California fires live updates: 5,000 structures destroyed in historic Palisades Fire

Residents in Los Angeles were urged to conserve water, as firefighters battle multiple wildfires.

"We had a tremendous demand on our system and the Palisades," Janisse Quiñones, the head of the Los Angeles Department of Water and Power, said during a press briefing Wednesday. "We pushed the system to the extreme."

She said they saw four times the normal demand for 15 hours straight, which lowered the water pressure. Two tanks ran out of water on Tuesday, and a third early Wednesday morning, as firefighters battled the Palisades Fire.

"We were not able to fill the tanks fast enough," Quiñones said.

She said they were sending approximately 20 water tanks to support the fire department.

"If there's a message to take away from me today it's I need our customers to really conserve water -- not just in the Palisades area, but the whole system. Because the fire department needs the water to fight the fires, and we're fighting a wildfire with urban water systems, and that is really challenging," Quiñones said.

After being briefed on the four wildfires ablaze in Southern California, President Joe Biden said he signed a major disaster declaration over the California fires on Wednesday.

"It's astounding what's happening here," Biden told reporters.

Biden said he has directed the Department of Defense to provide more firefighting needs and discussed the other resources that are being brought in to help.

He pledged that the federal government will continue to provide support for "as long as it takes."

"We’re prepared to do anything and everything, as long as it takes, to tame these fires and help … make sure they get back to normal," Biden said, adding, "It’s going to be a hell of a long way."

The Palisades Fire has spread to 11,802 acres with 0% containment, according to Cal Fire.

"Jimmy Kimmel Live" as well as the dramas "Grey's Anatomy" and "Doctor Odyssey" have suspended production amid the fires, according to ABC.