A faucet that suddenly slows to a trickle during a cold spell may be warning you that a pipe has frozen. The best response is not to reach for the hottest tool in the garage. It is to find the affected area, apply gentle heat and stay ready for a leak: a pipe may split as ice forms, and damage can become apparent when the ice melts.
Start by checking other taps. If several have lost water, the problem may involve a main supply line or a wider interruption, rather than one frozen branch. If the trouble is limited to a single faucet, a nearby pipe—often in an unheated space or against an exterior wall—may be the culprit.
Before you thaw anything, know where the water shutoff is
Locate your home’s main water shutoff if you can do so safely. Knowing how to close it can make a major difference if a pipe leaks. If you see water already escaping, hear water running where it should not, or suspect a pipe has burst, shut off the supply and call a plumber. If water is near electrical equipment or outlets, keep clear and seek qualified help.
For a suspected frozen pipe with no visible damage, open the affected faucet. A small flow—or even a drip—gives water somewhere to go as the ice melts. If both hot and cold lines serve the tap, open both handles. Don’t force a handle that is stuck.
Thaw the pipe with controlled heat
If the frozen section is accessible, warm it gradually. A hair dryer, an electric heating pad, or towels soaked in hot water are options described by the American Red Cross. Begin near the faucet and work back toward the colder part of the pipe. This helps keep meltwater moving toward the open tap rather than trapping pressure behind ice.
Keep the heat source under your control and follow its safety instructions. Keep electrical devices away from standing water, and don’t leave a heater unattended. Never use a blowtorch, propane heater, kerosene heater or other open-flame device to thaw household plumbing. Open flames can start a fire or damage the pipe and nearby materials. If you cannot reach the frozen section safely, stop and call a licensed plumber.
As the pipe warms, watch and listen for signs of trouble. A leak may not be obvious until the ice clears. Once water begins flowing, leave the tap open briefly and check the exposed pipe, nearby cabinets and the surrounding floor for moisture. If flow does not return or you discover a leak, shut off the water and get professional help.
Reduce the chance of a second freeze
When temperatures are expected to fall, focus on pipes that are exposed to cold air: those in basements, crawl spaces, garages, attics and cabinets along outside walls. Insulating vulnerable sections can help, but insulation is not a substitute for heat in a space that gets extremely cold. Repair gaps that let cold air reach pipes, especially where plumbing passes through exterior walls.
During a cold snap, keep the home warm, including overnight. The Red Cross advises keeping the thermostat at the same setting during the day and night in very cold weather. If a sink is on an exterior wall, opening the cabinet doors can let warmer room air reach the pipes. Move stored items that block airflow, and keep children away from cleaning products or other hazards inside the cabinet.
A slow drip from a faucet supplied by an exposed pipe may help keep water moving during severe cold. It is a precaution, not a guarantee, and local advice or plumbing arrangements may differ. If you use this measure, make sure the drain is clear and the water cannot overflow or freeze on a walkway. If you leave home in freezing weather, don’t simply turn the heat off: arrange for the building to stay warm and, if appropriate, have someone check on it.
Outdoor plumbing deserves attention too. Disconnect garden hoses before winter, and use the home’s shutoff for an outdoor faucet if it has one. Drain the line according to the fixture’s instructions. If you are unsure whether an exterior faucet or pipe can be isolated, ask a plumber rather than guessing at valves.
When a do-it-yourself fix is the wrong call
Some frozen pipes are hidden behind walls, under floors or in areas that are difficult to reach. Don’t cut into a wall or floor just to chase a suspected freeze unless you know what is behind it. Call a plumber if you cannot locate the blockage, safe thawing does not restore flow, the pipe is damaged, or the same section freezes repeatedly. A recurring freeze may point to an insulation or air-leak problem that needs a more lasting repair.
Freezing weather can turn a small plumbing problem into water damage, but a quick response does not require risky heat or improvised repairs. Know the shutoff, open the affected tap, warm accessible pipes carefully and treat any leak as a reason to stop and get help. After the immediate cold passes, use the location of the freeze to decide which pipes need better protection before the next one.
