Home Improvement and DIY
Know where it is and how to close it safely when water starts spreading.
A burst supply line can flood a room quickly. Find the main water shutoff valve before an emergency, so you know where to go instead of searching while water spreads.
Look where the water service enters the home and follow the larger pipe. Check a basement, crawl space, utility room, garage, or a closet near the water heater.
Turn a wheel handle clockwise, or rotate a lever one-quarter turn until it crosses the pipe. Stop if the valve resists, leaks, or looks corroded; forcing it can cause damage.
A gate valve usually has a round wheel handle; a ball valve has a lever. Their operation differs, so identify the valve before turning it and do not force an unfamiliar one.
If the indoor shutoff cannot stop an urgent leak, call your water utility about closing service at the meter. Ownership and rules vary, and a curb stop may need a special tool.
After closing the main, open a faucet to relieve pressure and see whether water still flows. Stay clear of standing water near energized equipment; leave and call for help if needed.
Reopen the main gradually to limit pressure surges. Turn a lever parallel to the pipe or a wheel counterclockwise, then check exposed pipes and fixtures for leaks.
Call a plumber if the valve is stuck, damaged, leaking, inaccessible, or uncertain. Contact the water utility if the only usable shutoff is at the meter or street.
Turning off water while the home is vacant can reduce supply-line leak risk. First check whether shutting off water affects heating, fire protection, or other systems.
Closing the main stops new water from entering the home, but it does not drain water already in the pipes. Open a faucet to relieve pressure after the shutoff.
Keep reading