The power, transportation and sewer systems have been "significantly damaged" in the fires, Los Angeles County Public Works Director Mark Pestrella said during the briefing, as they focus on utility restoration.

There is also a "tremendous amount of debris" that needs to be cleared, he said, warning that some debris may be hazardous and toxic.

He said the reservoirs are full and "continue to be ready and at the disposal of our firefighting friends," though the municipal water system "continues to suffer poor water quality" due to the ash and debris.

"I would just say, with all caution, anyone who's remained behind, if there is any residence in your area that is burned to the ground and you are still there, you should just go ahead and boil water," he said.

Nearly 180,000 residents in Los Angeles are under evacuation orders, with nearly 200,000 others under evacuation warnings, authorities said Thursday.

"I cannot emphasize enough that I urge residents that are asked to evacuate to follow our warnings," Los Angeles County Sheriff Robert Luna said during the press briefing.

Luna warned that not following an evacuation warning is a misdemeanor.

Los Angeles is in "much better posture" to battle the wildfires on Thursday, Los Angeles Fire Chief Kristin Crowley said during the briefing.

"The number of resources assigned to this fire siege event has increased significantly," she said. "Out-of-state resources continue to arrive in Los Angeles county and city, and we are appreciative to our fire partners from throughout the western United States for providing assistance to Los Angeles County in our time of need."

Crowley said growth of the Eaton Fire has been "significantly stopped," with the fire remaining at 10,600 acres burned.

The Lidia Fire in Acton has been 40% contained and "forward progress has been stopped," she said.

Los Angeles Mayor Karen Bass made public remarks on the devastating wildfires during a press briefing on Thursday as she faces criticism over how they have been handled.

"Los Angeles will stand united and stand strong," said Bass, who returned to the city after traveling to Ghana earlier this week to attend the presidential inauguration of John Dramani.

Bass had received criticism from some who said she should not have gone to the inauguration while red flag warnings were in effect.

"My thoughts are with the thousands of Angelenos who are impacted by this emergency, as more Angelenos were forced to make the terrifying decision to evacuate," she said. "Our priorities, of course, are to keep Angelenos safe and to protect homes."

Bass commended residents for following evacuation orders while noting Angelenos should "continue to proceed with caution," as the weather conditions have "created a perfect storm that has driven people from their homes and have taken people's homes, and that has taken people's lives."

"We have pre-deployed. We are executing a strategy, and we are adapting to conditions on the ground in real-time. This is absolutely an unprecedented, historic firestorm, but we are all hands on deck," she said.