Streamlined Plumbing Field Guide · maintenance

It Only Leaks When the Hose Is Attached. That Narrows It to Two Things.

Where the water escapes tells you which part failed. A drip at the handle, a drip from a closed spout, and water coming from the cap on top are three different repairs on the same outdoor spigot.

By Brandon ByrdOwner · Licensed Master Plumber
November 6, 2026 · 8 min read
A weathered brass outdoor spigot mounted on a wooden exterior wall with a green garden hose attached

Where the water comes out is the whole diagnosis. An outdoor spigot leaking at the handle, one dripping from the spout with the valve shut, and one letting water past the cap on top are three separate parts failing in three separate ways, and only one of them has anything to do with the valve. If yours only misbehaves when a hose is connected, that single detail rules out most of the list and leaves two real candidates.

Three leaks, three different parts

An outdoor spigot is three components in one body. The location of the water tells you which one has gone.
Water at the handleDrip from the spout, valve closedWater from the cap on top
What has failedThe packing around the valve stemThe washer at the seatThe vacuum breaker on the outlet
When it showsOnly while the handle is openConstantly, hose or no hoseOnly with a hose attached and pressurised
Where it goesDown the body and the wall belowOut the spout, steadilyOut around or under the cap
Usual repairTake up or renew the packingRenew the washer or the stemReplace the vacuum breaker
What it is notA supply-pipe problemA water-pressure problemA valve problem

The middle column is the one people describe as a spigot that will not shut off. It is not a shut-off failure in any interesting sense — the stem is closing, but the rubber washer it presses against has hardened, torn, or worn a channel into itself, so the seal is imperfect. Closing the handle harder makes it worse rather than better, because forcing a tired washer against a seat deforms it further and can score the seat itself. That is the dripping faucet problem in outdoor form, and it is a small job.

The first column is smaller still. Packing is the material that lets a stem turn while holding pressure, and it hardens over the years. It leaks only while the handle is open, which is the giveaway.

The third column is the one that only appears with a hose on it, and it deserves its own section.

Why does it only leak when the hose is connected?

Because a connected hose with the nozzle shut is the only condition that puts standing pressure on the downstream side of the spigot. Open the valve with nothing attached and the water runs straight out onto the ground, pressure relieved. Open it with a closed hose on the end and the entire supply pressure sits there with nowhere to go — and two components that were coping fine now have to hold it.

The first is the vacuum breaker. That small dome-capped device on the outlet exists to stop water in the hose being siphoned back into the house supply if pressure in the main ever drops — a hose lying in a bucket, a kiddie pool, or a puddle where somebody has been mixing fertiliser. Inside is a seal and a small moving check. When the seal fails, back-pressure from a charged hose pushes water out around the cap, and the spigot looks like it is leaking from the top for no reason. The part is replaced, not rebuilt. That device is not the same thing as a certified backflow-prevention assembly, and testing those is separate specialised work we do not take on.

The second candidate is worse, and it does not always show outside at all.

That gives you a clean split between the two hose-only failures. If you can see the water outside, at the cap, it is the vacuum breaker and it is a small part. If you cannot see water outside but there is damp inside — a stain on interior drywall near that wall, a wet spot in a crawlspace, a ceiling mark on the floor below on an elevated house — the barrel is split behind the siding and that is a hidden water leak rather than a fitting problem.

What the coast does to outdoor brass

Salt aerosol does not stop at the dune line. It settles on every exposed metal surface within a good distance of the water, and an outdoor spigot is exposed by definition — no cabinet, no insulation, no paint on the working parts.

The practical effect is rarely a spigot that corrodes through. It is that the fittings stop coming apart. A packing nut that has spent ten years in salt air on a windward wall does not always yield to a wrench, hose threads pick up a crust that chews the washer in every hose fitting screwed onto them, and a vacuum-breaker cap can be seized on long before whatever is under it fails. So the same repair costs more effort at the beach than it does inland, and the honest recommendation more often ends up being a whole new spigot rather than a rebuild of the old one. That is the same pattern described in what salt air does to fixtures at Point Clear, applied to the one fixture that lives outside on purpose.

Elevation adds a second wrinkle. FEMA's flood mapping shows coastal high-hazard VE zones — areas where wave action, not just standing water, is expected — in the mapped area around Orange Beach, Gulf Shores, Fort Morgan and Bon Secour. Building above that means houses on pilings, and a house on pilings puts its hose bibs at deck level with the supply riser running exposed underneath in open air.

