Energy to do moree Rotten Egg Smell? It could be a gas leak. Mercaptan, a chemical that's added to natural gas to make it detectable could be the first sign of a gas leak Be a hero-keep your family safe with these tips. LEAVE immediately, taking everyone (including pets) with you. DO NOTuse electronics such as phones, computers, appliances, orlamps LEAVE the door open behind you. DO NOTuse fire such as a lighter, CALL UGI's 24/7 emergency line at 1.800.276.2722 or 911 from a safe distance where you can no longerDONOTuse vehicles or powered smell gas. match, or pilot light equipment if you smell gas. to contact UGI-CALL instead. CALL 911 immediately from a safe DO NOTuse email or social media distance if you hear or see natural gas blowing anywhere DO NOT reenter the building until a UGI technician has inspected it. Protect Your Family Call 800-276-2722 or visit www.UGI.com to learn more