Close the shutoff valve for that line, dry the pipe with a rag, and press a rubber-gasket repair clamp or epoxy putty over the hole. That stops the spray for now. It does not fix the reason the pipe failed, because pinholes come from corrosion on the inside and usually mean more weak spots along the same run. For active bursts, see burst pipe plumber.
What is a pinhole leak, and why does copper get them?
Corrosion starts on the inside of the tube and works outward until a hole the size of a pin opens. Researchers studying copper pitting name three suspects that can act together: the chemistry of the water, contamination on the metal surface, and bacteria-driven corrosion. Fast flow and turbulence around fittings can add to it.
Pitting is local, so one spot fails while the rest of the pipe looks fine. Plumbers often see several pinholes appear over months in the same house, which is why the first leak deserves a closer look at the whole system. A pipe with a green crust, a blue-green stain or a white mineral streak may have a pin-sized leak behind it.
Is there a pipe leaking inside my wall?
Watch for a stain that keeps growing on a ceiling or wall, paint that blisters, drywall that feels soft, a musty odor, a trickling sound at night, or a meter dial that keeps turning with all fixtures off. Bursts flood quickly. Pinholes seep, so they hide for weeks.
The EPA's check takes two readings of your meter, two hours apart, with nothing running. If the numbers differ, water is escaping. Closing the house main then tells you where: a meter that stops points to a leak on your side. Pinpointing the spot inside a wall calls for listening gear, covered in what leak detection costs.
What can I use to stop a pinhole leak for now?
Turn the supply valve for that branch to closed, let a low tap drain the pipe, and wipe the copper dry. A rubber-lined clamp tightened over the hole works, as does two-part epoxy putty pressed in by hand and left for the cure time printed on its package. Reopen the valve gradually and watch the patch for a few minutes.
Self-fusing silicone tape and a padded hose clamp are two more stopgaps. Published lifespans for any of these run from days to years, so none should be trusted for long. Never bury a patch behind finished drywall. Should water be reaching outlets or the panel, throw the breaker only while standing somewhere dry, or stay out and phone for emergency help.
What is the lasting way to fix a pinhole in copper?
Remove the bad stretch of tube and put new material in its place. A plumber fits a soldered copper coupling or a push-to-connect fitting rated for potable water, after clearing and drying the pipe. Soldering a dab over a pinhole is sometimes done, but replacing the section is more reliable because the pipe wall around the hole is thin.
Soldering needs a torch, flux, lead-free solder and a pipe that is fully drained and dry, and a mistake near framing can start a fire. Many homeowners use push-fit fittings for small jobs, but old or oval pipe can seal poorly. If more than one pinhole has appeared, ask the plumber about replacing the run or repiping; see repipe a house.
Does Anaheim water cause pinhole leaks in copper?
One factor, perhaps, though nobody can prove it for every house. The City lists Anaheim water at about 18 grains per gallon, a very hard figure, and crusty deposits can set up the conditions for pitting beneath them. Water chemistry and disinfection matter as well, and lines carrying hot water are often the first to give out.
Homes built in the postwar years in Buena Park, La Habra and Placentia, and older houses in Anaheim, Fullerton and Orange, may carry copper that is several decades old. A plumber can judge condition by inspecting cut sections and fittings. Read hard water scale prevention for how scale forms.
How do I dry out a ceiling once the leak is fixed?
Repair the source, scoop out any pooled water, and cut open the wet section so air reaches the cavity. Pull soaked insulation and drywall, set fans and a dehumidifier running, and test until nothing feels damp. EPA guidance puts it simply: repair leaks quickly and dry everything thoroughly, since mold gains ground with every day of moisture.
Stained, sagging acoustic tiles that have grown mold usually go in the trash. Mold across more than roughly ten square feet, or a large soaking, is where the EPA points you to its remediation guidance. A ceiling bulging with water can drop without warning, so poke a small hole over a bucket and keep your head out from under it. More on ceiling water leaks.
How should I mend a leaking PVC joint?
Saw out the weeping joint and glue in a fresh coupling, using PVC primer and cement on clean, dry pipe, and let it cure before restoring water. A joint that weeps is not repaired by wrapping tape or adding more glue. Temporary fixes hold only briefly.
Bad glue work, a cracked fitting or pipe that shifted: those are the usual reasons PVC weeps. Supply lines made of plastic get their own treatment in plastic supply pipe leaks. Joints buried in a wall or slab are best left to a professional.
At what point does a pinhole leak need a professional?
Bring in help when the wet spot is behind a wall or ceiling, when you have found multiple pinholes, when the pipe runs through concrete, when the house main will not budge, or when water has reached anything electrical. A tradesperson can fix the hole, inspect the remainder of that line, and talk through repiping.
Pinholes behind finished surfaces are a job for the quote form: fill it in and we arrange a local visit around Anaheim and North Orange County. The Citrus Belt Plumbing home page maps the cities we cover. Expect a price on paper first. Cleanup of water damage is billed apart, and your insurer may weigh in.
Common questions
Can a pinhole be patched while the line is still live?
Not safely. Putty and clamps will not hold on a wet pipe under pressure, so the water has to be off and the pipe dry before you start. If the branch valve refuses to turn, close the house main and ring for help. A leak you cannot control is an emergency.
How long will a temporary clamp or epoxy last?
Published estimates vary from a few days to years, so there is no number to trust. The repair depends on pressure, pipe condition and installation. Plan on having a permanent repair done soon, and watch the spot for dampness each day until it is done.
Are pinhole leaks covered by insurance?
Policies differ. Insurers often pay for sudden water damage, while the pipe repair itself and slow seepage often are not. Before filing, read your policy, take photographs and keep every receipt. Our summary of burst pipe coverage lists the usual rules.
Should I replace all my copper pipes after one pinhole?
Not by reflex. A single pinhole in an otherwise healthy house can be patched. A cluster of them within months hints at corrosion throughout, and at that point repiping can undercut a string of repairs. An inspection will tell you which situation you are in.
What does a pinhole repair cost?
It hinges on access and leak count. A small fix on an exposed run costs much less than a pinhole behind finished tile that needs wall repair too. Get the figure after someone has looked. For how labor is charged, see hourly plumber rates.
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