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Copper Pinhole Leaks: Why They Happen and What to Do

A pinhole leak is a tiny hole in a copper pipe, often from corrosion that started on the inside. Under a slab, you may not see it until the bill or the floor tells you.

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By Pomona Slab Leak Pros · Updated November 2026

What causes pinholes

Technician using electronic leak detection equipment on a home floor

Several factors can combine: water chemistry, flow velocity, pressure, the age of the pipe and installation. No single factor explains every leak, and we cannot say which one affected your pipe without inspection. See the causes of slab leaks and Pomona water and your pipes.

Warning signs

  • Sound of running water with fixtures off
  • Rising water bills
  • Warm spot on the floor
  • Low water pressure
  • Damp areas or a musty smell

See how to tell if you have a slab leak.

Repair choices

Repeat leaks

If one pinhole has appeared in old copper, others may follow. Ask your plumber to assess the rest of the system. That is the main reason people consider a repipe.

Frequently asked questions

Are pinhole leaks covered by insurance?

Coverage depends on the policy, and the pipe itself is often excluded. See slab leak insurance coverage.

Can a pinhole leak be patched?

A pipe section can be repaired, but a patch does not fix the corrosion elsewhere.

Does PEX get pinholes?

PEX does not corrode the way copper does, but it can fail in other ways. See PEX vs copper for a repipe.

How long does copper last?

It varies with water, installation and conditions. We do not give a fixed lifespan.

Causes of slab leaksAll the common causes.PEX vs copperChoosing a material for a repipe.Whole-house repipeWhen to replace everything.

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

More on slab leaks

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