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When one faucet loses water while the rest of your home works fine, the cause is almost always local to that fixture: a clogged aerator, a dislodged washer, or an airlock in that specific line. When multiple faucets are affected, the cause is more likely a frozen pipe, a main water line issue, or clogged pipes further upstream. Checking every other tap in your home is the fastest way to tell which category you’re dealing with.
Step 1: Check Every Other Faucet First
Before diagnosing anything else, run both hot and cold water at every faucet in your house. This single step tells you whether the problem is isolated to one fixture or affecting your whole plumbing system, which determines everything else about how to proceed.
If Only One Faucet Is Affected
Clogged Aerator
This is the most common cause of low or no flow at a single fixture. Mineral deposits from hard water build up inside the aerator screen over time. Unscrew the aerator and look for white or chalky buildup; rinse it under water, or soak it in white vinegar to dissolve stubborn deposits before reattaching.
Dislodged or Damaged Tap Washer
If a faucet drips intermittently or won’t shut off fully rather than losing flow entirely, a worn or dislodged washer inside that specific tap is the likely cause. Since this only affects the one fixture with the faulty part, other taps working normally helps confirm this diagnosis.
Airlock in That Line
An air bubble trapped in the pipe feeding a single fixture can block water flow entirely. Small airlocks sometimes clear on their own. For a stubborn one, connect a hose between that faucet and a working tap, tightly sealed, then turn on the working tap to build pressure and push the airlock through — let water run for 2 to 10 minutes to give the trapped air time to escape.
If Multiple Faucets Are Affected
Frozen Pipes
Frozen pipes can block water to your entire house or just to certain lines, depending on which section froze. This is especially common after being away from home for several days in cold weather, or in unheated spaces like basements and crawlspaces. A hairdryer or heat gun can help thaw a pipe, used carefully — a pipe that has already cracked from freezing can flood your home once it thaws, so proceed cautiously and know where your main shutoff is.
Main Water Line Issues
If your neighbors are experiencing the same problem, the issue likely traces back to your water provider’s main line rather than anything in your home’s plumbing. Contact your water supplier directly for details and an estimated resolution time.
Clogged or Sedimented Pipes
Sediment, mineral scale, and metal deposits can build up inside pipes over time and restrict flow throughout your system. To flush minor sediment buildup, open every cold water tap in the house fully and let them run for 20 to 30 minutes; this often clears the water as it flows. If the problem persists after flushing, a professional plumber can identify pipe condition and clear more serious buildup.
If It’s Only Hot Water That’s Missing
When cold water works fine but hot water doesn’t reach a fixture, the cause typically lies with the water heater, the hot water line specifically, or a partially closed valve on that line — not the fixture itself. Since this narrows the problem considerably, it’s worth checking whether other fixtures in the house have hot water before assuming the water heater itself has failed.
When to Call a Professional
DIY troubleshooting is reasonable for a clogged aerator, a minor airlock, or basic sediment flushing. But if you’ve checked every faucet, ruled out a main line issue with your neighbors, and still can’t identify the cause — or if you suspect frozen or damaged pipes — a professional plumber can diagnose the issue accurately rather than leaving you guessing.
If low flow is accompanied by a sudden, house-wide pressure drop rather than one isolated fixture, see our guide on what to do if water pressure suddenly drops for next steps.
For plumbing issues that need immediate attention, our 24-hour emergency plumbing team is available around the clock.
Frequently Asked Questions
Why does only one faucet in my house have no water?
This almost always points to something local to that fixture — most commonly a clogged aerator from mineral buildup, a dislodged washer, or an airlock in that specific line. If every other faucet works normally, the cause is isolated rather than a whole-house issue.
How do I clear an airlock in my pipes?
Connect a hose between the affected faucet and a working tap, sealed tightly, then run the working tap to build pressure and push the trapped air through. Let water flow for 2 to 10 minutes to give the airlock time to fully clear.
Can frozen pipes affect just one part of my house?
Yes. Depending on which section of pipe freezes, frozen pipes can affect your entire water supply or just certain lines and fixtures. This is especially common in unheated spaces like crawlspaces, basements, or homes left unoccupied during a cold snap.
How do I flush sediment out of my pipes?
Turn on every cold water tap in the house fully and let them run for 20 to 30 minutes. This flushes accumulated sediment through the system. If water doesn’t clear or the problem returns quickly, a professional plumber should assess the pipe condition.
If hot water is missing but cold water works fine, is the water heater the problem?
It’s one likely cause, but not the only one — a partially closed valve on the hot water line can produce the same symptom. Check whether other fixtures have hot water first; if none do, the water heater or its supply line is the more likely culprit.
