In most water emergencies, the first and most important move is shutting off your water — at the fixture or the main. Here’s where to find your shut-off valves and how to close them, before you ever need to.
Written bySteven Lockhart·Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)·Last reviewedAugust 2026 · 8 min readQuick Answer
To shut off your home’s water main, find the main shut-off valve — usually where the water line enters the home, near the meter, along an exterior wall, in the garage, or in a basement — and turn it clockwise until it stops, or a quarter-turn for a lever valve. To isolate one fixture, use its smaller shut-off valve. Knowing where yours is before an emergency is invaluable.
When a pipe bursts or a fixture floods, the difference between a minor incident and major damage often comes down to how fast you can stop the water. That means knowing, in advance, where your shut-off valves are and how to operate them. There are two levels: the main shut-off, which stops water to the entire house, and individual fixture valves, which isolate a single sink, toilet, or appliance.
How to shut off water main — Shutting off your water main is closing the main valve that controls water to the whole house — usually clockwise for a round handle or a quarter-turn for a lever — to stop water in an emergency.
It takes five minutes to locate yours on a calm day, and it is the single most useful thing you can do to be ready for a water emergency — the exact knowledge an emergency plumber wishes every homeowner had.
Stops all water to the house — usually where the line enters, near the meter, or in the garage.
Smaller valves under sinks and behind toilets isolate one fixture without cutting the whole house.
Find it, know the type, and close it.
Look where the line enters the home, near the meter, along an exterior wall, or in the garage.
A round wheel handle, or a lever (ball valve).
Turn the round handle clockwise until it stops.
Turn the lever a quarter-turn so it sits across the pipe.
At the street meter, a valve can shut off water to the property (may need a tool).
For one leak, close that fixture’s shut-off valve instead.
Dealing with a burst or leak now? Shut off the water, then call — see burst pipe repair or, for an underground leak, a main water line leak. If you’ve lost water entirely, see no water in the house.
Not sure where your shut-off is? We’ll show you and check it works — call us.
Get a Free QuoteThe value of a shut-off valve is entirely in knowing about it before the emergency. A valve you have to hunt for while water spreads across the floor is nearly useless; a valve you located, tested, and told your family about is one of the most powerful tools in your home. Spend five minutes finding your main shut-off, confirm it actually turns, and make sure everyone old enough knows where it is and how to close it. It is the rare bit of home prep that is genuinely free and genuinely valuable.
Testing matters as much as finding, because valves that sit untouched for years can seize. Gently closing and reopening your main valve once in a while keeps it working and reveals a stiff or corroded valve before you are depending on it in a crisis. The U.S. EPA’s WaterSense program encourages exactly this kind of proactive attention to a home’s water system, which prevents both waste and emergencies — and a working shut-off valve is a cornerstone of it.
If you discover your valve is seized, corroded, or leaking, that is worth fixing before you need it. We replace main and fixture shut-off valves as licensed work you can verify with the CSLB (#974600), permitting anything that requires it through the Los Angeles Department of Building & Safety. A reliable, easy-to-reach shut-off valve is the foundation everything else in a water emergency is built on.
Match the shut-off to the problem.
| Valve | Controls | How to close |
|---|---|---|
| Main shut-off | Whole house | Clockwise / quarter-turn |
| Meter valve | The property | May need a meter key |
| Fixture valve | One fixture | Clockwise |
Once the water’s off, we handle the repair — that’s how 24/7 emergency plumbing should work.
Locating and testing your shut-off valves costs nothing and takes minutes, and it can save thousands in water damage during an emergency. It’s worth confirming the main valve actually turns (old valves can seize), and that everyone in the home knows where it is. If a valve is stuck or corroded, that’s worth having replaced before you need it in a hurry.
If your main valve is seized, we’ll replace it — see how our emergency plumbing service prices flat-rate.
A homeowner's supply line bursts, and they have never located their main shut-off valve.
Because they had found and labeled it the month before, they close it in seconds and stop the flood, then call New Pro.
Minimal water damage instead of a flooded floor — because the valve was known and worked.
The Bottom Line
Shutting off your water is the first move in almost every water emergency, and the homeowners who do it fastest are the ones who found their valve on a calm day. Locate your main shut-off and your fixture valves now, make sure they turn, and make sure everyone knows where they are. It’s the cheapest insurance in plumbing.
It’s usually located where the main water line enters your home. Common spots are near the water meter (often in a box near the street or sidewalk), along an exterior wall on the side of the house facing the street, in the garage, or in a basement or crawlspace. In warmer climates like Southern California it’s frequently outside near the meter or on an exterior wall. It’s worth finding yours now and making sure everyone in the household knows where it is.
It depends on the valve type. A round wheel-style handle is closed by turning it clockwise until it stops — righty-tighty. A lever-style (ball valve) is closed by turning the lever a quarter-turn so it sits across, or perpendicular to, the pipe. At the street meter there may also be a valve that shuts off water to the whole property, though that one sometimes requires a meter key or wrench. Closing the valve stops water flow to the house.
For the common round wheel-handle valve, turn it clockwise (to the right) to close and stop the water. The old saying righty-tighty, lefty-loosey applies. For a lever or ball valve, you don’t turn a wheel — you rotate the lever a quarter-turn until it’s perpendicular to (across) the pipe, which is the closed position; when the lever is parallel to the pipe, it’s open. If a valve is hard to turn, don’t force it to the point of breaking it.
Match it to the problem. If a pipe has burst, water is flooding, or you can’t tell where the leak is, shut off the main to stop all water fast. If the leak is clearly at a single fixture — under one sink, behind one toilet — you can close just that fixture’s smaller shut-off valve, which stops the leak while leaving water available to the rest of the house. When in doubt in an emergency, shutting the main is the safe choice.
Older valves can seize or corrode from years of not being used, and forcing a stuck valve can break it and cause a worse leak. If your main valve won’t turn, don’t force it — in an emergency, use the meter valve or call your water utility to shut off at the street, and have the seized valve replaced. It’s actually a good idea to test your main valve periodically by turning it off and on so it doesn’t seize, and to replace it proactively if it’s stiff.
Written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Guidance follows U.S. EPA, CSLB, and LADBS sources where cited. Any figures reflect New Pro Plumbing's flat-rate practice and West LA conditions, not a quote — we confirm pricing in writing before any work begins.
Last reviewed: August 2026.
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