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Leave the building or area immediately. Take other people and pets with you if you can do so without delaying. Do not operate the appliance, look for the leak, use switches or phones nearby, or attempt a repair. Once you are well away from the odor, call 911 and your local gas utility. Follow their instructions and do not return until emergency responders or utility personnel say it is safe.
What to do first when you smell gas
Treat any unexplained gas odor near a stove, water heater, furnace, dryer or other appliance as a possible leak. Odorized natural gas is commonly described as smelling like rotten eggs or sulfur. You might also hear hissing, whistling or roaring. Outdoor clues can include bubbling water, blowing dirt or vegetation that is dying in an otherwise healthy area. You do not need to confirm a particular smell or sound before acting.
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- Leave without investigating. Move everyone and pets outside or to another safe location. Do not stop to collect belongings, find the source, check burners or search cabinets.
- Avoid anything that could make a spark. Do not turn lights or appliances on or off, plug or unplug equipment, use a flashlight, smoke, light a match, ring a doorbell, open or close a garage door, or start a vehicle near the suspected leak.
- Call from well away. From outside and at a safe distance, call 911 and the local gas utility. If you cannot safely use your own phone, use a neighbor’s phone or another phone away from the odor.
- Stay out. Wait for emergency responders or utility personnel to investigate and tell you when it is safe to return.
The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) summarizes the emergency approach as leaving the area and calling 911 from a neighbor’s home or another place well away from the leak. Its pipeline-leak guidance is available at phmsa.dot.gov/safety-awareness/pipeline/pipeline-leak-recognition-and-what-do.
Why an appliance odor requires immediate action
Natural gas can collect indoors and ignite if it reaches a flame, electrical arc or other ignition source. A smell concentrated around one appliance does not prove that the appliance itself is the only problem; gas may be escaping from a connector, shutoff, nearby piping or another part of the building system. Trying to identify the exact point can keep you in a hazardous atmosphere and can create the spark that ignites it.
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Some people cannot smell odorized gas reliably because of a reduced sense of smell, illness, age or simple habituation. That is why a faint odor, an unusual sound or a report from another person should be treated seriously rather than dismissed.
Ignition sources to avoid
| Do not do this near the suspected leak | Why it matters |
|---|---|
| Turn lights, thermostats or appliance controls on or off | A switch or control can produce a small electrical arc. |
| Use a phone, flashlight or other electronic device in the affected area | Electrical equipment can provide an ignition source. |
| Smoke, light a candle or use a match, lighter or flame | An open flame can ignite accumulated gas. |
| Ring a doorbell, operate a garage-door opener or start a vehicle nearby | These devices can spark while operating. |
| Plug in, unplug or move electrical equipment | Connecting or disconnecting equipment can arc. |
Do not assume that a quick action is harmless because the odor seems weak. Leave first; report the situation from a safe location.
Should you turn off the appliance or gas valve?
No. Do not go back to shut off a burner, press an appliance button, close a valve or tighten a fitting once you smell gas. Guidance is not uniform on whether an appliance should be turned off in a suspected leak. PHMSA has a page that mentions making sure appliances are fully off, while fire and utility guidance for an odor already present says not to operate appliances or switches. For this situation, the safer instruction is to leave without touching controls and let trained responders or the gas utility handle the gas system.
Do not attempt to locate the leak with soapy water, remove panels, relight a pilot, disconnect a flexible connector or make any temporary repair. Pipeline safety guidance also warns the public not to operate pipeline valves. A utility technician or fire department can isolate the supply using the correct procedure and equipment.
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Can you use your phone if you smell gas?
Do not use a phone in the room, near the appliance or anywhere the odor is present. Walk outside or to another location well away from the suspected leak before calling. The same rule applies to flashlights, smart-home controls, doorbells and other powered devices. If you are already outside and the odor is also present outdoors, continue moving away until emergency personnel or the utility can advise you where to wait.
