Leaky Gas Line: What to Do Safely

A gas leak can cause fire, explosion, or poisoning. This guide explains how to respond safely and arrange a proper repair; it does not provide instructions for tightening, sealing, testing, or replacing gas piping. Do not try to locate the exact leak yourself. If you smell gas, hear a hiss, or suspect a leak, get everyone out and contact emergency services or the gas utility.

What You’ll Need

A safe place well away from the building where you can make calls.
A phone to call 911 or your gas utility once you are outside and away from the suspected leak.
Contact information for your gas utility, if readily available. Do not go back inside to look for it.
A licensed, qualified gas-line professional for repair after the immediate hazard has been assessed.

Do not bring tools, a flashlight, a phone, or other belongings with you if retrieving them would delay your exit or require entering the suspected leak area. Do not use a vehicle in an enclosed garage near a possible leak.

Step-by-Step

Recognize the warning. Natural gas is commonly odorized to give it a sulfur-like or rotten-egg smell. A hissing sound near a gas appliance or pipe can also signal a problem. Do not wait for several signs or try to confirm the source. If you suspect a leak, treat it as real.
Get everyone out. Tell other people to leave immediately. Do not stop to collect possessions, open windows, or investigate. Avoid using elevators if leaving a multi-story building; take the stairs if safe. Move well away from the building and any area where gas may be accumulating.
Avoid ignition sources. Do not smoke, light matches, use lighters, or operate appliances. Do not turn lights or switches on or off, plug in or unplug devices, use a garage-door opener, or start a vehicle close to the suspected leak. Electrical sparks can ignite gas.
Call for help from a safe place. Once outside and away from the suspected leak, call 911 if the odor is strong, you hear gas escaping, anyone feels unwell, or there is immediate danger. Also contact your gas utility’s emergency line. Follow the dispatcher’s and utility’s instructions; do not re-enter to make the calls.
Keep others away. Warn people not to enter the building or approach the suspected leak. Do not attempt to shut off the gas at a meter or appliance unless emergency responders or the utility specifically direct you and you can do so without entering the hazard area. Do not take risks to reach a shutoff.
Wait for the all-clear. Stay outside until emergency responders or the gas utility say it is safe to return. They can assess the hazard, shut off the supply if needed, and advise what must happen before service can be restored.
Arrange a qualified repair. Once the immediate emergency is controlled, have a licensed professional qualified for gas piping inspect and repair the line. Ask the utility or local building department what credentials, permits, inspections, and pressure or leak tests apply in your area. Do not restore gas service or relight appliances unless the utility or qualified professional says it is safe.
Keep records and follow up. Get the repair details and any inspection or test documentation. Follow instructions for appliance relighting, ventilation, and service restoration. If you smell gas again, hear hissing, or have any doubt about safety, leave and call the utility or 911 again.

Common Mistakes

Trying to find the leak. Do not use a flame, soapy water, a leak detector, or a handheld electronic device to investigate a suspected active leak. Leave detection and assessment to responders and qualified professionals.
Applying tape, sealant, or a clamp. Household products are not a safe repair for gas piping. A patch can fail, conceal ongoing leakage, or complicate proper repair.
Operating the shutoff without a safe plan. Do not approach a meter, valve, or appliance in a gas-filled area. Only follow instructions from emergency responders or the utility if reaching the control is safe.
Assuming the smell has gone away. Odor may fade or be hard to detect, but that does not prove the leak is fixed or the area is safe. Wait for an official all-clear.
Restarting service yourself. Turning gas back on or relighting equipment without authorization can create another hazard. Have service restored and appliances checked as directed by the utility or a qualified professional.
Hiring someone without gas-line qualifications. General handyman experience does not necessarily qualify someone to work on gas piping. Verify applicable licensing and inspection requirements with the local authority.

Tips

Save the gas utility’s emergency number in your phone before an emergency, but call only after moving to a safe location.
Teach household members the basic response: leave, avoid switches and flames, and call for help from outside.
If the suspected leak is in a shared building, alert others from a safe distance and notify building management after calling emergency services or the utility. Do not enter other units to investigate.
Use only the utility’s or emergency responders’ guidance about whether the area is safe. A quiet room or lack of odor is not an all-clear.
After any repair, keep the paperwork and ask who is responsible for the required inspection, testing, and safe return to service.

Troubleshooting

You smell gas but cannot tell where it is coming from: Do not search room to room. Leave the building, move away, and call 911 or the utility. The source can be outside, in a neighboring space, or near an appliance.

The odor is faint or intermittent: Treat it as a possible leak. Odor strength is not a reliable safety test. Leave and report it rather than waiting to see whether it returns.

You are outside but the smell remains: Move farther away, preferably upwind if you can do so without approaching the suspected source. Tell the dispatcher where you are and follow instructions.

You cannot reach the gas utility: Call 911 if there is a suspected active leak or immediate danger. Do not go back inside or delay evacuation while searching for another number.

The gas has been shut off but the repair is not complete: Keep away from the line and do not turn the supply back on. Contact the utility and a qualified gas professional to coordinate inspection and safe restoration.

The smell returns after a repair: Leave immediately and report a new suspected leak. Do not assume the earlier repair means the area is safe; responders or the utility need to reassess it.

Frequently Asked Questions

Can I fix a leaky gas line myself?

No. Do not tighten fittings, apply sealant, or replace gas piping yourself. Evacuate and have the line assessed and repaired by a qualified, licensed professional after the immediate hazard is addressed.

Should I turn off the gas at the meter?

Do not approach or operate a meter or shutoff in a suspected leak area. Leave that to the utility or emergency responders, unless they give you specific instructions and confirm you can act safely.

Is a rotten-egg smell always a gas leak?

It can have other causes, but a sulfur-like odor may indicate odorized natural gas. Treat an unexplained smell as a possible leak and report it from a safe location.

Can I use a fan or open windows to clear the gas?

No. Do not operate fans, switches, or appliances, and do not delay leaving to open windows. Get outside and let emergency responders or the utility manage the hazard.

When can I go back inside?

Only after emergency responders or the gas utility explicitly say the building is safe to enter. Do not rely on the smell disappearing or on a repair appearing complete.

Who is allowed to repair a gas line?

Use a professional qualified and licensed for gas piping under local requirements. The utility or local building department can explain which permits and inspections apply.

Further reading: U.S. Department of Energy. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.