Three consequences follow from that geometry. The riser is in the weather for its whole length, so it is the coldest pipe in the house on a freeze night. It is easy to knock with a ladder, a kayak or a golf cart. And when it does leak, the water falls through framing and lands somewhere well away from the spigot, which is why the wet patch under an elevated beach house is often nowhere near the fitting that caused it. Tracking that back is leak search and repair rather than fixture work.

Where the spigot ends and the line behind it starts

A useful boundary, because it decides what kind of job this is.

Everything from the handle to the hose threads is the fixture, and fixture work is quick — a washer, a repack, a vacuum breaker, a whole spigot swapped out. That is faucet and fixture repair, and locally, outdoor spigot and fixture work in Orange Beach is the same visit as an indoor tap.

Behind the wall is different. The barrel of a frost-free unit, the stub of pipe it threads into, and the branch feeding it are supply piping, and a failure there is water line repair — a different access problem and a different conversation. The split-barrel case above sits precisely on that boundary, which is why it is worth identifying before anybody starts cutting.

One thing worth knowing before either job: find the shutoff valve for that spigot now, while nothing is wrong. Many outdoor bibs have a dedicated stop inside the wall or in the crawlspace. Many do not, and on those the only way to stop the water is the main. Ten minutes on a dry afternoon is worth a great deal at nine at night with a hose bib you cannot close.

What to check before you call

Take the hose off and watch for a full minute. If the leak stops entirely, you are looking at the vacuum breaker or a split barrel and not at the valve at all. If it continues, it is the seat washer.

Open the handle fully with the hose off and look at the base of the handle. Water there and only there is packing.

Then check inside. Same wall, both levels, and underneath if the house is elevated. A hose-only leak with damp on the inside is the case that should not wait, because it has been putting water into a wall cavity every time somebody watered the garden.

For anything wider — several outdoor fittings behaving badly at once, or a spigot on a property you only visit occasionally — the Fort Morgan service area page covers how that side of the county is handled.

(251) 423-7654, any hour. Brandon Byrd, Alabama Master Plumber MP-4462.


Sources. Flood-zone composition from the FEMA National Flood Hazard Layer, queried for the mapped area around each community coordinate; VE denotes a coastal high-hazard area subject to wave action.

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Questions. Answered.

  • Why does my outdoor spigot only leak when the hose is connected?
    Because a connected hose with its nozzle closed does something no other condition does: it holds pressure on the downstream side of the valve. Two failures only reveal themselves under that pressure. The small anti-siphon device on the spigot's outlet is designed to seal against exactly that back-pressure, and when its seal has failed it lets water out around the cap on top. Separately, a frost-free spigot with a split barrel inside the wall has nowhere to relieve pressure once a closed hose blocks the spout, so the water goes into the wall instead.
  • What is the little cap on top of my outdoor spigot?
    It is a hose-bib vacuum breaker, and it stops water in a hose being drawn backward into the house's supply if pressure in the main drops. Without one, a hose lying in a bucket, a pool or a puddle of fertiliser can be siphoned back the way it came. It is a small brass or plastic device threaded onto or built into the spigot's outlet, and it is a replaceable part rather than a repairable one. When its seal goes, the symptom is water escaping around that cap while a charged hose is attached, and nothing at all the rest of the time.
  • My spigot drips from the handle when it is running. What is that?
    That is the packing around the valve stem, not the valve itself, and it is the least serious of the three common leaks. The stem has to turn while still sealing against water pressure, and the material doing that sealing compresses and hardens over years. The tell is timing: packing leaks appear when the handle is open and stop when it is closed. Sometimes a careful quarter-turn on the packing nut takes it up. When that does not hold, the stem assembly is repacked or replaced, and the spigot stays where it is.
  • What is a frost-free sillcock, and why did mine fail months after the freeze?
    A frost-free spigot moves the valve seat to the far end of a long barrel, so the water shuts off inside the heated wall rather than out in the weather. The barrel then drains itself through the spout. That works until a hose is left attached, which blocks the spout and leaves the barrel full to freeze and split — inside the wall, out of sight. The damage happens in January and stays silent, because with the valve closed the split section is not pressurised. It shows up the first warm day somebody attaches a hose.
  • Does salt air really damage outdoor spigots?
    It works on them. Salt aerosol carries well inland from the beach and settles on everything exposed, and outdoor brass is exposed by definition. What we see is external corrosion around the packing nut and the hose threads, handles that seize, and vacuum-breaker caps that are welded in place by corrosion long before the part inside them fails. It is not that a spigot on a Fort Morgan beach house rots away. It is that ordinary maintenance on one — a washer, a repack — turns into a replacement more often because the fittings will not come apart.
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