How to Shut Off Water, Gas, and Electricity in an Emergency
In a flood, leak, or gas scare, seconds matter. Learn to locate and operate every utility shutoff in your home — water, gas, and electricity — before you ever need to.
When water is pouring through a ceiling or you catch the rotten-egg smell of gas, you have seconds, not minutes — and that is the worst possible time to be hunting for a valve you've never touched. The single best emergency-preparedness habit any homeowner can build is knowing exactly where your three main shutoffs are, that they actually work, and how to operate each one. Learn it once, calmly, and you'll never have to learn it in a panic.
Quick answer: Shut off water at the main valve where the line enters the house (turn a wheel valve clockwise, or a lever valve a quarter turn). Shut off gas only in a real emergency by turning the meter valve a quarter turn with a wrench — and never turn it back on yourself. Shut off electricity at the panel by switching the branch breakers off, then the main breaker. Above all: if there's gas or fire, get everyone out first and operate a shutoff only if it's safe on your way out.
Your three shutoffs at a glance
| Utility | Where it usually is | How to shut it off | When to do it |
|---|---|---|---|
| Water | Where the main line enters the house — near the water heater, an interior wall facing the street, or an outdoor box | Wheel valve: turn clockwise until it stops. Lever valve: quarter turn, perpendicular to the pipe | Burst pipe, failed water heater, any flood you can't isolate |
| Gas | At the gas meter, usually outside, on the inlet pipe | Wrench: turn the rectangular nub a quarter turn until crosswise to the pipe | Emergency only — strong gas smell, fire, or after a major earthquake |
| Electricity | The service panel (breaker box) — garage, basement, utility closet, or exterior wall | Branch breakers off first, then the large main breaker | Electrical fire, water rising near outlets/panel, or before working on wiring |
Think of these in the order safety demands: gas and fire force you out of the building first, water damage gives you a little more time, and electricity is the one you kill to make a flooded or burning area safer — but only if you can reach the panel without standing in water.
Shutting off the water
Water is the shutoff you're most likely to use, because plumbing failures are the most common home emergency. A burst supply line or split pipe can release hundreds of gallons an hour, and water finds its way into walls, floors, and ceilings fast.
Find the main valve before you need it
Don't go looking for the valve mid-flood. Locate it now. The most common spots:
- Near the water heater or wherever the main line enters the house.
- Along an interior wall facing the street, often in the basement or garage.
- In a ground-floor utility closet.
- Outside in a covered ground box near the curb (this one may need a meter key).
The reliable trick: find your water meter and follow the pipe into the house. The first valve on that line is usually your main water shutoff. For a full walkthrough, see how to shut off the water to your house.
The two valve types
- Wheel (gate) valve: turn it clockwise — righty-tighty — until it stops. These stiffen with age, so test yours occasionally so it isn't seized when you need it. FEMA's guidance is blunt: if the valve is rusted open or won't close all the way, replace it now, not during a flood.
- Lever (ball) valve: turn the handle a quarter turn until it's perpendicular to the pipe. Quick, reliable, and the better choice if you ever upgrade.
After shutting it off, open a faucet on a lower level to confirm the water stops and to drain pressure from the pipes.
One detail worth knowing: shutting the main house valve (not the street valve at the curb) traps the water already in your water heater and toilet tanks — useful drinking water in a disaster. After certain disasters, cracked lines can also contaminate your supply, so leave the water off until authorities say it's safe to drink.
Don't forget the fixture shutoffs
Small valves under sinks and behind toilets let you stop one fixture without killing water to the whole house. For a single leaking fixture, use those instead — and know where your supply lines and their shutoffs are, since braided hoses to toilets, faucets, and washers are a top cause of indoor floods. If a pipe has already burst, our burst pipe guide walks through the next steps.
Shutting off the gas
Gas is different from the other two: you shut it off only in a genuine emergency, and you don't turn it back on. Natural gas and propane are explosive, so the bar for closing the valve is high and the rules around it are strict.
When to shut off the gas
Shut off the gas if you:
- Smell gas — that deliberate rotten-egg or sulfur odor (utilities add a chemical called mercaptan to otherwise odorless gas).
