Outdoor faucet leaking: find where it drips, fix the hose bib and protect it from freezing

Hose bib, spigot, sillcock: the same faucet

Outdoor faucet, hose bib (or hose bibb), spigot and sillcock all describe the valve on the outside wall where you attach a garden hose. A frost-free sillcock, also sold as a frost-proof wall hydrant, has a long body that reaches through the wall so the valve itself closes inside the heated house. The British term is outside tap.

Where it drips and what it means

Dry the faucet, then check it twice: once closed and once fully open with a hose attached and the nozzle shut.

Every drip adds up. The EPA's WaterSense program notes that a faucet dripping once a second wastes more than 3,000 gallons a year.

How to fix a leaking outdoor faucet

First, shut off the water

Many homes have a separate shut-off valve inside, on the pipe that runs to the outdoor faucet, often near the basement or crawl space ceiling just inside the wall. Close it, then open the outdoor faucet to drain the line. If there is no separate valve, close the main shut-off.

Leak at the hose connection

The EPA's advice: replace the nylon or rubber hose washer inside the hose coupling and make sure the connection is tight, using pipe tape and a wrench on the faucet threads if needed. Check the hose itself for splits near the coupling.

Drip from the spout when closed (standard faucet)

1. 01

   Remove the handle

   Undo the screw in the center and pull the handle off.

2. 02

   Loosen the packing nut

   Turn the nut just behind the handle counterclockwise with a wrench.

3. 03

   Unscrew the stem

   Turn it out of the body the way you would open the faucet.

4. 04

   Replace the seat washer

   Undo the brass screw at the end of the stem and fit an identical washer. Take the old one to the store to match it.

5. 05

   Check the seat

   Feel inside the body with a fingertip. A rough or pitted seat will chew up new washers; a plumber can reface it, or the faucet can be replaced.

6. 06

   Reassemble and test

   Screw the stem back in, tighten the packing nut snugly, refit the handle and turn the water back on.

Drip from the spout when closed (frost-free sillcock)

The washer sits at the far end of a long stem, inside the wall. The whole stem comes out the same way: loosen the packing nut and unscrew it. Replacement stems and washers are made for each model and length, so measure the stem tip to tip and take it with you. If a new washer or stem still drips, the seat inside is damaged and the sillcock needs replacing.

Leak around the handle

Tighten the packing nut about a quarter turn with the faucet open. If it still weeps, replace the packing washer or the stem seals. Avoid force: a cracked nut or bent stem makes a small job bigger.

Leak from the vacuum breaker

A vacuum breaker that sprays or leaks continuously while the faucet runs has worn seals. Many unscrew from the spout and can be replaced; some are fixed with a set screw and built into the faucet. Use a replacement that fits your model.

How frost-free sillcocks work and why hoses burst them

A standard hose bib holds water right at the outside wall, where it can freeze. A frost-free sillcock moves the valve inside the heated part of the house, at the end of a long tube. When you close it, water in the tube drains out of the spout, so there is nothing left to freeze outdoors.

That only works when two conditions hold:

• It slopes down toward the spout. Manufacturer installation guides stress a slight downward angle; installed level or tilted up, water stays in the tube and can freeze.
• Nothing is attached in freezing weather. A hose, a "Y" splitter, a timer or an add-on backflow device traps water in the tube. As that water freezes back toward the valve, the pressure splits the tube inside the wall.

The trap is timing. A split tube leaks only when the faucet is open, so you discover it on the first warm day of spring, often as water running inside the wall, onto the basement ceiling or into the crawl space. The first time you use each outdoor faucet after winter, have someone look inside, behind the faucet, while it runs for a few minutes. Any water there means: close the shut-off and replace the sillcock. Our leak detection guide helps if the water has spread out of sight.

How to winterize an outdoor faucet

Do this before the first hard frost.

1. 01

   Disconnect the hose

   Remove hoses, splitters, timers and quick-connect fittings. Drain the hose and store it.

2. 02

   Close the indoor shut-off

   Turn off the valve that feeds each outdoor faucet.

3. 03

   Open the outdoor faucet

   Let the line drain, and leave it open so any water left in the pipe has room to expand.

4. 04

   Drain any bleeder cap

   Some indoor valves have a small cap you unscrew to let trapped water out into a bucket.

5. 05

   Cover the faucet

   Fit an insulated faucet cover (tap cover) in very cold areas.

6. 06

   Insulate exposed pipes

   Pipe sleeves on lines in crawl spaces, garages and outside walls.

7. 07

   Keep the heat on when away

   DC Water advises keeping the heating above 55 °F while you are away in winter.

Frost-free sillcocks need only step 1 when they are correctly sloped. Closing and draining them as well is a sensible extra step, since the slope is hard to check from outside. In the UK, the Consumer Council for Water advises covering outside taps with a tap cover and lagging exposed pipes.

In spring, the EPA suggests checking irrigation systems for frost or freeze damage before you run them.

Vacuum breakers and backflow from garden hoses

A garden hose can pull dirty water back into your drinking water. If the pressure in the supply drops while the hose end sits in a bucket, a pool, a puddle or a hose-end sprayer full of fertilizer, that liquid can be siphoned back into your pipes. The Texas Commission on Environmental Quality calls the garden hose the most common cross connection in homes.

How to prevent it:

• Fit a hose bibb vacuum breaker on every outdoor faucet, and always before using a hose-end sprayer for pesticide or fertilizer. Many frost-free sillcocks have one built in: it is the cap or dome on top of the faucet.
• Keep the hose end out of buckets, pools, ponds, clogged gutters and drains.
• Avoid constant pressure on a vacuum breaker: manufacturer guides warn against leaving these faucets open for more than about 12 hours at a time or under timers and splitters.
• Irrigation systems need a proper backflow prevention assembly. In Texas, for example, a licensed tester must check it when it is installed, and some water providers require yearly tests. Ask your water utility what applies where you live.

A short spit of water from the vacuum breaker as you close the faucet is normal: it is letting air in so the faucet can drain.

When to call a plumber

• Water appears inside the wall, the basement or the crawl space when the faucet runs.
• The seat is damaged and the faucet needs replacing, especially if it is soldered.
• The sillcock is level or slopes inward and needs resetting.
• A pipe has frozen and you are unable to reach it safely.
• You need a backflow assembly installed or tested on an irrigation system.

Ask the plumber to confirm the slope of a new sillcock, the length of the body so the valve sits in heated space, and whether it has a built-in vacuum breaker.

Sources

Official, utility and manufacturer guidance, checked on 27 October 2026.

• US EPA WaterSense · Fix a Leak Week ↗Hose washer and pipe tape fix, worn washers and gaskets, the 3,000-gallon drip figure and spring irrigation checks.
• DC Water · Preparing pipes for winter weather ↗Removing hoses, closing inside valves, leaving the outdoor faucet open, pipe sleeves and 55 °F when away.
• Texas Commission on Environmental Quality · Cross-connection control and backflow prevention ↗Garden hoses as the most common cross connection, hose bibb vacuum breakers and irrigation backflow assemblies.
• Consumer Council for Water (UK) · Winter advice ↗Covering outside taps, lagging pipes, thawing safely without a naked flame and what to do after a burst.
• Arrowhead Brass · Frost-proof wall hydrant installation, use and repair guide ↗Why hoses left on burst frost-free faucets, the downward slope, leak locations and causes, stem length and vacuum breaker limits.