(CNN) The 11,000 firefighters battling "one of the greatest tragedies" to ever strike California are starting to gain the upper hand.

But as more residents return home, many are discovering they have nothing to return home to.

Allison De Toffoli took one look at her parents' home and sobbed.

"They're 85 years old, and I just don't know if they can rebuild," she said.

Two women hug as they watch houses burn in Santa Rosa on October 9.

Two women hug as they watch houses burn in Santa Rosa on October 9.

The remains of fire-damaged homes are seen in Glen Ellen on October 9.

The remains of fire-damaged homes are seen in Glen Ellen on October 9.

Smoke rises in the hills east of Napa on October 9.

Smoke rises in the hills east of Napa on October 9.

A tent structure built for the Safeway Open golf tournament burns in Napa on October 9.

A tent structure built for the Safeway Open golf tournament burns in Napa on October 9.

The remains of fire-damaged homes and cars smolder at a Santa Rosa trailer park on October 9.

The remains of fire-damaged homes and cars smolder at a Santa Rosa trailer park on October 9.

Santa Rosa residents sift through the remains of a burned home on October 9.

Santa Rosa residents sift through the remains of a burned home on October 9.

A woman moves horses in Orange as strong Santa Ana winds blow smoke from the Canyon 2 fire toward them on October 9.

A woman moves horses in Orange as strong Santa Ana winds blow smoke from the Canyon 2 fire toward them on October 9.

Kristine Pond searches what's left of her family's home in Santa Rosa on October 9.

Kristine Pond searches what's left of her family's home in Santa Rosa on October 9.

A man rushes to save his house as a wildfire moves through Glen Ellen on October 9.

A man rushes to save his house as a wildfire moves through Glen Ellen on October 9.

Fire burns from an open gas valve near the pool area of a Santa Rosa trailer park on October 9.

Fire burns from an open gas valve near the pool area of a Santa Rosa trailer park on October 9.

Jim Stites watches as part of his neighborhood burns in Fountaingrove on October 9.

Jim Stites watches as part of his neighborhood burns in Fountaingrove on October 9.

The Santa Rosa Hilton Hotel burns to the ground on October 9.

The Santa Rosa Hilton Hotel burns to the ground on October 9.

A TV cameraman inches closer to a burning building at a winery in Napa Valley on Monday, October 9.

A TV cameraman inches closer to a burning building at a winery in Napa Valley on Monday, October 9.

Puddles of melted metal trail away from a burned-out car near Napa on October 10.

Puddles of melted metal trail away from a burned-out car near Napa on October 10.

Mary Caughey, center in blue, reacts after finding her wedding ring in the remains of her home in Kenwood on October 10.

Mary Caughey, center in blue, reacts after finding her wedding ring in the remains of her home in Kenwood on October 10.

Smoke clouds the sun from wildfires burning in Santa Rosa and Napa Valley on October 10.

Smoke clouds the sun from wildfires burning in Santa Rosa and Napa Valley on October 10.

Damaged winemaking vats and tanks stand in ashes and debris at the Paradise Ridge Winery in Santa Rosa.

Damaged winemaking vats and tanks stand in ashes and debris at the Paradise Ridge Winery in Santa Rosa.

The sign of a Firestone store malfunctions in Santa Rosa on Tuesday, October 10.

The sign of a Firestone store malfunctions in Santa Rosa on Tuesday, October 10.

Homes are destroyed in the Coffey Park neighborhood of Santa Rosa on October 11.

Homes are destroyed in the Coffey Park neighborhood of Santa Rosa on October 11.

Highway Patrol officers go door to door to ask Sonoma residents to evacuate their homes as a wildfire approaches on October 11.

Highway Patrol officers go door to door to ask Sonoma residents to evacuate their homes as a wildfire approaches on October 11.

Colby Clark, left, comforts her mother, Bonnie Trexler, after law enforcement escorted them to Trexler's home in Napa, California, to retrieve medicine and personal items on Wednesday, October 11. Trexler was one of the lucky few in her neighborhood whose home was spared. Deadly wildfires have been tearing through the state, destroying homes and businesses and prompting evacuation orders.

