On October 23, 2015, SoCalGas detected a leak at one of the wells at its Aliso Canyon natural gas storage facility, located in the northern part of the San Fernando Valley in Los Angeles County. SoCalGas took immediate action to secure the area and implement safety precautions. Officials alerted on October 23 included the Los Angeles Fire Department, the Los Angeles County Fire Department, the Los Angeles County Fire Department’s Health Hazardous Materials Division, the Los Angeles County Department of Public Health [and other state & local agencies and schools]... Background and Media Resource materials can be found here:
https://www.socalgas.com/documents/news-room/background-resource-materials-media-briefing.pdf