How to Find and Use Your Water Shut-Off Valve

When water is escaping inside a home, the amount of damage depends almost entirely on how long it runs. A plumber may be thirty minutes away. Closing a valve takes fifteen seconds. Homeowners who know where their shut-off is routinely turn a five-figure restoration job into a repair.

The problem is that people usually go looking for the valve while water is running, in a dark crawlspace, in the middle of the night. Find it now instead.

Location depends on climate and construction, but a few places cover most homes.

A valve that hasn't moved in fifteen years can be seized — and you don't want to discover that during an emergency. Turn it fully closed, check that a faucet runs dry, then reopen it. If it won't move, don't force it: old valves snap, and a snapped valve is a much larger emergency. Have a plumber replace it on a normal weekday instead.

While you're there, take a photo of the valve and its location, and show everyone in the household. Labeling it with a tag costs nothing.

Most toilets, sinks, and appliances have their own shut-off valve nearby. For a contained problem — a dripping supply line under a sink, a running toilet — closing that one valve is enough and leaves the rest of the house with water. For anything uncontrolled, or if you're not sure where the water is coming from, go straight to the main.