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How to shut off your water main in an emergency
To shut off your water in an emergency, first try the fixture's local shutoff valve; if that isn't enough, close your home's main shutoff — usually inside the garage, in a utility closet, or where the supply line enters the house — or the street-side meter valve at the curb. Find and test all three before an emergency, because a valve you can't locate or turn is useless when a pipe is spraying.
The difference between a minor incident and a flooded home is often the sixty seconds it takes to stop the water. Yet most people have never located their shutoff valves, let alone tested them. This guide covers the three places you can stop the flow, how to operate each, and the five-minute check you should do today.
Three places you can stop the water
Water can be shut off at three levels, from the single fixture up to the entire property. Knowing which to use saves time and avoids shutting off the whole house when you don't need to.
| Shutoff | Where it is | When to use it |
|---|---|---|
| Fixture valve | Under sinks, behind toilets, at the water heater and appliances | A leak isolated to that one fixture |
| Home main shutoff | Garage, utility closet, or where the supply line enters the house | A burst pipe or any leak you can't isolate to one fixture |
| Street meter valve | In the meter box at the curb or property line | The house main is stuck, or the leak is between the meter and the house |
Find and test your shutoffs today
Do this once, calmly, so that in an emergency it's muscle memory. It takes about five minutes and can save thousands.
- 1
Locate the home main
In Arizona, it's most often in the garage on the wall the water line enters, in a utility closet, or on an exterior wall near the front hose bib. Follow the main line in from the meter if you're unsure.
- 2
Identify the valve type
A ball valve has a lever handle — a quarter turn shuts it. A gate valve has a round wheel you turn clockwise several times. Older gate valves can seize, so test yours.
- 3
Test that it actually closes
Turn it off, then open a faucet to confirm the flow stops. Turn it back on. A valve that won't budge or won't fully stop flow should be replaced before you need it.
- 4
Locate the street meter valve
Open the meter box at the curb. The valve beside the meter usually needs a meter key or a wrench — keep one accessible. This is your backup if the house main fails.
- 5
Show everyone in the household
A shutoff only helps if whoever is home can operate it. Make sure family members and tenants know where it is.
Arizona-specific valve notes
Older Valley homes — think historic North Central Phoenix or mid-century Arcadia — frequently have aging gate valves that corrode and seize, so the wheel either won't turn or won't fully close. If yours is stiff, don't force it during an emergency; go to the street meter instead, and have a plumber replace the main valve with a modern ball valve when things are calm.
Freezing is rarely the issue here that it is in colder climates, but heat, mineral scale, and age all take a toll on valves. The street meter valve almost always requires a meter key or a large wrench — keep one where you can grab it, because hunting for a tool while water sprays defeats the purpose.
The five-minute check that prevents a flooded home
Right now, locate your home's main shutoff, confirm it turns and fully stops the water, and make sure a meter key or wrench is accessible for the street valve. A seized valve you discover during a burst pipe is worse than no plan at all — test it while the water's calm.
After the water's off
Shutting off the water stops the source, but it doesn't address what already escaped. Once the flow is stopped, cut power to any affected area if water is near outlets, document the scene, and begin extraction and drying — the mold clock starts the moment materials get wet, not when you find the leak.
For anything beyond a small, contained clean-water spill, get a professional assessment. The faster drying begins after the water is off, the smaller the eventual loss.
Common questions
- Where is my main water shutoff?
- In most Arizona homes it's in the garage where the supply line enters, in a utility closet, or on an exterior wall near the front hose bib. If you can't find it, follow the main line from the street meter box toward the house. Locate it before an emergency, not during one.
- My shutoff valve won't turn — what do I do?
- Don't force a seized valve during an emergency; you can break it and make things worse. Go to the street meter valve at the curb instead (keep a meter key handy). Afterward, have a plumber replace the stuck valve — often an old gate valve — with a modern quarter-turn ball valve.
- Do I need a special tool to shut off the water?
- The house main usually turns by hand — a lever on a ball valve or a wheel on a gate valve. The street meter valve typically requires a meter key or a large wrench. Keep that tool somewhere accessible so you're not searching for it while water is spraying.
- Should I shut off the water heater too?
- If the leak involves or is near the water heater, yes — close its cold-water inlet valve and cut its power (breaker for electric, gas control valve for gas) so it isn't heating an empty or draining tank. For leaks elsewhere, shutting the whole-house main already stops supply to the heater.
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