A faucet that has slowed to a trickle—or stopped flowing—during a cold snap may be warning you that a water pipe has frozen. The pipe might not have split, but pressure can build as ice forms, and a crack may only become obvious once the ice begins to melt. A careful response can limit damage; a torch or other open flame can turn a plumbing problem into a fire.
Start by checking more than one faucet. If water is flowing normally elsewhere, the problem may be limited to one fixture or branch of the plumbing. If several taps have lost water, or you can’t safely reach the suspected frozen section, contact a licensed plumber. The exact layout of pipes differs from home to home, and plumbing hidden inside a wall or ceiling is not a good place to improvise.
Before you thaw anything, check for a leak
Look for water around exposed pipes, under sinks, in a basement or crawl space, and near the main water line. If a pipe appears split, water is leaking, or you hear water running where it shouldn’t, shut off the home’s main water supply if you can do so safely. The shutoff’s location varies; knowing where it is before an emergency can save time. Call a plumber, especially if the damaged section is concealed or the shutoff is difficult to operate.
If you see water near electrical outlets, appliances or wiring, don’t enter the wet area to reach a valve or plug in a heater. Keep clear and get appropriate help. Never touch electrical equipment while standing in water.
How to thaw an accessible pipe
- Open the affected faucet slightly. A small flow gives melting water somewhere to go and can help you tell when the blockage is clearing. If you suspect a burst, shut off the main supply instead.
- Warm the pipe gently. For an exposed, accessible section, use a hair dryer, an electric heating pad or warm towels. Keep the heat moving along the pipe rather than concentrating it in one spot. Follow the appliance’s safety instructions, keep electrical equipment dry, and do not leave it unattended.
- Work from the faucet toward the colder section. As the blockage melts, water may begin to flow. Keep watching the pipe and nearby areas for leaks; a split can become apparent during thawing.
- Stop if you can’t reach the pipe safely. If the frozen section is behind a wall, in a ceiling or otherwise inaccessible, call a plumber rather than opening building materials or applying heat blindly.
Do not use a blowtorch, propane heater, charcoal stove or other open flame to thaw plumbing. Besides the fire risk, intense heat can damage a pipe or nearby materials. Do not use a space heater in a wet area or leave any portable heater unattended. If gentle warming doesn’t restore flow, or you’re unsure where the ice is, stop and get professional help.
Once water returns, keep checking
When the faucet flows again, inspect the thawed pipe and the areas below it for drips or dampness. Check again later: a small leak may not be immediately obvious. If water has escaped, address the leak promptly and dry affected surfaces to reduce the chance of further damage. If the water supply does not return, or another fixture begins to fail, a plumber can investigate whether the blockage extends farther into the system.
For a serious leak, use the main shutoff and call a plumber. If you rent, notify the landlord or property manager as soon as possible; they may need to arrange repairs or provide instructions for the building’s shutoff. In a multi-unit building, avoid operating a valve unless you know it controls your own unit.
Make the next freeze less risky
Prevention starts with the places where pipes are most exposed to cold: unheated spaces, exterior walls, garages and areas near drafts. Insulating exposed pipes can help, but insulation does not create heat; it slows heat loss. Seal gaps that let cold air reach plumbing, and keep vulnerable areas as warm as is practical. On very cold nights, opening sink-cabinet doors can let warmer indoor air reach pipes beneath a counter. If you do this, keep household cleaners and other hazards away from children and pets.
Before winter, locate the main water shutoff and make sure household members know how to reach it. Disconnect garden hoses and follow the instructions for your outdoor faucets and any interior shutoff valves. Advice can differ by fixture and climate, so check your local water provider’s guidance if available.
During an extreme cold spell, a small, steady flow from a vulnerable faucet may help reduce the chance of freezing, but it is not a substitute for protecting the pipe. Follow local utility advice, particularly if water restrictions are in effect. If you expect to be away, don’t simply turn the heat off: arrange to keep the home warm enough to protect its plumbing, or ask a qualified professional how to prepare the system.
The useful rule is simple: warm a reachable pipe gradually, never with an open flame, and treat any leak as a reason to stop and shut off the water. If the frozen section is hidden, the pipe is damaged, or you can’t work safely, a plumber is the safer next step.