- Hear a blowing or hissing sound near a gas line, meter, or appliance.
- Have a fire in or threatening the home.
- Have just been through a major earthquake or similar disaster that may have damaged lines.
In any of these cases, get everyone out first. Open a window only if it's already on your path out, leave the door open behind you, don't touch any switches or flames, and call your gas company and 911 from outside or a neighbor's home. The full immediate-response checklist is in what to do when you smell gas.
How to turn off the gas meter valve
The main gas shutoff valve sits on the inlet pipe at your gas meter, usually outside the house. To close it:
- Find the rectangular nub on the pipe — when its long edge runs parallel to the pipe, the gas is on.
- With a 12- to 15-inch adjustable wrench (or a dedicated gas/meter wrench), turn the nub a quarter turn in either direction until it sits crosswise (perpendicular) to the pipe. That's the closed position.
Keep that wrench within reach of the meter — taped nearby or in a labeled spot — so no one has to hunt for a tool during a leak.
⚠️ Never turn the gas back on yourself. This is the one rule with no exceptions. Once the gas is off, only your gas utility or a qualified professional can safely purge the lines, relight pilots, and verify every appliance. Reopening it yourself risks an unlit burner quietly filling your home with gas.
Because meter configurations differ, it's worth a one-time call to your gas company to confirm your exact procedure — and ask them to show the whole household. (When you practice, don't actually close the valve.) Many gas appliances also have their own shutoff valve on the supply line behind them, which lets you isolate one appliance without killing the whole house.
Automatic and propane shutoffs
Two variations are worth knowing. In earthquake-prone areas, a seismic shutoff valve can be installed to close the gas automatically when it senses strong shaking — some jurisdictions require one on new or sold homes. It's a backup, not a replacement for knowing your manual valve, and it still must be reset by a professional. If your home runs on propane instead of natural gas, the main shutoff is a hand-wheel valve on top of the tank (turn clockwise to close) rather than a meter nub — but the same unbreakable rule applies: never restore propane service yourself after an emergency shutoff.
Shutting off the electricity
Electricity is the shutoff you use to make a dangerous area safer — before water reaches outlets, during an electrical fire, or whenever you need to work on wiring. The control center is your service panel, also called the breaker box or load center.
Find and read your panel
Your service panel is typically in the garage, basement, a utility closet, or on an exterior wall. Inside you'll see two columns of circuit breakers — each one feeding a single circuit — plus one oversized switch, usually at the top or bottom, labeled with an amp rating like 100, 150, or 200. That's the main breaker, and it cuts power to the entire house at once.
The correct shut-off sequence
Order matters for the panel's longevity and your safety:
- Switch off the individual branch breakers first — flip each one to OFF.
- Then flip the large main breaker to OFF. Power to the whole house is now cut.
To restore power, reverse it: turn the main breaker on first, then switch the branch circuits back on one at a time. This keeps the panel from absorbing the entire household's startup load in a single surge.
⚠️ Never touch the panel while standing in water or with wet hands. If water is already up to the outlets or near the panel, do not wade in to reach it — call your utility or the fire department to cut power at the source. Electricity and water together can be fatal.
A key reason to know this cold: electrical sparks can ignite leaking gas. If you ever have both a gas leak and live power, the safe move is to leave and let professionals handle it — not to start flipping switches that could spark.
Which to shut off first: a simple priority order
When something's going wrong and adrenaline is high, fall back on this hierarchy:
| Situation | First move |
|---|---|
| Gas smell, hissing, or fire | Get everyone out. Shut gas off only if safe on the way out. Call 911 + gas company from outside. |
| Burst pipe or active flooding | Shut off the water at the main valve. Then mop up and call a plumber. |
| Water rising toward outlets or the panel | Kill the electricity at the main breaker — but only if you can reach it without standing in water. |
| You're unsure or it's escalating | Evacuate and call the utility or fire department. No valve is worth your safety. |
The throughline: people first, gas and fire next, then water and electricity. Property is replaceable.
Shutting off utilities before trouble: trips and storms
Not every shutoff happens in a crisis. Two of the smartest times to close a valve are entirely planned — and they prevent the emergency in the first place.
