The Aliso Canyon gas leak (also called Porter Ranch gas leak and Porter Ranch gas blowout) was a massive natural gas leak in the Santa Susana Mountains near Porter Ranch, Los Angeles, California. Discovered by SoCalGas employees on October 23, 2015, gas was escaping from a well within the Aliso Canyon underground storage facility. This second-largest gas storage facility of its kind in the United States belongs to the Southern California Gas Company, a subsidiary of Sempra Energy. On January 6, 2016, Governor Jerry Brown issued a state of emergency. The Aliso gas leak's carbon footprint is said to be larger than the "Deepwater Horizon" leak in the Gulf of Mexico. On February 11, 2016, the gas company reported that it had the leak under control. On February 18, 2016, state officials announced that the leak was permanently plugged.