Why Your Outdoor Spigot Leaks Only When the Hose Is On

An outdoor spigot that leaks only when the hose is on is easy to miss. The faucet looks fine until pressure builds, then water sneaks out behind the siding, in the basement, or inside the wall.

Where to look first

Turn the hose on, then check inside the basement or crawlspace where that pipe enters the home. Look for dripping, staining, damp insulation, or a musty smell.

Common causes

• A cracked frost-free hose bib from winter damage.
• A worn washer or packing nut.
• A loose connection behind the wall.
• A pipe that split but only leaks under pressure.

Do not ignore it

Outdoor faucet leaks can feed water into framing, insulation, and foundation areas. If you see indoor dripping, stop using the hose and book leak repair.

Good CT towns to be extra careful in

Older homes across West Haven, Wallingford, Meriden, North Haven, and shoreline towns often have mixed old and newer plumbing. That is where small surprises show up.

FAQs

Why does my hose bib leak only when the hose is attached?

The hose adds back pressure. That pressure can expose a cracked valve body, loose connection, or damaged washer that does not leak when the faucet is off.

Can an outdoor faucet leak cause indoor water damage?

Yes. If the leak is behind the wall or inside the basement ceiling, it can damage wood, insulation, drywall, and foundation-adjacent areas.

Should I replace or repair a leaking hose bib?

Small packing or washer leaks may be repairable. A cracked frost-free spigot usually needs replacement.