If the water is actually dripping from behind the siding and running down the wall there s a good chance that you have a frost free hose bibb and there may be a defect in it behind the wall and the slightest bit of back pressure when a garden hose is connected is causing the leak to show up.
Hose bib leaking behind siding.
Repairing a dripping outdoor spigot is often at the bottom of a homeowner s to do list since the leak is outside the house.
Another common problem on outside spigots is leaking around the valve stem when the water is turned on.
Shut off the water begin by shutting off the water to the hose bib.
Many homeowners will ignore the leaking unless it is particularly dramatic seeing it a minor annoyance and not something to be concerned about.
It s generally easiest to address both possible causes of leaking when servicing a hose bib the stem washer and the handle packing string.
Usually you will find a shutoff valve inside the house controlling the water flow to the outdoor hose bib.
One of the most common problems homeowners have with their hose bib or the exterior faucet that connects a garden hose to water is leaking.