The Sandalwood Fire was sparked Oct. 10 around 2 p.m. when the driver dumped burning trash in the area of Calimesa Boulevard and Sandalwood Drive.
The fire quickly spread to nearby vegetation and then ravaged the Villa Calimesa Mobile Home Park, destroying dozens of structures and rendering the park uninhabitable.
Two women, ages 61 and 89, died in the fire.
The flames scorched 1,011 acres before firefighters reached full containment on Oct. 14.
Lawyers for homeowners say a civil suit was filed in Riverside on Tuesday alleging CR&R Inc. placed business interests ahead of public safety.
The suit says a passer-by pleaded with the driver not to unload the trash amid high winds.
Waste industry experts have said drivers are trained to find a safe place to unload burning trash in a truck fire.
The fire destroyed 76 structures, mainly homes at the hilltop mobile home park, fire officials said. An additional 16 structures were damaged, nine moderately and five minimally.
Investigators are working to determine if any criminal charges will be filed in connection with the fire.
Eyewitness News has reached out to CR&R for comment.
The Associated Press contributed to this report.
VIDEO: Man loses home in Sandalwood Fire on eve of his birthday
Man loses home in Sandalwood Fire on eve of his birthday
Wall of fire flares up on roadside during Sandalwood Fire
Wall of fire flares up by side of road in Calimesa during Sandalwood Fire
Fire officials provide details on cause of massive brush fire
500-acre fire in Calimesa sparked after trash trunk dumped burning load, officials say