Cause 1: Simple Washer Wear
The most common and least concerning cause of a leaking hose bib is simply a worn rubber washer inside the valve mechanism — over years of regular use, opening and closing the valve gradually wears down this small component until it no longer creates a complete, watertight seal when closed.
Why This Is a Straightforward Fix
This is an inexpensive, relatively quick repair — either a confident DIYer comfortable with basic hand tools or a plumber can typically resolve this within a short visit, and it doesn't indicate any broader problem with the plumbing beyond the single worn component.
Cause 2: Freeze Damage — Often Discovered Well After It Happened
If a garden hose was left connected to the bib over winter, and the bib isn't a frost-free design, water trapped in the section of pipe between the outdoor valve and the point where it enters the heated interior wall can freeze during a hard freeze. As that trapped water freezes and expands, it can crack the pipe internally — but critically, this crack often isn't discovered until the following spring, when you reconnect a hose and turn the water back on, only to find it leaking or spraying from a point that wasn't visible or accessible to inspect over the winter.
Why a Hose Left Connected Defeats Even Frost-Free Protection
Frost-free hose bibs are specifically designed with their actual shutoff point set further back, inside the heated wall, precisely to avoid this freeze scenario — but this design only works if water can properly drain out of the exposed exterior portion after each use. A hose left connected traps water in that exterior section regardless of the frost-free design, effectively canceling out the protection the design is meant to provide.
Diagnosing Which Cause Applies to Your Situation
A leak that's been present and gradually worsening over an extended period, without any specific triggering event, points toward simple washer wear. A leak that appears suddenly right when you first reconnect a hose and turn the water on for the season — particularly in spring, after a winter with hard freezes — points strongly toward freeze damage that occurred months earlier but is only now becoming apparent.
Repair Approach for Each Cause
Washer Replacement
A straightforward parts swap, typically completed quickly, restoring a proper seal without needing to address anything beyond the single worn component.
Freeze Damage Repair
This typically requires replacing the damaged section of pipe, and is a good opportunity to consider upgrading to a frost-free bib if the home doesn't already have one — addressing both the immediate repair and reducing the risk of the same freeze-related issue recurring in future winters.
Preventing This Before Next Winter
Always Disconnect Hoses Before the First Freeze
This single habit — disconnecting and fully draining garden hoses before Arlington's first hard freeze, typically by late October — prevents the great majority of freeze-related hose bib damage, even on a standard (non-frost-free) bib.
Consider a Frost-Free Upgrade
For homes still running original, non-frost-free bibs, upgrading during a routine service visit provides meaningfully better long-term freeze protection, particularly valuable for households that might occasionally forget to disconnect a hose during a busy fall season.
Insulated Covers as a Secondary Measure
Foam or fabric hose bib covers add an extra layer of protection during hard freezes, though they work best as a supplement to properly disconnecting hoses rather than a substitute for it.
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Frequently Asked Questions
Should I disconnect garden hoses every single winter, even with a frost-free bib?
Yes — leaving a hose attached, even to a frost-free model, can trap water in the exposed section and defeat the freeze protection the design is meant to provide.
Is a leaking hose bib generally urgent to fix?
Rarely an emergency, but worth addressing before the next freeze to avoid worse pipe damage developing inside the wall over another winter.
How do I know if my current hose bib is frost-free or standard?
Frost-free bibs typically have a noticeably longer stem extending back into the wall compared to standard models — a plumber can confirm which type you have during a visit if you're unsure.
Can I repair a frozen and cracked hose bib myself?
Simple washer replacement is a reasonable DIY task for a comfortable homeowner; freeze-related pipe damage often benefits from professional repair given it may involve accessing pipe inside the wall.
Why does my hose bib only leak when the hose is actually connected and running?
This pattern can suggest the leak is at the hose connection itself rather than the bib's internal valve — worth checking the connection and hose washer before assuming the bib itself needs repair.
Is it worth upgrading all my hose bibs to frost-free models at once?
For homes with multiple standard bibs and a history of freeze issues, addressing them together during one visit is often more efficient than handling them one at a time as each eventually fails.