First, stop the water
Do not start by looking for the leak. Start by shutting off the water at the main valve, which is usually near the meter or where the line enters the house. Turn it clockwise until it stops. A ball valve with a lever closes with a quarter turn.
Then open a faucet at the lowest point of the house to drain what remains in the pipes, and open one at the highest point to let air in. Draining the lines reduces the amount of water still pouring from the break.
If the break is near electrical outlets, a panel or a ceiling light, switch off power to that area at the breaker if you can do it safely. Water and electricity together are the greater danger.
Why copper pipes burst
Copper is tough, so a burst is usually a sign of an outside force. Freezing is the best-known cause. Water expands as it turns to ice, and the pressure builds in the section between the ice and a closed faucet. The pipe often fails at that point, not where the ice sits.
Other causes include corrosion from the inside, a bad solder joint that finally gives way, a nail or screw driven into a pipe during remodeling, and pressure spikes from a failed pressure reducing valve.
Knowing the cause matters. A freeze burst in an exterior wall points to insulation gaps. A pinhole leak in several places points to wider corrosion that a single patch will not solve.
| Cause | Typical sign | What to check next |
|---|---|---|
| Freezing | Split along the pipe after a cold snap | Insulation and air leaks in that wall or crawl space |
| Corrosion | Green or blue crust and pinholes | Other exposed pipe sections and water quality |
| Joint failure | Drip at a solder fitting | Fittings near the failed joint |
| Impact damage | A puncture or flattened section | Where recent work was done |
| Pressure surge | Burst with no freeze or corrosion | The pressure reducing valve and expansion tank |
Limit the damage while you wait
Once the water is off, the next task is cleanup. Standing water leads to mold in as little as a day or two, so move fast. Mop and towel up what you can, and use a wet vacuum if you have one.
Take photos of the damage before you move things, since they help if you file an insurance claim. Lift furniture off wet carpet, and run fans to move air through the room.
Cut off and bag any soaked insulation or drywall that is sagging. Wet drywall near a pipe can fall and hurt someone. If water is coming through a ceiling, poke a small hole to let it drain into a bucket rather than let it pool and collapse.
- Shut the main valve and drain the lines.
- Switch off power to affected circuits if it is safe to reach the panel.
- Photograph damage before cleanup.
- Remove standing water and run fans.
- Call your insurer and a plumber.
Temporary fixes that actually hold
A temporary repair is meant to get you through until a plumber arrives, not to last. A rubber and clamp patch, a push-fit sleeve designed for copper or an epoxy putty stick can slow or stop a small split. Always shut the water off first and dry the pipe before applying anything.
Push-fit couplers are popular because they need no flame. They slip over a clean, cut pipe end and grip with an internal collar. They work on straight sections where there is room to cut out the damaged piece.
Be honest about the limit of a patch. If the split is long, if the pipe is bulging near the break or if the section sits in a wall you cannot reach, the safest temporary fix is to leave the water off and call for help.
Burst pipe and water still running?
Shut the main, then call. A plumber can often be on the way the same day and will tell you how to protect the house until arrival.
What a lasting repair looks like
A proper repair cuts out the damaged section and replaces it with new copper and fittings. The new pieces are cleaned, fluxed and either soldered or joined with approved press fittings. Soldering needs a torch and a clear workspace, free of old insulation and anything that could catch fire.
After the joint is made, the plumber turns the water back on slowly and watches for drips. A burst usually means the pipe was stressed in more places than one, so a good plumber checks adjacent joints and nearby runs.
If walls or ceilings were opened, that is the time to insulate the line, reroute it away from the cold side or add a shutoff valve so the next problem is easy to contain.
Repair or repipe
One failed pipe does not mean you need a whole new system. But if you have had several leaks in the past few years, or if the copper is thin and pitted, repair after repair can cost more than a planned replacement.
A plumber can look at your pipe condition and tell you which way the numbers go. If you are weighing a bigger project, our repiping service page explains what it involves.
For a single burst on a sound system, the plain repair is the right answer. Do not let anyone talk you into a repipe on the strength of one failure alone.
Freezing pipes and Sandwich winters
Sandwich winters bring freezing nights and coastal wind. The Town of Sandwich Department of Public Works has a Winter Preparation page that covers storms, plowing and hydrants, but it does not give guidance on frozen household pipes, so that part is up to you and your plumber.
Sandwich is the oldest town on Cape Cod, founded in 1637, and many houses carry plumbing added in several different decades. Old additions, crawl spaces and exterior walls are the places where pipes tend to lose protection. About 83 percent of homes are year-round residences, but seasonal houses that sit empty in winter face a different risk.
If you leave a house for the cold months, shut off the water and drain the lines, or keep heat on and have someone check it. A burst pipe in an empty house can run for days before anyone sees it.
Sources: Town of Sandwich and the Cape Cod Chamber of Commerce.
Preventing the next burst
Insulate pipes in crawl spaces, garages and exterior walls. Seal air gaps where cold air reaches pipes, and let a trickle run from a faucet on the coldest nights if you have a pipe that has frozen before.
Know where your main shutoff is and test it once a year, because a valve that has never moved can seize. Teach everyone in the house how to use it.
If your home is in Bourne or Barnstable, see our Bourne plumber page and Barnstable plumber page for coverage areas and emergency service.
Frequently asked questions
A small split on an easy-to-reach straight section can be patched with a push-fit coupler or clamp as a temporary measure. Soldered repairs, pipes in walls and anything near gas or electric are best left to a licensed plumber.
Right away. Shut off the main valve, drain the lines and start drying the area. Mold can start within a day or two, and water spreads into floors and walls quickly.
Often it covers sudden damage from a burst, but policies differ, and some exclude neglect or certain freezing situations. Photograph everything and call your insurer early. Read your own policy for exact terms.
Freeze bursts often happen between the ice block and a closed faucet, where pressure builds, not at the ice itself. Pressure spikes and corrosion can also cause bursts with no freeze at all.
Look for wet drywall, stains, bubbling paint, a warm spot on the wall or the sound of running water when every fixture is off. A plumber can use detection tools to find the source before opening more wall than needed.
Call our 24/7 line at (508) 389-4045 for a plumber. If the water is coming from the street side of the meter, also reach the Sandwich Water District, which lists a 24-hour on-call number on its website.
Still have a question about your situation? The line is open around the clock.
Call (508) 389-4045Standards note: copper pipe repair follows the Uniform State Plumbing Code, 248 CMR 10.00. Verify any plumber through the Board of State Examiners of Plumbers and Gas Fitters.