There s an easy way to fix it and you may want to give it a try.
Water valve under sink won t shut off.
Prevent shutoff valves from freezing or becoming stiff by turning the valve on and off twice a year.
Support see jane dri.
This tip if followed will work 85 percent of the time.
If the valve won t turn off the water or shut off completely it is likely tha.
If your water supply valve is leaking you may not need to replace it.
Here is a video showing you how to handle a situation in which the water shut off valve or angle stop does not want to close or shut off.
A water supply valve that won t work or leaks when it is shut can be repaired.
If there s buildup visible on the water valve pour a little white vinegar on the valve and scrub the buildup away with a wire brush.