Only one faucet has no water
Other fixtures still work, but one sink, tub, toilet, or hose bib has little or no flow.
Start here: Trace that fixture's supply path first. The frozen spot is usually close to the cold area that line passes through.
Plumbing
Frozen Pipes No Water
Direct answer: If you have little or no water during a hard freeze, the most likely cause is a frozen supply line in an exposed wall, crawl space, basement rim area, garage, or outside run. Start by figuring out whether one faucet, one side of a faucet, or the whole house is affected, then warm that section gently and watch closely for leaks as it thaws.
Most likely: A localized frozen pipe branch near an exterior wall or unheated space is the most common cause, especially when one bathroom, kitchen sink, hose bib, or only the cold line quits first.
Treat this like a thaw-and-inspect job, not just a no-water problem. Reality check: the pipe may already be split even if you have not seen water yet. Common wrong move: cranking up heat on one spot too fast and walking away before the line starts leaking.
Don’t start with: Do not start with a torch, propane heater, open flame, boiling water, or a space heater aimed into a tight hidden cavity. That is how pipes, wiring, insulation, and framing get damaged fast.
If only one fixture is deadFocus on the pipe run feeding that fixture, especially where it passes an outside wall, cabinet back, crawl space, or garage.
If the whole house is deadCheck whether the main is frozen near the entry point or whether the municipal supply is interrupted before you start opening walls.
Last reviewed: 2026-04-04
Figure out how much of the plumbing is affected before you try to thaw anything
Cold side is dead but hot still runs
A faucet gives hot water normally, but the cold side is weak or completely off.
Start here: Look for a frozen cold-water branch, not a whole-house problem. Exterior kitchen and bathroom walls are common spots.
Both hot and cold are weak at one area
A bathroom group or kitchen area loses most or all water, while the rest of the house still works.
Start here: Check the shared branch feeding that area, especially under floors, in crawl spaces, or where pipes pass through an unheated cabinet or chase.
Whole house has no water during a freeze
Every fixture is dead or nearly dead, often right after a severe cold snap.
Start here: Check with neighbors and inspect the main water entry area first. The freeze may be at the service entry or outside your house.
Most likely causes
1. Frozen pipe in an exterior wall, crawl space, attic knee wall, garage, or basement rim area
This is the classic pattern when temperatures drop fast and one fixture or one branch quits first.
Quick check: Feel for very cold wall sections, look for frost on exposed pipe, and note which nearby rooms or fixtures still have water.
2. Frozen cold-water branch under a sink cabinet or behind stored items
Kitchen and bath sink lines freeze when cabinet doors stay closed and the back wall gets cold.
Quick check: Open the cabinet, remove packed items, and compare the cold line temperature to the hot line if both are accessible.
3. Frozen main water line near the house entry point
If the whole house is out during a hard freeze and neighbors still have water, the freeze may be where the service enters the home.
Quick check: Find the main shutoff and incoming pipe. If that area is unheated or drafty, it is a strong suspect.
4. Water supply interruption that only looks like frozen pipes
A utility outage, closed valve, or well issue can mimic a freeze-up, especially when every fixture is dead.
Quick check: Ask a neighbor, check for utility notices, and confirm the main shutoff is fully open before chasing a hidden frozen section.
Step-by-step fix
Step 1: Separate a frozen branch from a whole-house outage
You do not want to start heating random walls if the problem is only one branch or if the water supply is off for another reason.
- Try several fixtures on different floors, including one closest to where water enters the house.
- Check whether the problem is only cold water, only one room group, or the entire house.
- If you are on city water, ask a nearby neighbor whether they have water.
- Make sure the main water shutoff is fully open and has not been bumped partly closed.
- If you are on a well, listen for obvious pump trouble and note whether pressure dropped before the freeze.
Next move: If you narrow it to one fixture or one area, move to that branch and thaw locally. If the whole house is out and neighbors also have no water, wait for the supply to return. If the whole house is out but neighbors are fine, inspect the service entry area and be ready to call a plumber.
What to conclude: Most no-water freeze calls turn out to be one exposed branch, not every pipe in the house. Whole-house loss points you toward the main entry or a non-freeze supply problem.
Stop if:
- You find standing water, a split pipe, or active leaking anywhere.
- The main shutoff will not move or looks corroded enough to break.
- You suspect the freeze is in a concealed area with electrical wiring you cannot safely access.
Step 2: Find the most likely frozen section before adding heat
The frozen spot is usually between the last working fixture and the dead one, and usually near the coldest exposed section of that run.
- Open the faucet served by the suspected frozen line so it is slightly on. This gives melting ice somewhere to relieve pressure.
- Trace the pipe route through cabinets, basement ceiling, crawl space, garage wall, or utility room if any part is visible.
