Evacuation orders remained in place for about 50,000 people in Garden Grove, California, located south of Los Angeles.
"In no way, shape or form, will Norfolk Southern get off the hook for the mess that they created," EPA Administrator Michael Regan said
Health officials recommend people avoid swimming or fishing in the affected section of Little Creek until further notice.
At least 2,000 gallons of kerosene leaked, according to what was reported to the National Response Center, Clayton spokesperson said.
A small fire on a Rose Parade float that caused a delay in the parade on New Year's Day may have been started by transmission fluid, according to officials.
Capital Boulevard was shut down Wednesday night for hours from Purnell Road to Stadium Drive because of a possible hazardous chemical leak from a tractor trailer.