- Before a trip. For anything longer than a weekend, shut off the main water valve before you leave. A failed washer hose or supply line can flood an empty house for days. Drain a couple of faucets after closing the main, and in winter keep the heat no lower than 55°F so pipes don't freeze. Our pre-vacation home checklist and vacation maintenance guide walk through the full routine.
- Before a forecast storm or flood. If flooding is expected and authorities advise it, shut off electricity at the main breaker before water reaches the panel — never after. For evacuation orders, your utility may direct you to shut off gas as well. Build this into your hurricane preparation checklist.
- Before winter, for vacant or seasonal homes. If a property sits empty through freezing months, shutting off and draining the water system removes the freeze-and-burst risk entirely. See how to prepare your home for winter.
| When | Shut off | Why |
|---|---|---|
| Trip over a weekend long | Water (main valve) | Stops an unattended leak from flooding the house for days |
| Forecast flood, before water rises | Electricity (main breaker) | Prevents shock and electrical fire — only while the panel is still dry |
| Evacuation with utility guidance | Gas (+ water, power) | Removes fuel for fire and damage while no one is home |
| Vacant home through hard freeze | Water (off + drained) | Eliminates frozen-pipe burst risk entirely |
Special cases: apartments, condos, and shared buildings
If you rent or live in a condo, you usually control only what's inside your unit — not the building's mains. Your job is to know:
- Your unit's electrical panel — often in a closet, hallway, or laundry area.
- Fixture shutoffs under each sink and behind toilets, the water heater, and the washer.
- The building's emergency contact — for a major water or gas problem, you call maintenance, who control the building mains.
Locate these the week you move in, the same way a homeowner walks their three shutoffs. For more on where responsibility sits, see our condo maintenance guide.
Cost and gear: be ready for under $25
You don't need much to be prepared — and the small upfront cost is trivial against the thousands a single unprepared emergency can cost.
| Task | How often | DIY cost | Pro cost | Prevents |
|---|---|---|---|---|
| Gas/meter wrench (kept at the meter) | One-time | $8–20 | — | Wasted minutes hunting for a tool during a gas leak |
| Water meter key (for an outdoor curb box) | One-time | $10–20 | — | Being unable to reach an exterior shutoff |
| Shutoff labels / valve tags | One-time | $5–10 | — | Anyone in the home freezing because they can't find the valve |
| Replace a seized main water valve | As needed | — | $150–350 | A stuck valve that won't close during a flood |
| Add a lever-style main shutoff (upgrade) | One-time | — | $200–400 | A slow, stiff gate valve in a fast-moving emergency |
Label, store, and teach — the part most people skip
Knowing where the shutoffs are doesn't help if you're the only one who knows. Finish the job:
Do this now
- Tag each shutoff with a bright, weatherproof label so it's findable in the dark.
- Store the gas wrench and meter key at or beside the relevant valve.
- Walk the whole household through all three — adults and capable teens.
- Test the main water valve turns fully (and replace it if it's seized).
- Add it to your home binder with photos and locations.
Never do this
- Never turn the gas back on yourself — utility or pro only.
- Never touch the panel while standing in water or with wet hands.
- Never operate switches or flames when you smell gas.
- Never rely on the curb street valve as your main — it's hard to turn and needs a special tool.
- Never wait until the emergency to find out a valve is rusted shut.
Make it a one-time task and then forget about it — that's exactly what owner.tools does: it puts "locate and test your shutoffs" at the top of your plan so it's done once, properly, and recorded for the whole household.
This pairs naturally with a few other readiness habits: keep your smoke and CO alarms tested, know the broader home-emergency playbook, prevent water damage before it starts, and protect pipes from freezing. If you've just moved in, locating these shutoffs belongs on your first 30 days checklist.
Sources and further reading
- Ready.gov (U.S. Department of Homeland Security / FEMA), Safety Skills — Know How to Shut Off Utilities — guidance on water, gas, and electricity shutoff procedures, the rule that only a professional may restore gas, and shutting individual circuits before the main.
- U.S. Fire Administration — fire extinguisher and home-fire safety guidance referenced for emergency response.
- Your local gas and electric utility — the authoritative source for your specific meter and panel configuration; call them for a one-time walkthrough.