(CNN) Fires have broken out over two days at a Texas chemical plant flooded by Harvey and more are expected, authorities said Friday.

Two containers burned Friday and one burned Thursday at the Arkema site northeast of Houston, Harris County Assistant Fire Chief Bob Royall said at a news conference.

Officials have decided to let the remaining six containers catch fire and burn out rather than endanger firefighters, the US Environmental Protection Agency and the Texas Commission on Environmental Quality said in a joint statement.

"The refrigeration units have been compromised due to the massive flooding, and therefore, we expect these containers to catch fire similar to the way the first trailer did last night," the statement said.

Arkema shut down the facility as Hurricane Harvey approached last week. Employees and residents within 1.5 miles of the plant were evacuated as a precaution.

The company makes liquid organic peroxides used primarily in the production of common consumer products, ranging from headlights assemblies for the automotive industry, to PVC for pipes, packaging and siding.

Fifteen deputies exposed to smoke earlier were taken to the hospital and released later in the day, Harris County Sheriff Ed Gonzalez told CNN. Harris said the firefighters experienced a burning situation in their eyes and throats.

The EPA said it tested the smoke with aircraft and performed ground-level air quality monitoring as well. Neither testing method found toxic concentration levels in areas away from the evacuated facility, the EPA said.

Authorities and Richard Rennard, a senior executive with Arkema, said officials thought the 1.5-mile evacuation zone was enough to ensure public safety. Flooding and power loss combined to make portions of the plant in Crosby combustible.

"This played out like we expected it to," Rennard said. "Product will warm up, degrade and catch fire."

Sam Mannan, a Texas A&M chemical engineering professor, said that it's possible long-term exposure to the smoke could cause health problems.

"This is not something we should treat as something we should not be concerted about," he said.

US Rep. Sheila Jackson Lee of Texas said the EPA should intervene to make sure the numerous chemical plants and refineries in the Houston area don't pose a threat to the public. "The safety of millions are at stake and we cannot afford to risk another disaster," she said in a news release.

Death toll hits 50

The rain, mercifully, has stopped in southeast Texas. But a week after Hurricane Harvey, boaters still are shuttling people away from a few high-water areas as millions struggle with what the storm has left -- tens of thousands of destroyed homes and altered lives, and grim efforts to find those who may not have survived.

At least 50 people have died from the storm. Other statistics only begin to hint at the scope of the punishing deluge and what the months of recovery will entail:

About 27 trillion gallons of rain fell on Texas and Louisiana over six days -- enough to fill the Houston Astrodome 85,000 times.

More than 72,000 people have been rescued.

And about 136,000 structures were flooded in Harris County, home of Houston, alone -- about 10% of the structures on record there, the county says.

Flooding danger is far from over in places such as Beaumont, Texas, a city of 118,000 dealing with a cruel juxtaposition: inundated in spots with floodwater as its residents lack flowing tap water because two pumps there failed.

"The river ... on the east line of our city should crest today, and it will start falling, (but) our biggest situation is the water supply is cut off," said Capt. Brad Pennison of Beaumont's fire department.

Gov. Greg Abbott said in a press conference Friday the Neches River's water level continues to rise, and is nearly 7 feet above the record.

The loss of drinking water has forced an evacuation of patients from Beaumont's Baptist Hospital . Patients in intensive care already have been airlifted or taken by ambulance to other facilities, but officials still plan to evacuate 85 people -- including 11 babies born prematurely and three other newborns -- who remained there Friday morning.

Dr. Snehal Doshi, who runs the hospital's neonatal intensive care unit, said several preemies' parents had been prevented from visiting their infants because of flooding elsewhere.

"There are some parents who simply haven't seen their babies for days, just because it's not safe for them to come to the hospital," he said.

Thursday night, 600 pallets of water and 400 pallets of meals were delivered, Abbott said, though he didn't specify where. He said the city is "working aggressively" to repair the water system.

Engineers from ExxonMobil and other companies have been working with government officials to help Beaumont residents get access to water.

