If you smell gas (a rotten egg odor), follow these steps IMMEDIATELY:
In This Article
1. What NOT to Do If You Smell Gas2. Common Causes of Gas Smells3. How to Prevent Gas Leaks4. When to Call a Professional5. Minor Smell vs. Emergency Leak6. FAQNatural gas is odorless, so utility companies add a chemical (mercaptan) that smells like rotten eggs or sulfur. This distinctive odor is your warning system. Never ignore a gas smell.
What NOT to Do If You Smell Gas
DO NOT turn on/off any lights or electrical devices
Even a light switch can create a spark that ignites gas.
DO NOT use your phone inside the building
Cell phones can create a spark. Call from outside.
DO NOT light matches, candles, or use lighters
Open flames will ignite natural gas.
DO NOT try to locate the source yourself
Leave this to professionals. Evacuate immediately.
DO NOT re-enter the building until cleared by authorities
Wait for fire department or gas company clearance.
Common Causes of Gas Smells from Stoves
Not all gas smells are emergencies, but they all require immediate attention. If your stove or oven needs repair:
Pilot Light Extinguished
Older gas stoves with pilot lights can go out, releasing small amounts of gas. If you smell gas briefly after the pilot goes out, this may be the cause. However, if the smell persists, evacuate.
Loose Gas Line Connection
The flexible gas line connecting your range to the wall valve can loosen over time, especially if the stove is moved frequently for cleaning.
Faulty Gas Valve or Regulator
The control valves on your stove can wear out, allowing gas to leak even when burners are off.
Burner Not Igniting Properly
If you turn on a burner and it takes several seconds to ignite, you’re releasing unburned gas. This is not normal and requires repair.
Damaged Flex Line (from moving the stove)
Repeatedly pulling the stove away from the wall to clean behind it can kink or damage the gas flex line.
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How to Prevent Gas Leaks
When to Call a Professional (After the Emergency is Resolved)
After authorities clear your home as safe, you'll need a licensed appliance technician or gas technician to:
Minor smell (brief, faint):
If you smell gas for 1-2 seconds after turning on a burner (before ignition), this is relatively normal for older stoves. Open a window and schedule a service call soon.
Emergency leak (strong, persistent):
If the smell is strong, lasts more than a few seconds, or occurs when all burners are off—evacuate immediately and call 911.
Gas Smell Safety — Common Questions
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Written by
Andrei — Licensed Appliance Technician
Certified CA Technician · License #51001 · Licensed for gas appliance repair in California