Frozen Pipe? What to Do — and What Never to Try

It’s January, the overnight low hit single digits, and a faucet that worked yesterday now gives you a thin trickle — or nothing at all. Somewhere between your main valve and that tap, water has frozen solid inside the pipe. What you do in the next hour decides whether this ends with restored water flow or with water pouring through a ceiling. This guide walks through both sides: the steps that help, and the mistakes that turn a frozen pipe into a burst one.

First, confirm the pipe is frozen — not burst

A frozen pipe and a burst pipe need different responses:

• One faucet drops to a trickle or goes dry while others still work, during or right after freezing weather — the classic frozen-pipe signature.
• Frost visible on exposed pipes in the basement, or odd clanking and whistling when you open a tap.
• Only the fixtures on one run are affected — for example, the kitchen sink works but the bathroom on the same exterior wall doesn’t. That points to a freeze between the main and that fixture.
• Water appearing on floors, walls, or ceilings is a different situation entirely: the pipe has likely split. Shut your main valve and call a local technician — the steps below are for a pipe that is frozen but still intact.

What to do right now

1. Open the affected faucet to a trickle. This is the single most important step. Melting water needs somewhere to go, and an open tap relieves the pressure that builds behind the ice blockage. Pressure — not the ice itself — is what splits pipes, so never leave the faucet fully closed on a frozen line.

2. Open cabinet doors under sinks on exterior walls. Room heat is your gentlest thawing tool. Opening the cabinets lets warm air reach pipes that sit against the cold side of the wall.

3. Warm the area gently. Nudge the thermostat up a few degrees and keep the heat steady. A space heater aimed at the right wall can help — but only while you stay in the room with it, and only kept well clear of anything flammable. Never leave a space heater running unattended.

4. Find your main water shutoff now, before you need it. In most South Jordan homes it’s in the basement near the meter. Make sure everyone in the household knows where it is and how to turn it. If the pipe splits while you’re working on it, the shutoff is the difference between a mop-up and a flood.

5. Call a local technician. A frozen section you can see and reach is one thing; a freeze inside a wall cavity is another. Local plumbers locate the exact frozen section and thaw it with controlled electric heat, then pressure-check the line for hairline cracks the freeze may have opened. Guessing at a hidden freeze — or cutting into drywall blind — is how frozen pipes become burst pipes.

What never to try

Never use an open flame or a torch on a pipe. This is the most dangerous mistake homeowners make. A torch can start a fire inside the wall cavity, and the sudden extreme heat can split the pipe outright. No frozen pipe is worth a house fire.

Never pour boiling water on a frozen pipe. The thermal shock can crack copper and damage joints — the pipe goes from frozen to split in seconds.

Never crank the thermostat to extremes. Steady, moderate heat is safer for the whole system. Wild temperature swings stress pipes and don’t thaw the frozen section any faster.

Never ignore it and hope for a natural thaw. Some frozen pipes do thaw without splitting — but ice keeps expanding the longer it sits, and the split often happens during the thaw, when water starts moving again. Every hour a pipe stays frozen is another hour of risk.

Never cut into drywall to “find” the freeze unless you can shut the water off first and you know exactly what you’re doing behind that wall. A wrong cut floods the wall cavity. Call a local technician instead — they trace the line without tearing your home apart.

Why rushing the thaw can burst the pipe

The danger isn’t just the ice — it’s the pressure trapped between the ice blockage and your closed tap. When water freezes it expands roughly nine percent, and that expansion pushes against everything around it. Thawing has to happen in the right direction — starting at the faucet end and working back toward the freeze — so melting water and pressure can escape through the open tap. Thawing from the middle, or blasting heat at one spot, traps pressure and pops the pipe. It’s the reason local plumbers thaw gradually with controlled heat: slow is what keeps a frozen pipe from becoming a burst one.

The South Jordan part of this story

Frozen pipes here aren’t random. South Jordan’s winter inversions park the valley below freezing for a week at a time — daytime highs never climb above freezing, overnight lows drop into the single digits, and cold soaks through walls into pipe cavities. The west bench takes extra canyon wind off the Oquirrhs, driving cold into wall cavities faster. The city’s 1980s and 90s homes with copper runs in exterior walls and rim joist bays are the classic freeze locations; hose bibs and irrigation tie-ins that never got shut off before the first hard freeze are close behind. If one pipe in your home has frozen, your house has a pattern — and the other vulnerable runs will freeze too, usually on the next cold snap.

If the pipe has already burst

You’ll know: water where it shouldn’t be, a pressure drop, the sound of running water with every tap off. Shut the main valve immediately. If water is near outlets, your electrical panel, or the furnace, don’t step in it — turn off power to the area at the breaker only if you can do so safely. Move valuables off the floor, then call a local technician. A burst pipe is the one plumbing problem where the call genuinely can’t wait.

Quick answers

Can I thaw a pipe myself with a hair dryer? On an exposed pipe you can see fully — yes. Keep the dryer moving, start near the faucet, and work back toward the frozen section. Never use a torch or open flame, and never thaw a pipe you can’t see completely. If the frozen section is inside a wall, call a local technician.

How long can a pipe stay frozen before it bursts? There is no fixed timeline — it depends on the temperature, the pipe material, and how much pressure is trapped behind the ice. The risk climbs the longer it stays frozen and the colder it gets. Don’t wait it out to find the limit.

---

A dead faucet in a cold snap is your warning shot. Open the tap to a trickle, warm the area gently, know where your shutoff is, and call a local technician if the freeze is anywhere you can’t see: 📞 (801) 806-0338.

More guides