Call 811 before. Ya dig? Call 811 at least two days before you dig to have those underground utility-owned lines marked. It's free, and it's the law. April is National Safe Digging Month Gus ATMOS 811 energy. atmosenergy.com/GasSafety Call 811 before . Ya dig ? Call 811 at least two days before you dig to have those underground utility - owned lines marked . It's free , and it's the law . April is National Safe Digging Month Gus ATMOS 811 energy . atmosenergy.com/GasSafety