Smell gas near your stove? Exactly what to do first
Cooking
Photo: betül nur akyürek / Pexels Natural gas and propane are odorless, so utilities add mercaptan, the sulfur compound responsible for that rotten-egg smell. That smell is a safety feature working as designed, but it does not tell you how much gas is present. This guide walks through what to do immediately, and how to tell a harmless brief whiff from a leak that needs the gas company right now.
If the smell is strong, leave first and call from outside
A strong or persistent gas odor is not something to investigate. Do not flip light switches, unplug anything, use a phone indoors, or light a match, because any of those can produce a spark. Get everyone out, leave the door open behind you, and call 911 or your gas utility emergency line from a neighbor house or the street. Nicor and Peoples Gas both run 24-hour emergency numbers.
A brief whiff at ignition is usually normal
When a surface burner clicks a few times before lighting, a small amount of unburned gas escapes and you smell it for a second or two. That is normal, especially on a burner cap that is slightly misaligned or damp after cleaning. The distinction is duration: normal gas odor disappears within seconds of the flame catching and does not return.
Odor with the stove completely off is never normal
If you smell gas when nothing is running, that points to a leak at a connection, the shutoff valve, the flexible connector behind the range, or a burner valve that is not fully seating. This is not a wait-and-see situation. Shut off the gas at the valve behind or near the appliance if you can reach it safely, ventilate, and call for service.
Finding a small leak with soapy water
For a faint intermittent odor at a visible fitting, a technician will brush on a soap solution and watch for growing bubbles. Homeowners can do this on accessible external fittings, but never with a lighter or flame, and never inside the appliance body. Anything past the shutoff valve, including the manifold, burner valves, and safety valve, belongs to a licensed technician.
What a homeowner should never attempt
Do not disconnect or reconnect gas lines, replace a flexible connector, adjust a gas pressure regulator, or open the gas valve assembly. Improperly sealed threads and reused connectors are the two most common causes of post-repair leaks. Gas work in Illinois requires the right materials, joint compound rated for gas, and a proper leak test afterward.
Carbon monoxide is a different warning sign
Gas odor means unburned gas. Carbon monoxide is odorless and comes from incomplete combustion, so a burner flame that is yellow or orange rather than crisp blue, soot on pans, or headaches and drowsiness while cooking are the signals. Every home with gas appliances needs working CO detectors, and a yellow burner flame deserves a service call.
After the leak is fixed
A technician should pressure-test or leak-test every joint they touched before leaving, and confirm burner flames are blue and stable across all settings. If the range was moved, the flexible connector should be inspected for kinks and never reused if it has been sharply bent. Ask for confirmation that the test was performed.
Frequently asked questions
Is it safe to use my stove if I smelled gas once and it went away?
A single brief whiff during ignition is usually fine. Any odor lasting more than a few seconds or occurring with the stove off means stop using it and call for service.
Can a gas leak be too small to smell?
Yes. Very small leaks can fall below the odor threshold, which is one reason annual inspection of gas appliances is worthwhile.
Who pays for the gas company visit?
Utilities typically respond to emergency leak calls at no charge and will shut off service if needed, but repairs to the appliance itself are your responsibility.