Quick Answer:

If the faucet only drips when a hose is connected, start by shutting off any dedicated exterior shutoff, remove the hose and inspect the hose washer and spigot threads. Often the fix is a correctly sized washer and careful hand-tightening followed by a small wrench turn. If the leak comes from the spigot stem or you see wetness inside the wall, call a professional.

Why This Happens

Common causes when a hose is involved:

• Worn, missing, or wrong-size washer in the hose end so the seal fails when connected.
• Damaged or cross-threaded spigot threads that prevent the hose from sealing snugly.
• Corrosion or cracks in the spigot that only show under the added pressure of a hose attached. For related issues when pressure affects the spigot, see Hose bib leaks under pressure.
• Leaks at the spigot stem or inside the wall that can look like a hose-connection problem but are actually plumbing behind the fixture.

Step-by-Step What to Do

1. Shut off any dedicated exterior shutoff

• Before you touch anything, locate and close the exterior shutoff valve if your home has one (often in a basement, crawl space, or utility closet). This prevents water while you inspect.

2. Remove the hose and inspect the hose washer and spigot threads

• Detach the hose and check the rubber washer inside the hose coupling. If it’s cracked, flattened, or missing, replace it.
• Look at the spigot threads for nicks, grit, or corrosion that could prevent a seal.

3. Dry the spigot and hand-thread the hose to check for cross-threading

• Use a rag to dry the spigot threads so you can see where water appears when you test.
• Start the hose onto the spigot by hand. If it feels like it’s binding or not turning smoothly, back it off and realign—don’t force it. This checks for cross-threading or misalignment.

4. Reinstall a correctly sized washer and tighten properly

• Fit a new, correctly sized rubber washer into the hose coupling. Make sure it sits flat.
• Hand-tighten the hose until snug, then finish with about a 1/4–1/2 turn using an adjustable wrench. This slight wrench turn compresses the washer enough for a seal without damaging threads.
• If you recently replaced the washer and the leak continues, consider that this can be a different problem—see Leak after replacing hose washer.

5. Retest under normal flow to confirm source

• Open the exterior shutoff and run water at normal flow (not full blast). Watch carefully where the water appears:
• If water comes from the hose-to-spigot connection, the washer or threads are still the issue.
• If water appears at the spigot stem or behind the mounting plate, the leak is in the spigot assembly or inside the wall and needs professional attention.

What Not to Do

• Avoid overtightening the hose—excessive force can strip threads or crush the washer and make the leak worse.
• Don’t stuff extra material (like rags, putty, or improvised washers) into the hose end; these usually fail and can hide the real problem.
• Do not attempt aggressive repairs behind the wall yourself. Call a pro when the leak persists at the spigot stem or you see water inside the wall cavity behind the spigot.

When to Call a Professional

Contact a licensed plumber if any of the following apply:

• The leak continues after replacing the washer and confirming proper threading and tightening.
• Water is coming from the spigot stem, the base where the spigot meets the wall, or you notice moisture or water staining inside the wall cavity. These signs indicate a failing valve or plumbing inside the wall.
• The spigot is corroded, cracked, or the shutoff valve does not stop water reliably.

Safety Notes

• Turn off water before disassembling connections to avoid surprises.
• If you must shut off the main water to work, drain nearby faucets first to relieve pressure.
• Wear gloves to protect your hands from sharp threads or debris.
• Do not use an open flame or solder near wall cavities or insulation. Leave pipe replacement or inside-wall work to a professional.

Common Homeowner Questions

• Why does it drip only when the hose is attached? — The hose connection adds pressure and seals differently, revealing a bad washer, damaged threads, or a misaligned hose coupling.
• Can I use plumber’s tape on the hose threads? — Plumber’s tape is for pipe threads, not the hose coupling; replacing the washer and aligning threads is the proper fix.
• How do I know the correct washer size? — Match the hose coupling diameter and thickness; washers are inexpensive and sized by inside diameter—bring the old washer to a hardware store if unsure.

More in this topic

For more related fixes and similar symptoms, see Outdoor Spigot Leaks Under Load.