Usually you will find a shutoff valve inside the house controlling the water flow to the outdoor hose bib.
Hose bib leaking behind siding.
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.
It s generally easiest to address both possible causes of leaking when servicing a hose bib the stem washer and the handle packing string.
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.
But left unchecked it doesn t take long for even a small leak from a hose bibb to waste hundreds of gallons of water.
Https amzn to 31ad1os this video will walk you through how to fix a common source of water leaks in.
Shut off the water begin by shutting off the water to the hose bib.
Another common problem on outside spigots is leaking around the valve stem when the water is turned on.