Georgia's natural gas setup splits the job in two. Atlanta Gas Light delivers gas through its pipes and maintains the lines up to your meter, while you buy the gas itself from a certified marketer. Some cities, such as Grantville, run their own gas systems instead. Either way, the piping from the meter to your appliances is the homeowner's to maintain.
That customer-owned piping includes buried lines to a grill, fire pit, generator or detached garage. Atlanta Gas Light advises having buried gas piping checked periodically for corrosion and leaks. Georgia 811 only marks public utilities, so your private gas line will not be marked when you request a locate. Plan any digging with that in mind.