In its untouched state, natural gas is actually odorless. For safety reasons, Southwest Gas injects an element called mercaptan, which emits an odor similar to sulfur or rotten eggs. Here’s the simple rule…If you smell rotten eggs, leave the area, then call us for help, whether you have natural gas at your home or business or not.
What do you do if you suspect a leak?
Leave the area immediately
From a safe place, call 911 and Southwest Gas at 877-860-6020, day or night. A Southwest Gas representative will be there as soon as possible
Don’t smoke or use matches or lighters
Don’t turn on or off any electric switches, thermostats, or appliance controls, or do anything that could cause a spark
Don’t start or stop an engine or use automated (garage) doors
Suspect a Natural Gas Leak?
Whether you’re our customer or not.
How to Identify a Leak
Smell an odor similar to rotten eggs, even if its faint or momentary.
Hear a hissing or roaring coming from the ground, aboveground piping, or a natural gas appliance.
See dirt or water blowing into the air, unexplained dead or dying vegetation or grass, or standing water continuously bubbling.
Every digging job requires a call to 811 before you dig - even small projects like planting trees or shrubs. Whether you're a homeowner or professional excavator, one call to 811 before you dig gets underground utility-owned lines marked for FREE.
It's Free. It's Easy. It's the Law.
Digging without calling can result in a natural gas leak, which has the potential to disrupt service to an entire neighborhood, cause an evacuation, fire, property damage, injury, or loss of life, and potentially result in fines and repair costs. Calling 811 before every digging project gets your underground utility-owned lines marked for free and helps prevent undesired consequences. Be aware, however, that customer buried piping can't be located by calling 811.
Wait for the Site to be marked
Respect the Marks
Dig with Care
Natural Gas Fireplace
Taking precautions when using your natural gas fireplace can mean the difference between a relaxing situation and a hazardous one. When using decorative gas logs, ensure that the fireplace/chimney damper is in the open position.
When cooking, the flame shouldn’t extend beyond the bottom of the pot, and always keep the burners on your range clean to ensure maximum efficiency and safety.
Stay safe at home by keeping a minimum of three feet clear around your water heater and furnace. Prevent scalding accidents by setting your water heater thermostat at or below the manufacturer’s recommendation.
Installation & Repair
Keep yourself and your family safe with properly operating appliances. Make sure that licensed plumbers install and repair natural gas equipment and appliances, as well as perform annual inspections and maintenance on your gas appliances.
Natural gas appliances are very safe. However, like all appliances, if improperly maintained or malfunctioning, they can be dangerous. One of those dangers is exposure to carbon monoxide. Carbon monoxide is produced by the incomplete burning of fuel, including natural gas. It’s a poisonous, odorless, and colorless gas that can be fatal. Any suspected carbon monoxide exposure is an emergency.
Symptoms of Carbon Monoxide Exposure
Shortness of breath
Loss of muscular coordination
Loss of consciousness
Carbon Monoxide Detectors
The U.S. Consumer Product Safety Commission recommends that consumers install carbon monoxide detectors. They also advise that a carbon monoxide alarm can provide some added protection, but it’s no substitute for proper use and upkeep of appliances that can produce carbon monoxide. Additional information can be found on their website at
Consumer Products Safety Commission
Special note for California residents: Make sure your structure has functioning carbon monoxide detectors as required by California Health and Safety Code §17926. More about this law can be found in the California Carbon Monoxide Poisoning Prevention Act of 2010.
Please note: Southwest Gas does not inspect for the absence of carbon monoxide detectors, their placement, or install or service these detectors.
Leave the premises and get into fresh air immediately.
Call 911 or your local emergency number as soon as possible to get medical attention.
DON'T RE-ENTER THE BUILDING
Don’t re-enter the building until an emergency official has determined the building is safe and you’ve been given permission to do so.
Prevent Carbon Monoxide Emergencies
Southwest Gas recommends that you have your natural gas appliances serviced annually by a trained professional. In addition to keeping your appliances operating at optimal efficiency for energy conservation, this is one of the best ways to prevent carbon monoxide emergencies. For a list of qualified plumbers, contractors, or appliance dealers,
, search online, or call our Energy Specialists at 800-654-2765.
If someone just shows up at your door to perform services you haven’t requested, please don’t let them into your home. Instead, whether or not you’re a Southwest Gas customer, call us immediately at 877-860-6020, 24 hours a day, seven days a week to verify their identity. If they’re Southwest Gas employees, they’ll gladly wait outside while you make the call.
Company and Contract Personnel:
Wear an identification badge that includes their name, picture, and company logo
Generally come to a home only when service is requested
Identify themselves and the purpose of their visit
Enter your home only at your request
Additionally, most Southwest Gas employees drive marked company vehicles and wear a company uniform with our logo.
