pipe inspected, and what did the inspection show?
  • What happens to the repair if a fitting fails later?
  • How long before the water can be turned back on?

If the answers point toward a different approach, compare a reroute or a whole-house repipe.

Frequently asked questions

Is epoxy lining permanent?

The lifespan depends on the pipe condition, the product and the installation. Ask for the manufacturer documentation and the warranty in writing.

Does epoxy lining need a permit?

Ask the City of Pomona Building and Safety Division and your plumber. See Pomona plumbing permits for what the City publishes.

Is it safe for drinking water?

Ask for proof the product is certified for drinking water use, such as NSF/ANSI 61.

Can it fix a leak at a joint?

Not always. A failing joint or fitting may need to be replaced, so ask how fittings are handled.

Repair optionsCompare all four ways to fix a slab leak.Copper pinhole leaksWhat causes them and how they are fixed.Whole-house repipeWhen replacement beats repair.

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) 415-2610

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