Call 811 Before You Dig A simple call to 811 ensures that underground utility lines are marked for free - because natural gas lines can be buried anywhere. Whether you're a homeowner or a professional excavator, every digging project requires a call - no matter how small. BEFORE DIGGING: Call 811 at least two working days before starting any digging project Wait for the site to be marked Respect the marks Dig with Care: Use only hand tools when digging within 24 inches of marks FAILING TO CALL CAN BE DANGEROUS AND COSTLY Not calling could lead to personal injury, disrupt natural gas service to entire neighborhoods, and might make you responsible for injuries, repair costs, and criminal penalties. If you ever suspect a natural gas leak, leave the area immediately and call 911 and Southwest Gas at 877-860-6020, whether you're our customer or not. 811. Know what's below. Call before you dig. SOUTHWEST GAS For more information about natural gas safety, visit swgas.com/safety or call 877-860-6020. Call 811 Before You Dig A simple call to 811 ensures that underground utility lines are marked for free - because natural gas lines can be buried anywhere . Whether you're a homeowner or a professional excavator , every digging project requires a call - no matter how small . BEFORE DIGGING : Call 811 at least two working days before starting any digging project Wait for the site to be marked Respect the marks Dig with Care : Use only hand tools when digging within 24 inches of marks FAILING TO CALL CAN BE DANGEROUS AND COSTLY Not calling could lead to personal injury , disrupt natural gas service to entire neighborhoods , and might make you responsible for injuries , repair costs , and criminal penalties . If you ever suspect a natural gas leak , leave the area immediately and call 911 and Southwest Gas at 877-860-6020 , whether you're our customer or not . 811 . Know what's below . Call before you dig . SOUTHWEST GAS For more information about natural gas safety , visit swgas.com/safety or call 877-860-6020 .