A leaking outdoor faucet almost always comes from one of four places: a worn washer, a loose or dry packing nut, a failing anti-siphon cap, or a damaged frost-free body behind the wall. Where the water shows up tells you which one. A drip from the spout points to the washer or valve seat. A leak at the handle points to the packing. Water inside the wall means stop and call a licensed plumber.
This guide shows you how to read the leak, what basic fixes are realistic, how to shut the water off safely, and when a repair no longer makes sense.
TL;DR
- Note where the water appears: spout, handle, vacuum breaker cap, hose connection, or inside the wall. Each has a different cause.
- Handle leaks often stop after a small packing nut adjustment or new packing. Spout drips usually mean a worn washer.
- A leak behind the wall, a cracked body or a worn valve seat usually means replacing the whole hose bib.
- Shut off the water first, and fix or replace before freezing weather arrives.
- Hidden leaks can waste water and damage framing, so have a licensed plumber look at anything you cannot see.
Table of Contents
- Where is the water coming from?
- How to shut off the water to an outside faucet
- Basic fixes for common leaks
- Frost-free hose bibs: what to know
- When to stop and replace
- What does a plumber charge to fix or replace an outdoor faucet?
- Need a hand with the faucet?
- A short checklist before cold weather
- FAQ
- Sources
Where is the water coming from?
Start by watching the faucet with the hose removed. Then turn it on and off and note what leaks and when.
| Where it leaks | When | Likely cause | Usual fix |
|---|---|---|---|
| Spout, handle closed | Always | Worn stem washer or damaged valve seat | Replace washer, or the faucet if the seat is worn |
| Around the handle | When open, or always | Loose packing nut, worn packing or O-ring | Tighten, then replace packing |
| Cap on the anti-siphon device | When open | Debris or worn vacuum breaker | Clean, or replace the breaker |
| Hose connection | When hose is on | Worn hose washer, loose fit | New hose washer, tight connection |
| Inside or behind the wall | When open | Cracked pipe or failed frost-free stem | Professional repair or replacement |
This Old House describes the same split: leaks at the bonnet are often a damaged O-ring, loose bonnet nut or worn packing, while a spout drip with the handle off usually comes from a damaged valve seat, loose packing nut or worn washer at the base of the stem. Its plumbing expert Richard Trethewey estimates that 75 or 80% of outdoor spigots leak when turned on, and notes that the fix is relatively simple.
A leak at the hose connection
If water sprays where the hose meets the spigot, the culprit is usually the hose, not the faucet. The EPA’s WaterSense guidance advises replacing the nylon or rubber hose washer and making a tight connection with pipe tape and a wrench.
A leak at the handle
This is the most common complaint. Water creeps out around the stem when the faucet is on. The packing, a small seal around the stem, has dried out or loosened. The Saving Water Partnership says to try tightening the packing nut with a wrench first, and to remove the valve stem assembly if that fails.
A drip from the spout
When the faucet is closed and water still comes out, the seal at the end of the stem is not closing. Family Handyman explains that on a frost-proof faucet the washer sits on the end of the long stem. If the drip returns soon after a new washer, the valve seat is worn and the whole faucet should be replaced.
A leak behind the wall
Frost-free faucets have a long stem so the shutoff sits inside the warm part of the house. If the pipe or stem fails, water runs into the wall cavity when you open the faucet. You may see a stain on an interior wall, a damp basement ceiling or a hissing sound. Our guide on what to do about a wall leak covers the first moves. A wall leak is not a tightening job.
How to shut off the water to an outside faucet
Do this before any repair. The right valve depends on your home.
- Interior shutoff. Most outdoor faucets have a dedicated shutoff valve inside the home, and the Philadelphia Water Department advises using it and leaving the outside faucet open to drain the remaining pipe.
- Separate outdoor valve. Portland’s water bureau says to turn the water off there, then open each outdoor spigot to drain what is left.
- House valve. The Sacramento Suburban Water District explains that a gate valve is turned clockwise until the water stops, and a ball valve takes a quarter turn clockwise.
If you cannot find a shutoff for the faucet, shut off the main and call us. Do not open the faucet walls yourself.
Basic fixes for common leaks
These are for a faucet in decent shape. If you would rather not take it apart, a licensed plumber can do each in a short visit.
Tighten or replace the packing
The Spruce describes the sequence: turn off the water, remove the handle, packing nut and valve stem, replace a hardened, cracked or deformed stem washer and the packing string, then reassemble and test. If the handle still weeps, tighten the packing nut slightly.
On a frost-proof model, Family Handyman advises tightening the retaining nut under the handle first. If that fails, shut off the water, remove the nut and fit a packing gasket from a repair kit that matches the faucet brand. If it still leaks, the stem may be the problem and the faucet should be replaced.
Replace the stem washer
A new compression washer lets the faucet close fully. Refreshed packing string stops seepage around the handle, per The Spruce. Match the washer size to the old one and replace it with the stem out of the faucet.
Fix a leaking anti-siphon device
An anti-siphon hose bib has a vacuum breaker, a small backflow-prevention device threaded onto the outlet. It lets water flow out and closes if pressure drops, so dirty water cannot be drawn back into your pipes. SupplyHouse explains that a screw-on model is replaced by closing the faucet, removing the hose, cleaning the threads and threading on the new one clockwise until snug. Hand-tight is usually enough.
Before replacing it, try cleaning. NIBCO’s technical bulletin says leakage usually means debris in the poppet channel or on the sealing gasket. Disassemble, rinse with clean water, and replace the poppet if it keeps leaking.
