Outdoor Faucet Leaking

An outdoor faucet - a hose bib or sillcock - is a simple valve, and almost all of its failures fall into three groups. The one thing that distinguishes them is where the water appears and whether the handle is open or closed at the time. Work that out before you buy a part.

A drip from the spout with the handle fully closed is a sealing failure inside the valve: the rubber washer on the end of the stem has flattened or torn, or the brass seat it presses against is pitted. This is the most common hose bib fault and the least serious. It wastes water and it keeps the wall and the ground below permanently damp, but nothing is broken structurally.

Water escaping from around the handle while the faucet is running is the packing - the graphite or rubber seal that lets the stem turn without leaking around it. On many bibs the packing nut can simply be snugged. It is also harmless as long as the water is going outside.

The third case is the one that matters. If the faucet works but water shows up somewhere it should not - a damp patch on the inside of the wall, a stain on a ceiling below, water running along the foundation, or the ground near the wall staying wet - the pipe serving the bib has failed behind the siding or inside the wall cavity. That is a leak inside the building envelope and it does not get better.

• Drips from the spout, handle closed - stem washer or valve seat. Low urgency, easy part.
• Water around the handle, only while running - packing nut or packing washer. Often just needs snugging.
• Water inside the wall, in a ceiling, or at the foundation when the faucet is on - a split pipe or a cracked bib body behind the wall. Shut the water off.
• Faucet turns but no water, or very little - the line behind it is blocked by ice or already split further back.
• Spout sprays or weeps from the body casting rather than the opening - a cracked bib, usually from a freeze. The whole fitting gets replaced.
• Water appears at the bib when the irrigation runs - that is the backflow assembly or an irrigation line, not the hose bib.

North Texas does not freeze often, which is exactly why its exterior plumbing is exposed. Hose bibs on houses in Dallas, Garland, Richardson, Mesquite and the older Collin County suburbs are frequently plain spigots rather than frost-proof sillcocks, and a hose left connected over a cold night traps water at the bib where it has nowhere to expand.

What makes this deceptive is the timing. The split happens during the freeze, but the pipe stays frozen and nothing leaks. Weeks later somebody connects a hose for the first warm weekend, opens the valve, and water pours into the wall cavity instead of out of the spout. The first sign is often a damp baseboard or a stain on drywall several feet from the faucet, and homeowners understandably look for a leak there rather than at the bib they just used.

A frost-proof sillcock changes where the valve actually closes. The stem is long and the seal sits a foot or more inside the heated wall, so the short section of exposed pipe drains itself every time you shut it off - as long as no hose is attached. Leave a hose connected on a frost-proof bib and you defeat the whole design, because the water cannot drain back out.

The practical consequence for anyone with a leaking outdoor faucet in spring: if the leak is new and you had a hard freeze that winter, assume a freeze split until proven otherwise, and test the faucet with someone inside the house watching the wall behind it.

The two simple faults are reasonable homeowner work. The sequence matters - find the shut-off before you take anything apart, because a hose bib that comes apart under pressure is a wet afternoon.

1. Locate your shut-off before you start. Many houses have a dedicated valve for the exterior bib inside the garage, a utility closet or a crawl space; if not, you need the main shut-off at the meter box near the street. Confirm it turns.
2. Disconnect any hose, splitter or timer and test the faucet bare. Hose washers, quick connects and Y-splitters leak constantly and get blamed on the faucet. A surprising share of reported hose bib leaks are the hose fitting.
3. For water escaping around the handle while running, try snugging the packing nut - the hex nut directly behind the handle - about a quarter turn with a wrench while the faucet is open. If it stops, you are done.
4. For a drip with the handle closed, shut the water off, open the bib to drain it, remove the handle screw and handle, back the packing nut out and withdraw the stem. The washer is held on the end by a single brass screw. Replace the washer, and inspect the seat inside the body for pitting while you have it apart.
5. Reassemble, restore water slowly, and run the faucet while someone watches the wall and the ceiling inside the house. This is the step that catches a freeze split.
6. If the bib body itself is cracked, if the stem will not come out, if the whole fitting turns in the wall when you put a wrench on it, or if water appears indoors - stop, shut the water off and leave it for a plumber.

Some of these faults are a washer. Others are a pipe inside a wall, and the difference is worth taking seriously, because water in a wall cavity does its damage quietly.

Shut the water off and get it looked at if water appears anywhere inside the building when the faucet runs, if the bib or the pipe behind it turns when you apply a wrench, if the fitting body is cracked, or if the faucet has no flow after a freeze. Also treat a soaked area along the foundation as worth investigating rather than ignoring - a continuously wet spot against a slab on the expansive clay soils common across the Dallas area keeps that one patch of ground moving while the rest dries, and that differential is not something you want running for months.

Replacing a hose bib is more involved than it looks from outside. The fitting is connected to copper or PEX behind the wall, usually by a soldered or crimped joint that is not accessible without opening the interior wall or working through a crawl space, and a frost-proof replacement has to be the right length for the wall it is going into. Getting it wrong leaves a valve that seals in the cold zone, which puts you back where you started next winter.

Dallas Best Plumber is a free referral service, not a plumbing company. Tell us where the water appears, whether the handle is open or closed when it happens, and whether you have had a freeze since the faucet last worked properly, and we put your request in front of licensed, insured local plumbers who handle exterior and water line repair, with a free, no-obligation quote. We never perform the work ourselves.

• Any water indoors, in a ceiling or along the foundation when the faucet is on - shut the main off
• The bib turns in the wall, or the body is cracked
• No flow from the faucet following a hard freeze
• The leak returns after a new washer - likely a damaged seat or a cracked body
• You cannot find a shut-off that isolates the faucet
• The wet area is near the slab edge and has been wet for weeks

Outdoor faucet failures in this region are overwhelmingly freeze failures, and the prevention is cheap and takes one afternoon before the first front. Disconnect every hose, splitter and timer in late fall and store them - a connected hose is the single biggest cause of a split bib here. Fit insulated covers over plain spigots. Find out whether your bibs are frost-proof or ordinary, because that determines whether draining happens automatically or not at all.

Check the irrigation backflow assembly at the same time. Nearly every home in the Dallas area has an above-ground backflow device on the irrigation system, and it is exposed brass and plastic that cracks readily in a hard freeze. It is a separate component from the hose bib and it fails the same way, for the same reason.

Then, while the weather is still mild, confirm that the shut-off for the exterior faucets actually works and that everyone in the house knows where the main is. A split bib discovered in April is an inconvenience; a split bib discovered while water is running into a wall is an emergency, and the difference between the two is whether you can close a valve in thirty seconds.