The single most useful thing you can know in a plumbing emergency is where your main water shutoff valve is and how to close it. It takes two minutes to find on a normal day and can save thousands of dollars in damage on a bad one.
Where the main shutoff is usually located
The main shutoff valve is typically located where the water supply line enters your home. Common spots include:
- In the basement or crawl space, on an interior wall facing the street
- In a utility room, garage, or near the water heater
- Outside near the foundation or in an in-ground box in warmer climates
- Near the water meter, which may be at the curb or in a covered pit
How to shut it off
There are two common valve types. A gate valve is a round wheel you turn clockwise several full turns until it stops. A ball valve has a lever handle you turn a quarter turn so it sits across, or perpendicular to, the pipe.
If a valve is stiff, turn it slowly and steadily rather than forcing it. Old gate valves can seize up, which is a good reason to test yours occasionally.
Test it before you need it
Find your valve today and make sure you can turn it. Show everyone in the household where it is. If your valve is stuck, leaking, or you cannot find it, a plumber can locate it, free it, or replace it so it is ready when it matters.
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