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How to Shut Off Your Water in an Emergency

The main water shut-off is the most useful valve in your house, and the one most people have never touched. It sits quietly in a garage, a utility cupboard, or outside near the front of the property, and it is the difference between a leak that runs for minutes and a leak that runs until someone arrives. Knowing where it is before an emergency is worth more than finding it during one.

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This guide covers how to shut off your water in an emergency in general terms: locating the main shut-off before you need it, turning it off safely, and what to do if you cannot find it. The guidance is simple, but it is worth reading on a dry day rather than in the middle of a flood, because the time to learn where the valve is is before the water is on the floor.

Locate the main shut-off before an emergency

The main shut-off is usually near where the water supply enters the house. In many California homes it is in the garage, in a utility cupboard, in a laundry room, or outside near the front of the property, often close to the water meter. It may be a lever handle that turns a quarter turn, or a round wheel handle that turns several times. Walk through your house on a dry day and find it, then check that it turns. A valve that has not moved in years can be stiff, and finding that out during an emergency is the worst time to learn it.

It helps to label the valve once you have found it, and to show everyone in the household where it is. A note on the inside of a cupboard door, or a tag on the valve itself, is enough. Also find the shut-off valves for individual appliances and fixtures: behind the toilet, under the kitchen sink, and behind the washing machine. Those let you stop the water to one appliance without shutting off the whole house, and they are worth knowing too. The burst pipe water damage repair page explains what happens after the water is stopped.

Shut it off if it is safe to do so

When water is coming in and you need to stop it, go to the main shut-off and turn it off, but only if you can do so safely from a dry place. Turn a lever handle until it is at right angles to the pipe, or turn a wheel handle clockwise until it stops. The water should stop flowing within moments. If the valve is stiff, do not force it with a tool that could break it. A gentle, steady turn is enough, and if it will not move, leave it and call a professional.

Do not wade through standing water to reach the shut-off, and do not reach through water to get to a valve under a sink or behind a washing machine. If the valve is on the other side of a flooded room, leave it alone. A professional can shut the water off on arrival, and the extra water that comes in while you wait is a smaller problem than an injury. The same rule applies to the power: shut it off only if you can do so from a dry place without stepping into water.

How to Shut Off Your Water in an Emergency — California water damage restoration guide

What to do if you cannot find it

If you cannot find the main shut-off, do not spend long looking for it while water is running. Check the places it is most often found first: the garage, the utility cupboard, the laundry room, and outside near the front of the property by the meter. If it is not in any of those places, stop looking and call a professional, who can shut the water off on arrival. Describe where you have already looked, so the person attending knows where to start.

If the leak is from a single appliance, such as a washing machine or a toilet, the shut-off for that appliance may be easier to find than the main valve, and turning it off stops the leak at its source. If the leak is from a pipe in a wall or a ceiling, there may be no valve nearby, and the main shut-off is the only option. In either case, do not open up walls or lift flooring to look for a valve. The valve is not behind the plaster, and opening the wall will not help.

After the water is off

Once the water is off, the immediate pressure is gone, but the water that is already in the house still needs dealing with. Move belongings away from the water where you can do so safely, take photos from the doorway without stepping into standing water, and note when the leak started and when you shut the water off. That record is useful for the visit and for any insurance claim, and it is easy to forget once the cleanup starts.

Then call a water damage professional and describe what happened: where the water is, how much there is, where you think it came from, and whether any electrics are wet. The visit will start with an inspection, then emergency water removal to get the standing water out, then drying. Homeowners in San Diego and across California face the same first steps, because the order of the work does not change with the city.

Make the shut-off part of your routine

A shut-off valve that is never touched can seize up, so it is worth turning it gently every year or so to check it still moves, then turning it back on. Do this on a dry day, when there is no emergency, and make sure everyone in the household knows where the valve is and how it works. A valve that turns easily is a valve you can rely on when it matters, and a household that knows where it is can stop a leak in minutes rather than waiting for someone to arrive.

It is also worth knowing where the water meter is, because the meter can tell you whether water is still running after you have shut the valve off. If the meter keeps moving with the valve off, the leak may be before the valve, and that is something to tell the professional when you call. A water damage restoration visit starts with an inspection, and a clear description of what you did and what you found makes that inspection faster and more useful.

Teaching the household where the shut-off is

Knowing where the shut-off is yourself is only half the job. The other half is making sure everyone else in the household knows too, because the person who finds the leak may not be the person who knows where the valve is. Show everyone in the house where the main shut-off is, and how it works, on a dry day when there is no emergency. A note on the inside of a cupboard door, or a tag on the valve itself, is enough to help someone who is looking for it in a hurry. It also helps to show everyone the shut-off valves for individual appliances and fixtures, behind the toilet, under the kitchen sink, and behind the washing machine.

It is worth checking the valve together every year or so, turning it gently to make sure it still moves, then turning it back on. A valve that has not moved in years can be stiff, and finding that out during an emergency is the worst time to learn it. A household that knows where the valve is, and that the valve turns, can stop a leak in minutes rather than waiting for someone to arrive. The check takes a minute, and it is the kind of preparation that only matters when it matters, which is exactly when you want it to work.

Key Takeaways

The main shut-off is usually near where the water supply enters the house.
When water is coming in and you need to stop it, go to the main shut-off and turn it off, but only if you can do so safely from a dry place.
If you cannot find the main shut-off, do not spend long looking for it while water is running.
Once the water is off, the immediate pressure is gone, but the water that is already in the house still needs dealing with.
A shut-off valve that is never touched can seize up, so it is worth turning it gently every year or so to check it still moves, then turning it back on.
Knowing where the shut-off is yourself is only half the job.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Burst Pipe Water Damage Repair page explains what that service covers, and the Water Damage Restoration page explains what that service covers, and the services hub lists every service in one place.

Do not use a household vacuum on standing water while you wait, and if water is still coming in, turn off the shut-off valve for that fixture where you can reach it safely.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after bringing used fixtures home.

Water damage help is available across California. See water damage restoration in Oceanview, CA for one local example, or find your town on the service areas page.