Natural gas utilities across the country have discovered locations where natural gas pipes were inadvertently installed through sewer pipes. This doesn’t create a safety hazard so long as the natural gas pipe is undamaged. However, damage to natural gas pipes can occur when equipment is used to unclog sewer pipes. This can lead to a natural gas leak that could result in a fire or explosion, possibly causing injury or death to those who unclog the sewer pipes and to those in structures attached to the sewer pipe.
SENSE A BUMP? CALL IT IN!
If you or your plumber sense or see that there might be an obstruction or blockage in the sewer line connecting a house or business to the main sewer line, call Southwest Gas at 877-860-6020 and press "9" for immediate assistance to ensure that a gas line is not affected or has not been damaged. There is no charge for this service.
In addition, if you’re planning sewer work, call Southwest Gas at 877-860-6020 and press "9" for a line location of underground gas lines prior to cleaning out a sewer line with a rooter device. The service is free.
Take immediate action if you encounter any of the following signs when you, or your plumber, clean out a sewer line with a rooter device:
A natural gas odor at the cleanout or inside the building served by the sewer line, even if it’s faint or momentary.
Bubbles rising through standing water or in the toilet bowl.
Leave the area immediately and from a safe place, call 911 and Southwest Gas at 877-860-6020 immediately, day or night. A Southwest Gas representative will be there as soon as possible.
If you’re a property owner or manager, tenant and/or occupant, you’re responsible for maintaining all gas lines on your side of the meter. This “customer buried piping” includes all gas lines running from the gas meter to the appliances or equipment on your property. In some cases, the meter may be located at your property line or a distance away from your home or business.
For Arizona residents, you may be qualified for our free leak inspection and Customer-Owned Yard Line (COYL) replacement. Learn more about our
A licensed, qualified plumber or contractor can assist you in finding, inspecting and repairing your customer buried piping.
to search a list of contractors in your area or call our Energy Specialists at 800-654-2765.
Monitor and properly maintain the natural gas lines you own
Periodically inspect your lines for leaks and/or corrosion
Repair the lines immediately if any unsafe condition is discovered
Hand dig when excavating near any buried gas piping
An excess flow valve (EFV) is a device that automatically reduces the flow of natural gas if a service line is broken. The EFV is installed on the service line that runs underground between the gas main and the meter on a customer’s property. Because the EFV restricts the flow of gas, it reduces the potential for fire-related property damage, personal injury, and death. Southwest Gas has installed EFVs on most residences built after June 2008.
While the valve provides enhanced safety, it’s not designed to operate in response to small leaks in the service line, nor protect against customer appliance malfunction, house line leaks, or small punctures in the underground pipe. An EFV may not protect against damage to pipelines from earthquakes or flooding. If you’d like a cost estimate to have an EFV installed at your residence, or if you’d like to find out if you already have an EFV, please call our Energy Specialists at 800-654-2765 to get more information.
An earthquake or seismic shut-off valve automatically shuts off your natural gas service when an earthquake of a sufficient magnitude occurs at your home’s location. These valves can be purchased and installed through independent suppliers and contractors.
If an earthquake or other significant event causes your seismic shut-off valve to close, contact a licensed, qualified contractor to reset the valve, verify that no gas leaks exist, and perform a safety check of your gas appliances before they’re placed back into operation. For a list of qualified plumbers call our Energy Specialists at 800-654-2765.
Corrugated stainless steel tubing (CSST)
Corrugated stainless steel tubing (CSST) is a flexible, thin-walled metallic tubing used to supply natural gas in some residential, commercial, and industrial buildings. CSST often has a yellow or black plastic coating and is typically found inside walls and through and along floor and ceiling joists. It’s not the same as the flexible appliance connectors that attach directly to your gas appliances.
PROTECT AGAINST LIGHTNING
To help protect structures from potential lightning strikes, the installer of CSST and/or the owner/operator of the structure where the CSST is used should consider installing an appropriate lightning protection system pursuant to NFPA 780 or other recognized standards.
Southwest Gas doesn’t provide inspection service for CSST installations. If you’re unsure whether CSST is installed in your structure, contact your builder, contractor, or a licensed plumber for an evaluation or for more information.
CSST CLASS ACTION LAWSUIT
In 2002, four manufacturers of CSST settled a class action lawsuit in which it was alleged by plaintiffs, but denied by defendants, that CSST posed an unreasonable risk of gas leaks and fire due to lightning strikes. For more information on the CSST Settlement Agreement, visit
Kids and Natural Gas Safety
This video explains which appliances use natural gas, how to identify a natural gas leak and what to do if a leak occurs.
Customer Safety Booklet
Learn more about how to keep your home and family safe.