Think of your gas line in two sections. San Diego Gas and Electric is responsible for the pipelines that carry natural gas to your meter. At the same time, you are responsible for maintaining and repairing the lines that take it from the meter to your home.
If the gas company is called to deal with a problem that has resulted from damage to your side of the line, they will turn off service to your house. It will likely remain turned off until you repair the issue. Additionally, they may require you to provide the results of a city inspection and attain a city permit (all on your dime) before restoring gas service to your home.