MIDDLETOWN (CBS SF) – Nearly one year after the Valley Fire tore through Lake County, investigators said the massive blaze was sparked by faulty electrical wiring in a home.
The fire, which broke out on September 12, 2015, became the third most destructive fire in California history.READ MORE: San Francisco Police Scheduled Town Hall Meeting Over Fatal SFO Shooting
According to a statement from Cal Fire (.pdf), a residential electrical connection arced, igniting dry grass nearby.READ MORE: 49ers All-Pro LT Trent Williams Questionable For NFC Championship
Four people were killed, four firefighters were seriously injured and 1,955 structures were destroyed in the Valley Fire. A total of 76,067 acres were burned (118 square miles,) an area more than two and a half times the size of San Francisco.MORE NEWS: Castro Valley Man Faces Federal Charges In Alleged $1 Million COVID Unemployment Fraud Scheme
According to The Associated Press, the Valley Fire caused at least $700 million in insured damages. Cal Fire said the cost of extinguishing the blaze was $57 million.