- Look for frost, bulging insulation, unusually cold pipe, or a line tight against exterior sheathing or masonry.
- Open sink base cabinet doors on exterior walls and move stored items away from the back wall.
- If one side of a faucet works and the other does not, focus only on the dead side's supply line.
Next move: If you can identify a short exposed section that is likely frozen, you can thaw that area slowly and watch for flow. If the line disappears into a wall or ceiling and you cannot narrow it down, warm the room gently and consider a plumber before opening finishes blindly.
What to conclude: A good location guess saves time and lowers the chance of overheating the wrong area. Hidden freezes are common, but there is usually a clue trail.
Step 3: Thaw the pipe slowly and evenly
Gentle, spread-out heat is safer for the pipe and the house, and it gives you time to catch a leak as the ice plug releases.
- Keep the affected faucet open while thawing.
- Raise the room temperature first if possible, especially in cabinets, utility rooms, basements, or crawl-space access areas.
- Use a hair dryer on a low to medium setting, moving constantly along the exposed pipe from the faucet end back toward the colder section.
- For a sink cabinet freeze, aim warm room air into the cabinet and keep doors open.
- If the pipe is exposed in a basement or crawl space, warm a broad section gradually instead of blasting one small spot.
- Stay in the area the entire time and listen for hissing, dripping, or a sudden rush of water.
Next move: A sputter, then a weak stream, then normal flow means the ice is clearing. Keep watching the pipe for several minutes because leaks often show up right after flow returns. If there is no change after careful warming, the freeze may be deeper in a wall, farther upstream, or the problem may not be a frozen pipe at all.
Step 4: As soon as water returns, check for a burst pipe
This is the moment hidden damage shows itself. Catching it early can save drywall, flooring, cabinets, and insulation.
- Run the restored fixture at a moderate flow for a minute while watching every exposed section of that branch.
- Check below and behind the thawed area for drips, wet insulation, fresh stains, or a fine mist.
- Look at ceilings below the thawed run and around baseboards for new wet spots.
- If you find a leak, shut off the nearest local valve if there is one. If not, shut off the main water supply.
- Dry the area as best you can and leave access open for repair.
Next move: If the line holds pressure with no leaking, you can move on to prevention and keep the area warmer through the cold spell. If the pipe leaks, the job changes from thawing to pipe repair. Do not keep repressurizing a split line just to test it again.
Step 5: Protect the line so it does not freeze again tonight
A pipe that froze once during this weather will usually freeze again unless you fix the cold exposure.
- Keep the room, cabinet, crawl space, or basement area warmer until the cold snap passes.
- Seal obvious drafts near the pipe route, especially around sill plates, access doors, and pipe penetrations, using safe weather-sealing methods appropriate for the area.
- Add frozen pipe insulation to exposed supply lines in basements, crawl spaces, garages, and other unheated spaces.
- Use frozen pipe heat cable only where the product is specifically intended for household water pipes and the pipe is accessible enough to install it safely and correctly.
- If the same area freezes repeatedly, plan a more permanent fix such as better insulation, air sealing, or rerouting the vulnerable section.
A good result: If the pipe stays flowing through the next cold cycle, you solved the immediate problem and reduced the repeat risk.
If not: If the line keeps freezing even after warming and basic protection, the exposure is too severe or the vulnerable section is too hidden for a simple DIY fix.
What to conclude: Prevention is the real repair on repeat freeze-ups. Once a line proves vulnerable, it needs protection, not just another thaw.
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FAQ
How do I know if a pipe is frozen or if the water company shut the water off?
Check a few fixtures and ask a neighbor. If neighbors also have no water, it may be a supply outage. If only your house is affected, or only one area of your house is affected during freezing weather, a frozen pipe is much more likely.
Should I leave the faucet open while thawing a frozen pipe?
Yes. Open the affected faucet slightly. That gives melting ice and trapped pressure somewhere to go, and it helps you know when the line starts clearing.
Can I use a space heater to thaw frozen pipes?
Only as general room heat in an open, attended area, not jammed into a cabinet or aimed into a hidden cavity. A hair dryer with constant movement is usually the safer targeted option for exposed pipe.
What if hot water works but cold water does not?
That usually points to a frozen cold-water branch, not a whole-house problem. Focus on the cold line serving that fixture or room group, especially where it runs near an exterior wall or unheated space.
What should I do if the pipe starts leaking after it thaws?
Shut off the nearest local valve if you have one. If not, shut off the main water supply right away. A thawed pipe that leaks has already failed and needs repair before you put it back into normal service.
Can frozen pipes thaw on their own?
Yes, sometimes they do when the house warms up, but that is not always a good outcome. The risk is that the pipe may split while frozen and only start leaking once pressure returns, so you still need to inspect the area carefully.