Colby Clark, left, comforts her mother, Bonnie Trexler, after law enforcement escorted them to Trexler's home in Napa, California, to retrieve medicine and personal items on Wednesday, October 11. Trexler was one of the lucky few in her neighborhood whose home was spared. Deadly wildfires have been tearing through the state, destroying homes and businesses and prompting evacuation orders.

Aerial images showing parts of Sonoma and Napa County that have been hit by wildfires.

Aerial images showing parts of Sonoma and Napa County that have been hit by wildfires.

The Santa Rosa house burned to the ground, along with decades of precious heirlooms.

"So many family heirlooms -- I thought my whole life, 'I'm going to inherit these someday. This is what I'm going to pass down to my kids.' "

Fifteen major wildfires are still tearing across California, scorching over 217,000 acres and destroying more than 5,700 structures.

JUST WATCHED Bodycam video shows dramatic wildfire rescue Replay More Videos ... MUST WATCH Bodycam video shows dramatic wildfire rescue 00:56

At least 41 people have been killed, including a driver of a water tender truck who died in a single-vehicle rollover early Monday, fire officials said. Sonoma County officials said 88 people are still reported missing in that county.

"This is truly one of the greatest, if not the greatest tragedy that California has ever faced," Gov. Jerry Brown said. "The devastation is just unbelievable, is a horror that no one could have imagined."

The good news: The two largest fires are about 60% contained, and rain later this week could help quell the flames.

A major pattern change will take place Thu-Fri as a system drops down from the Gulf of Alaska with a chance of rain in most areas#bayareawx pic.twitter.com/pRfGxpPPBr — NWS Bay Area (@NWSBayArea) October 16, 2017

But countless families are just now grappling with the reality of losing everything.

$3 billion in damages

Entire subdivisions and neighborhoods have been incinerated, leaving only ash, debris and scorched earth.

In Sonoma County, damages are expected to cost more than $3 billion, tweeted State Sen. Mike McGuire, who represents the North Bay.

There are simply no words to describe the sorrow. Initial damage assessments for unincorporated Sonoma Co are in: 3,819 destroyed parcels, $2.019 Billion. When Santa Rosa is combined, damage estimates top $3 billion. Unfortunately, estimates are expected to grow this week. pic.twitter.com/tplJC9euCh — Mike McGuire (@ilike_mike) October 16, 2017

Bret Gouvea, deputy chief of state firefighting service Cal Fire, said some fires are "just fighting us."

"They're not going easy, but we're getting them," he said.

Gouvea said fire officials are "cautiously optimistic."

"Our containment percentages are continuing to go up," he said.

Firefighting crews and supplies came from all over the country and even as far away as Australia, Cal Fire said.

Thank you to all our fire partners from across the U.S & Australia that came to California's aide during our greatest time of need. pic.twitter.com/0dljNiiB7i — CAL FIRE (@CAL_FIRE) October 16, 2017

"It's been our mission, our top priority, to get everybody back in their homes and back to some normalcy," Gouvea said.

It may take weeks for some residents to get back to their homes in scorched areas, Sonoma County Sheriff Sheriff Robert Giordano said.

"So, today, the theme word is patience," Giordano said. "Our goal is to get you back in. We're working as a team."

He said officials hope to reopen neighborhoods at some point and let residents return using checkpoints and escorts.

"So, you'll literally be able to show up at this place, say 'this is my home, here is my ID,' and you'll be escorted in to get things," the sheriff said.

Ash and debris could be 'very toxic'

Health officials warned residents returning home to be careful about sifting through their belongings.

The Tubbs Fire destroyed homes in Santa Rosa, California.

"The ash and the debris is very toxic. You have lots of chemicals and plastic and paint burned down," said Dr. Karen Relucio, public health officer in Napa County.

She advised that it could be hot and there could be sharp objects in the debris.

"We strongly urge you not to remove any large debris because this can release toxins into the air."

In Santa Rosa, a city about 50 miles northwest of San Francisco, Penny Wright was one of those who returned.

She tearfully walked through the debris of where her home once stood. With burned cars, concrete and twisted metal scattered everywhere, it was hard to tell which one was her house.

"All your life savings and work for all the years is gone," she said. "We lived here 10 years. I never thought that Santa Rosa would have a fire like this and we would lose everything."