UGI Energy to do more® SMELL. EVACUATE. CALL. Rotten Egg Smell? It could be a gas leak. The odor of Mercaptan, a chemical that's added to natural gas to make it detectable, could be the first sign of a gas leak. Remember these tips to stay safe. LEAVE the area immediately and evacuate others. Move at least the length of a football field away. LEAVE the door open behind you. CALL UGI's 24/7 emergency line at 1.800.276.2722 or 911 from a safe distance where you can no longer smell gas. CALL 911 immediately from a safe distance if you hear or see natural gas blowing. DO NOT use electronics such as phones, computers, appliances, or lamps. DO NOT use fire such as a lighter, match, or pilot light. DO NOT use vehicles or powered equipment. DO NOT use email or social media to contact UGI-CALL instead. DO NOT reenter the building until a UGI technician has inspected it. Smell. Evacuate. Call. 800-276-2722 Visit www.UGI.com to learn more. UGI Energy to do more® SMELL . EVACUATE . CALL . Rotten Egg Smell ? It could be a gas leak . The odor of Mercaptan , a chemical that's added to natural gas to make it detectable , could be the first sign of a gas leak . Remember these tips to stay safe . LEAVE the area immediately and evacuate others . Move at least the length of a football field away . LEAVE the door open behind you . CALL UGI's 24/7 emergency line at 1.800.276.2722 or 911 from a safe distance where you can no longer smell gas . CALL 911 immediately from a safe distance if you hear or see natural gas blowing . DO NOT use electronics such as phones , computers , appliances , or lamps . DO NOT use fire such as a lighter , match , or pilot light . DO NOT use vehicles or powered equipment . DO NOT use email or social media to contact UGI - CALL instead . DO NOT reenter the building until a UGI technician has inspected it . Smell . Evacuate . Call . 800-276-2722 Visit www.UGI.com to learn more .