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Pinhole Leaks in Copper Pipes: Why They Happen in Murrieta Homes

By the Murrieta Leak Pros team ·

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A pinhole leak is a tiny hole in a copper water pipe. It may only drip, but it runs all day under pressure and can soak a slab, wall or ceiling before you notice. Many Murrieta homes have copper supply lines, so pinhole leaks are a common call for us. If you suspect one, our water leak detection team can find it. Call (951) 299-3473.

What is a pinhole leak?

A pinhole leak is a very small hole that forms when copper pipe wears from the inside or outside over time. It often starts as a tiny spray or a slow drip. Because the line is under constant pressure, even a small hole can waste water steadily and cause hidden damage around the pipe.

Pinhole leaks often show up as damp spots, a small stain, a hissing sound in a wall or a slab leak under the floor.

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Water pipe exposed in a cut section of a concrete slab
Water pipe exposed in a cut section of a concrete slab

What causes pinhole leaks in copper pipes?

Common causes include water chemistry that slowly corrodes copper, hard water deposits, high water velocity or pressure, sharp turns and poorly finished joints that create turbulence, and outside contact with soil or concrete. Rubbing against framing or rebar can also wear a hole through the pipe wall.

Common causes and what they look like
CauseWhat you may notice
Internal corrosionLeaks in more than one spot over time
High pressure or velocityBanging pipes, leaks near elbows and fittings
Hard water depositsScale on fixtures, slower flow
Contact with concrete or rebarSlab leaks, often on hot lines
Poor joints from installLeaks at fittings, sometimes in newer homes

Why do Murrieta homes get pinhole leaks?

Many Murrieta homes have copper water lines under or inside a concrete slab. The area's hard water, clay-rich soil that swells and shrinks, and lines in contact with concrete all add stress to copper over the years. Hot water lines tend to wear faster, which is why many slab leaks are on the hot side.

We see this in established tracts such as Bear Creek, and in newer areas like Copper Canyon where a pipe can rub against rebar from day one. Read the signs of a slab leak if you notice warm spots on the floor.

Have a leak? Don’t wait for it to get worse.

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What are the warning signs of pinhole leaks?

Watch for a water bill that rises for no reason, small stains or bubbling paint, damp baseboards, a hissing sound inside a wall, warm spots on the floor, and a water meter that moves when all water is off. Blue-green stains on copper fittings can also point to corrosion.

  • A second leak after an earlier repair
  • Low pressure at more than one fixture
  • Musty smells in one room or closet
  • A water heater that runs more than usual

Try the 30-minute meter test in our high water bill guide.

Should I repair the leak or replace the pipe?

For a first pinhole leak in an accessible pipe, a spot repair is usually enough. If you have had two or more leaks, or the leaks are under the slab, a reroute or repipe often costs less over time than repeated repairs. A technician can check the pipe near the leak to help you decide.

Approx. repair costs (estimates for planning only)
RepairApprox. cost
Spot repair on an accessible pipe$300 to $1,500
Slab leak spot repair$1,500 to $5,000
Re-route a slab line through walls or attic$2,500 to $8,000
Whole-home repipe$4,500 to $15,000

See our leak repair services and the repair options guide.

Copper is not the only older pipe that wears out. If your home has gray plastic supply lines, this guide on why polybutylene pipes leak explains what to look for.

Can I prevent pinhole leaks?

You cannot fully prevent them, but you can lower the risk. Keep household water pressure in a normal range with a working pressure regulator, deal with hard water scale, fix banging pipes, and act on the first leak quickly. Regular checks of your water bill catch problems early.

If your home has had more than one leak, ask about slab leak detection on the other lines too, since the same conditions may affect them.

Frequently asked questions

Are pinhole leaks a sign more will follow?

Often, yes. If the cause is in the water or the pipe itself, other spots on the same line may be wearing too. That is why repeat leaks point toward a reroute or repipe.

Can I patch a pinhole leak myself?

A clamp can slow a visible leak for a short time, but it is not a lasting fix. Hidden leaks under slabs or in walls need detection and proper repair.

Do pinhole leaks only affect old homes?

No. Newer homes can get them too, often where a pipe touches concrete or rebar or where a joint was poorly made.

Is PEX better than copper?

PEX is a common choice for reroutes and repipes. The right material depends on the home and the job, and your technician can explain the options.

Prices are approximate estimates for planning. Your final price depends on your property and is confirmed before work begins.

Where can I get help with this in Murrieta?

Murrieta Leak Pros offers Leak Repair & Trenchless Pipe Repair, Slab Leak Detection, Water Leak Detection. We serve every Murrieta neighborhood:

We also serve Temecula, Menifee, Wildomar, Lake Elsinore, Winchester, French Valley, Canyon Lake, Hemet and Sun City. See all service areas →

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