Who to call and what to tell them
Call 911 and the local gas utility after you have reached safety. Emergency numbers and utility responsibilities vary by country and region, so use your local emergency procedure if it differs. In the United States, 911 can dispatch fire and emergency services, while the utility can investigate and control its gas facilities.
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- The exact address and the safest way to reach the property.
- Where the odor was noticed, such as beside a range, furnace or water heater.
- Whether anyone is still inside, trapped, injured or having breathing problems.
- Any sound, outdoor sign or visible fire associated with the odor.
- Whether the smell is indoors, outdoors or both, and whether it is getting stronger.
Do not re-enter to collect information or read a meter. If responders ask you to move farther away, do so. Keep other people, pets and vehicles clear of the area so crews can work.
What if there is a gas fire?
Leave immediately and call 911 from a safe location. Do not try to extinguish a gas-fed fire, shut a valve or retrieve items. Extinguishing flames without stopping the gas flow can allow unburned gas to accumulate and create a larger explosion hazard. Tell 911 that a gas fire may be involved and follow the fire department’s directions.
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What if the smell disappears?
A fading odor does not prove that the system is safe. Gas flow can change, ventilation can disperse the odor, or your sense of smell can become less sensitive. Report the event anyway and remain out until responders or utility personnel investigate and release the area. Do not relight pilots or resume using the appliance based only on the smell going away.
When is it safe to go back inside?
Only emergency responders or qualified utility personnel on scene can make that decision. The Indiana Utility Regulatory Commission and other public-safety agencies advise staying out until officials or utility staff declare the area safe. A neighbor’s reassurance, a silent detector or a brief check through a window is not a clearance.
After the all-clear, ask the utility or responding fire department what equipment must be inspected before use. Do not restore service, relight an appliance or attempt a repair unless the responsible professionals specifically authorize it and explain who should perform the work.
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Apartment or condominium
Alert people as you leave only if you can do so without delaying or operating a doorbell. From outside, call 911, the gas utility and the building’s emergency contact. Do not use an elevator or electrical controls in the odor area if doing so would keep you inside; follow fire-department instructions about evacuation routes.
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Use the site’s emergency plan only to the extent it does not delay evacuation. Notify a supervisor from a safe location after calling emergency services when needed. Keep workers, visitors and vehicles away from the suspected area. Do not enter a mechanical room, excavate around a line or operate a facility shutoff unless trained responders direct you to do so.
Odor outdoors
Move away from the suspected line, appliance or excavation and keep ignition sources away. Call 911 and the utility from a safe distance. Do not drive over, dig near or approach bubbling water, blowing soil or damaged gas equipment.
Gas detectors: useful preparation, not an emergency response
The American Public Gas Association says a household natural-gas detector may help people who have a weak sense of smell. A detector can provide an additional warning, but it does not replace odor awareness, maintenance or emergency planning. If you smell gas, do not wait for an alarm, test the detector, change its batteries or move it closer to the appliance. Leave and call from safety.
For preparedness, follow the detector manufacturer’s placement, testing and replacement instructions, and make sure everyone in the household knows the exit route and the outdoor meeting point. Detector availability, sensing technology and alarm thresholds differ by product; no specific model or performance level is established here.
Common mistakes that increase risk
- Searching for the source: Walking from room to room extends your exposure and may take you toward a higher concentration.
- Shutting off a control “just this once”: Operating a switch, valve or appliance can create a spark; leave system controls to responders.
- Calling from inside: A phone call is safer after you are well away from the odor.
- Opening windows before leaving: Some local guidance mentions ventilation, but other fire guidance says not to delay evacuation. Do not make opening windows a task; exit promptly and follow local responder instructions.
- Returning because the odor is gone: Odor strength is not a safety test. Wait for an official all-clear.
- Trying a do-it-yourself repair: Do not tighten fittings, relight pilots or replace parts while a leak is suspected.
What to remember
The correct response is simple even when the source is uncertain: get people and pets out, avoid ignition sources, call 911 and the gas utility from well away, and remain outside until professionals declare the area safe. Local instructions may differ by country, utility and building, so follow the directions of the emergency responders who arrive.
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