How to Turn Off Your Home's Main Water Shutoff Valve

In most homes, the main shutoff valve is located where the water line enters the house... commonly in the basement, a utility closet, near the water heater, or in a crawl space, usually on an exterior-facing wall closest to the street. In homes without basements, it's sometimes in the garage or a dedicated utility box outdoors near the foundation.

If you can't find it after a reasonable search, there's often a second option outside: a street-side shutoff, usually in a small round or rectangular cover in the yard or sidewalk near the curb. That one typically needs a special tool (a meter key or long-handled wrench) and is technically the utility's responsibility, but it works as a backup if the indoor valve is inaccessible or broken.

A gate valve looks like a wheel or round handle. Turn it clockwise, and keep turning until it stops... it may take several full rotations. Older gate valves can be stiff or even seize up if they haven't been touched in years, which is exactly why it's worth testing yours now, not during an emergency.

A ball valve has a lever-style handle. A quarter turn (90 degrees) fully closes it. These are generally more reliable long-term than gate valves and don't seize up the same way.

Once you've found your valve, turn it off and back on, once, to confirm it actually moves and doesn't leak around the stem when operated. Old gate valves in particular can develop a slow leak around the handle after being turned for the first time in years... better to discover that on a calm afternoon than during an actual emergency.

If your valve is seized, extremely stiff, or leaks when operated, get it replaced proactively. A functioning shutoff valve is genuinely important safety equipment, not a nice-to-have.

The main shutoff controls all water entering your home, hot and cold, at every fixture. It won't drain water already in your pipes or water heater tank, but it stops any more from coming in, which is what actually limits damage from a burst pipe or major leak.

After shutting it off during an emergency, open a faucet (ideally the lowest one in the house) to relieve pressure and drain remaining water from the lines, which reduces further dripping from the break itself.

Most fixtures... toilets, sinks, the washing machine, the water heater... have their own local shutoff valve, usually a small oval handle on the supply line itself. For a leak isolated to one fixture, using the local shutoff is faster than running to the main and doesn't cut water to the rest of the house. Worth knowing where these are too, especially for the washing machine and water heater, which are common sources of slow leaks that go unnoticed.