"I will tell you, this goes well beyond Porter Ranch. We've had complaints from as far as Chatsworth, Northridge, and Granada Hills," emphasized Los Angeles City Councilman Mitchell Englander during a Porter Ranch town hall meeting on December 28. "Apparently this plume of toxic chemicals and whatever it might be, doesn't know zip codes […] This is the equivalent of the BP oil spill on land, in a populated community."

Aliso Canyon sits less than two and a half miles from Porter Ranch and less than 30 miles from the city of Los Angeles — the second most populous city in the United States — whose outlying total statistical area includes nearly 18 million residents, as of 2013.

Brown has been widely criticized for lack of decisive action on the leak, which is erupting from its underground storage area with all the force "of a volcano." Under Wednesday's declaration, "all state agencies will utilize state personnel, equipment, and facilities to ensure a continuous and thorough state response to this incident."

Porter Ranch residents have been evacuating the area for some time, though SoCalGas' rather maladroit handling of the relocation procedure has been a nightmare — and the cause for a mounting number of lawsuits, including one from the L.A. city attorney's office.