The Aliso Canyon gas leak has cost Southern California Gas Co. and its parent company nearly $1 billion, and those costs could rise, officials said this week.

Sempra Energy said in an earnings report this week that the leak, which was discovered in October 2015, cost the company $913 million.

The leak at the facililty was massive, forcing more than 100,000 metric tons of methane into the air above the San Fernando Valley. It forced thousands from their homes in the northern San Fernando Valley before it was capped four months later. But that wasn’t before many complained of health problems such as bloody noses and headaches, and gave rise to a movement to shut down the facility — which supplies the natural gas power for customers across Southern California. The Aliso Canyon facility, according to the Sempra report, stores 63 percent of SoCal Gas’ natural gas.

“The costs incurred to remediate and stop the leak and to mitigate local community impacts have been significant and may increase, and we may be subject to potentially significant damages, restitution, and civil, administrative and criminal fines, penalties and other costs,” the utility’s report said.

SoCal Gas declined to comment for the story.

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So far, the gas company has recovered $469 million from its insurance policies. SoCal Gas estimated it may recover up to $887 million, a number that may rise “significantly,” according to the report.

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The $913 million number doesn’t include fees associated with damages from lawsuits, civil, administrative and criminal fines, penalties and other costs, “as it is not possible at this time to predict the outcome of these actions,” according to the utility’s report.

That number may rise as 373 lawsuits, including 45,000 plaintiffs as of Feb. 22, 2018, are pending in Los Angeles Superior Court against SoCal Gas.

The company seems ready to pay additional fees.

During the call, Debra Reed, chief executive of Sempra Energy, said the amount of $20 million was prepared for potential legal settlements.

“We’ve been focused on resolving remaining Aliso-related issues as expeditiously and safely as possible, including resolving legal claims,” she said.