In the wake of the September 9th San Bruno natural gas explosion, Senators Dianne Feinstein and Barbara Boxer introduced legislation to "strengthen oversight of the nation’s pipelines and increase the penalties for violations of federal pipeline safety regulations."

“The pipeline explosion in San Bruno was a tragedy that must never occur again in any American neighborhood,” Senator Feinstein said. “That’s why today we are introducing legislation specifically designed to improve pipeline safety - and to establish penalties for violators."

Senator Boxer said, “The tragic explosion in San Bruno makes clear why we must increase inspections of our nation’s pipelines. This measure will put more inspectors to work protecting our communities while setting tougher penalties for safety violations.”

Maps of PG&E gaslines can be found at the PG&E site (PDF), SF Appeal, or SFBG.

Further, if you're worried, you can call the PG&E Gas Transmission Pipeline Location Information hotline at 1-888-743-7431. According to the operator, you can ask them about any street and they will tell you how far your location is from a line.