What a drip costs you
The EPA’s Fix a Leak Week fact sheet states that a faucet dripping once per second can waste more than 3,000 gallons a year. An outdoor drip also keeps soil against the foundation wet. You can check for a hidden leak by reading the water meter before and after two hours with no water use, as the EPA recommends. Our guide to detecting water leaks at home walks through it.
Frost-free hose bibs: what to know
A frost-free hose bib, also called a frost-proof sillcock, has its valve seat several inches inside the house, so the water in the exposed part of the pipe can drain out. That design only works if the hose is removed in winter. A hose left attached traps water in the barrel, which can freeze and split the pipe. You often do not see the damage until spring, when the faucet is turned on and water pours into the wall.
The frost-free body also has to slope slightly downward to drain. If a faucet leaks from the spout after a freeze, treat it as damaged. Our post on how to winterize outdoor faucets lists the steps: disconnect hoses, shut off the interior valve, and drain the line. For related burst-pipe prevention, see these ways to prevent pipe bursts.
When to stop and replace
Repair has limits. The Spruce notes that very old faucets can have body cracks, serious valve-seat damage, corrosion, cold-weather damage or built-up rust and minerals, and that visible wear means replacing the whole hose bib or wall hydrant.
Call a licensed plumber when:
- Water appears inside the wall, on a basement ceiling or under the floor.
- The faucet drips again soon after a new washer.
- The handle will not turn, or the stem snaps.
- The faucet or pipe is corroded, cracked or split after a freeze.
- You cannot find or operate the shutoff valve.
- The faucet is on a commercial building or a rental portfolio, where an unnoticed leak is costly.
What does a plumber charge to fix or replace an outdoor faucet?
Prices vary by region and access. National figures from cost-estimating sites give a rough picture. Plumbing Tips Today reports 2024 national averages of $150 to $500 for hose bib installation or replacement, with most jobs near $275, and $75 to $150 for a minor washer repair. Cost to Renovate puts a replacement at the same location at $75 to $200, while a new location adds $100 to $250 in labor and materials.
These are estimates, not our prices. We give free quotes, and our guide to faucet repair costs explains why quotes differ.
Do you need a plumber? For a washer or packing swap on an accessible faucet, many handy homeowners do it themselves. For a frost-free faucet, a faucet with no shutoff, or a new location that needs piping, hiring a licensed plumber saves the risk of a hidden leak.
Our view from the truck
Most outdoor faucet calls we see start the same way: a small drip people ignore all summer. Then the first cold snap turns it into a split pipe or a wet wall.
Our advice is to treat any spout drip or wall-side moisture as the signal to act. A washer or packing repair is quick. A full replacement of a worn frost-free faucet is a cleaner answer than patching a bad valve seat over and over.
We are licensed and insured, we follow industry standards, and we explain the problem and the price before we start. If the faucet is the tip of a bigger issue, such as old supply lines, we will tell you what we see and show you the options.
Serghei
Need a hand with the faucet?
PSV Plumbing Inc is a local, licensed and insured plumbing company based in Burbank. We handle outdoor faucet leaks along with bathroom and fixture work, repiping, drain cleaning and more, for homes and commercial properties. We offer free quotes.
If a leak is tied to old supply lines, see our repiping and remodel services, or contact us through our site for a free quote on the faucet.
A short checklist before cold weather
- Remove and store hoses.
- Check each faucet for drips with the handle closed.
- Tighten a loose packing nut or schedule a repair.
- Close the interior shutoff and open the outside faucet to drain.
- Replace any faucet that is cracked, corroded or drips after a washer change.
For other repairs, our overview of common plumbing repairs can help you decide what to schedule.
FAQ
Why is my outside faucet leaking when the water is off?
Usually the stem washer is worn or the valve seat is damaged. The washer sits at the end of the stem and seals the water. If a new washer does not hold for long, the seat is worn and the faucet should be replaced.
Why does my outdoor faucet leak around the handle?
The packing around the stem is loose or worn. Shut off the water and try a small tightening of the packing nut. If water still seeps out, replace the packing or packing string, or have a plumber do it.
Can I replace an anti-siphon hose bib vacuum breaker myself?
Often yes. A screw-on vacuum breaker threads onto the faucet outlet, and hand-tight is usually enough, per SupplyHouse. If the faucet body itself leaks, call a plumber.
How do I know if the leak is inside the wall?
Look for dampness, stains or a hissing sound on the interior side of the wall, or a drop in pressure at the faucet. A meter check with all water off can confirm a hidden leak. Then call a licensed plumber.
Sources
- This Old House: How To Fix a Leaky Hose Spigot
- EPA WaterSense: Fixing Leaks at Home
- Philadelphia Water Department: Cold Weather Solutions
- Portland.gov: Prepare your plumbing for winter weather
- Sacramento Suburban Water District: How to Turn Off Your Water
- The Spruce: How to Fix a Leaky Hose Bib
- Saving Water Partnership: Outdoor Faucet Leaks
- Family Handyman: How to Fix a Leaking Frost-Proof Faucet
- SupplyHouse: Install or Replace a Hose Bib Vacuum Breaker
- NIBCO: Anti-Siphon Repair Technical Bulletin
- EPA: Fix a Leak Week Fact Sheet
- Plumbing Tips Today: Hose Bib Plumber Cost
- Cost to Renovate: Outdoor Faucet Installation Cost
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