Outdoor Faucet Leaking? Handle, Stem & Vacuum Breaker Fixes
Where the water comes from tells you the fix and the price. A drip from the spout is usually a worn washer. A leak around the handle when the water is on is often a quarter-turn on the packing nut that costs nothing. A leak inside the wall only when the faucet runs is the expensive one: a burst frost-proof tube from a hose left on over winter. Here is how to read it.
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- !Water is leaking inside the wall or running down into the basement or crawl space when the faucet is on: a likely burst pipe, shut off the water
- !You see staining, bubbling paint, or mold on the interior wall behind an outdoor faucet
- !Water pools at the foundation and you cannot find the source on the visible spigot
- !The faucet body is cracked or split, common after a hard freeze
- !Water keeps flowing from the spout even with the handle fully closed and you cannot stop it
- ✓Locate the leak: from the spout tip, from around the handle stem, from the vacuum breaker on top, or from inside the wall behind it
- ✓A drip from the spout with the handle off points to a worn washer or cartridge inside the valve
- ✓A leak around the handle only when the water is on is usually a loose packing nut: snug it a quarter-turn with a wrench
- ✓Spray or drip from the round cap on top is the vacuum breaker: it often just needs its cap or internal part replaced
- ✓Disconnect any hose and confirm whether the leak stops, since a hose-end gasket can fake a faucet leak
- →A leak inside the wall when the faucet runs: a burst frost-proof tube needs a plumber
- →The spout still drips after a washer or cartridge replacement, meaning the valve seat is worn
- →The faucet body is cracked from freezing and needs full replacement
- →A soldered spigot inside the wall that has to be cut out and re-sweated
- →Recurring freeze damage that calls for a frost-proof sillcock upgrade
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Decode the leak by location
Drip from the spout, handle off: the seal inside the valve has worn. On a standard spigot that is a rubber washer at the end of the stem; on a newer faucet it may be a cartridge. The water gets past it and trickles out the spout. This is the most common outdoor-faucet leak and the least expensive to fix.
Leak around the handle, water on: the packing that seals the stem where it passes through the body has loosened or worn. The tell is that water appears at the handle only while the faucet is running and stops when you close it. Often the entire fix is tightening the packing nut a quarter-turn.
Spray or drip from the cap on top: that round cap is the vacuum breaker, the anti-siphon device code requires on outdoor faucets. Its internal parts wear and start leaking, usually fixed by replacing the cap or the breaker assembly, not the whole faucet.
Leak inside the wall, only when running: this is the expensive one. On a frost-proof faucet, the actual valve sits back inside the wall, and if the long tube froze and split (almost always from a hose left attached over winter), it leaks behind the wall the moment you turn the water on. Shut off the water and read on.
The two fixes you can do yourself
A loose packing nut is the easiest win. With the faucet running and leaking at the handle, take a wrench and turn the large nut just behind the handle a quarter-turn clockwise. Often that reseats the packing and the leak stops on the spot, at no parts cost. Do not crank it hard; snug is enough.
A spout drip is the next tier. Shut off the water to the faucet (the interior shutoff if you have one, or the main), unscrew the packing nut, withdraw the stem, and replace the washer or cartridge on the end. The parts are a couple of dollars. This is a genuine DIY job on a standard spigot, though a cartridge faucet may need the matching cartridge by brand. Either repair is $0 – $20 in parts done yourself, or $100 – $200 if a plumber does it.
The burst-pipe leak inside the wall
When water shows up inside the wall, the basement, or the crawl space only while the outdoor faucet is running, the frost-proof tube behind the wall has split. The usual cause is a garden hose left attached through a freeze: the hose traps water against the valve seat, it freezes, and the tube cracks where it cannot drain. You will not see it until spring when you open the faucet and water pours into the wall.
Shut off the water to that faucet and stop using it. This is a plumber repair, because the split is inside the wall, and it overlaps with the work on our burst pipe repair cost page, typically $300 – $800 depending on access and any drywall that has to come out. The replacement faucet should be a frost-proof unit, the same upgrade detailed in our hose bib replacement cost guide, so it does not happen again.
What each fix costs
The repair menu runs from nothing to a few hundred dollars depending on where the leak is. A packing-nut tightening is $0. A washer or cartridge swap is $0 – $20 in parts as DIY, or $100 – $200 for a plumber visit. A vacuum breaker repair is $20 – $100. A full faucet replacement, especially a frost-proof upgrade, runs $150 – $500 installed.
The in-wall burst is the outlier at $300 – $800 because the damage is hidden and the repair may include opening and patching the wall. The pattern holds across outdoor faucets: visible leaks at the handle or spout are cheap and often DIY, while anything behind the wall is a plumber and a bigger number.
Prevent the freeze that causes the worst leaks
Almost every expensive outdoor-faucet leak traces back to one autumn habit: leaving the hose connected. Disconnect every hose before the first freeze so the faucet can drain. If you have an interior shutoff on the line, close it and open the outdoor faucet to drain the pipe; that single step prevents most freeze splits.
For a faucet that has frozen before, upgrade to a frost-proof sillcock, which keeps the shutoff seat back inside the heated wall. The broader freeze playbook, from dripping faucets in a cold snap to insulating exposed runs, is in our frozen pipes guide, and it is far cheaper than the in-wall repair it prevents.
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