Ashley Alemayehu, spokeswoman for ExxonMobil, told CNN's Brian Todd the teams are working on a "temporary solution" to get water to residents' homes, but that there were "still a lot of steps that still need to be completed," such as water treatment.

The city still had no timeline on getting running water to Beaumont residents, Alemayehu said.

"I'm hopeful to take a shower tonight," she said.

For city residents, officials ordered bottled water and set up distribution points

Debris sits on a sidewalk Thursday in the Twin Oaks Estate neighborhood of Houston.

Mayor: $75 million or more needed to remove debris

Houston's mayor, meanwhile, made a public plea to the federal government: Advance money and other assistance quickly. Most of Houston is drying out, and people are starting to pile debris in front of their homes, Mayor Sylvester Turner said.

Photos: Hurricane Harvey slams Texas Photos: Hurricane Harvey slams Texas Downtown Houston is seen behind the flooded Buffalo Bayou a few days after Hurricane Harvey came ashore in August 2017. The Category 4 storm caused historic flooding. It set a record for the most rainfall from a tropical cyclone in the continental United States, with 51 inches of rain recorded in areas of Texas. An estimated 27 trillion gallons of water fell over Texas and Louisiana during a six-day period. Hide Caption 1 of 22 Photos: Hurricane Harvey slams Texas NASA astronaut Jack Fischer photographed Hurricane Harvey from the International Space Station. Hide Caption 2 of 22 Photos: Hurricane Harvey slams Texas Steve Culver comforts his dog Otis in the hurricane aftermath. Harvey destroyed most of his home in Rockport while he and his wife were there. Hide Caption 3 of 22 Photos: Hurricane Harvey slams Texas Houston police officer Daryl Hudeck carries Catherine Pham and her 13-month-old son, Aiden, after rescuing them from floodwaters. Hide Caption 4 of 22 Photos: Hurricane Harvey slams Texas A damaged home is seen in the Key Allegro neighborhood of Rockport. Hide Caption 5 of 22 Photos: Hurricane Harvey slams Texas A car is submerged by floodwaters on a freeway near downtown Houston. Hide Caption 6 of 22 Photos: Hurricane Harvey slams Texas Melani Zurawski cries while inspecting her home in Port Aransas, Texas. Hide Caption 7 of 22 Photos: Hurricane Harvey slams Texas A graveyard is flooded in Pearland, Texas. Hide Caption 8 of 22 Photos: Hurricane Harvey slams Texas Soldiers with the National Guard patrol Rockport, looking for residents trapped in their homes. Hide Caption 9 of 22 Photos: Hurricane Harvey slams Texas Evacuees are loaded onto a truck in Houston. Hide Caption 10 of 22 Photos: Hurricane Harvey slams Texas People push a stalled pickup through a flooded street in Houston. Hide Caption 11 of 22 Photos: Hurricane Harvey slams Texas Rockport residents return to their destroyed home. Hide Caption 12 of 22 Photos: Hurricane Harvey slams Texas Rescue boats fill Tidwell Road in Houston as they help flood victims evacuate the area. Hide Caption 13 of 22 Photos: Hurricane Harvey slams Texas People wait to be rescued from their flooded home in Houston. Hide Caption 14 of 22 Photos: Hurricane Harvey slams Texas Volunteers in Dallas organize items donated for hurricane victims. Hide Caption 15 of 22 Photos: Hurricane Harvey slams Texas When Harvey slammed the Texas coast and flooded much of Houston, volunteers sprang into action. Some came from as far away as the Florida Everglades, boats in tow, ready to rescue people trapped in their homes. Hide Caption 16 of 22 Photos: Hurricane Harvey slams Texas Larry Koser Jr. and his son Matthew look for important papers and heirlooms inside a flooded home in Houston. Hide Caption 17 of 22 Photos: Hurricane Harvey slams Texas Members of the National Guard rest at a furniture store in Richmond, Texas. Hide Caption 18 of 22 Photos: Hurricane Harvey slams Texas Volunteer rescue workers help a woman from her flooded home in Port Arthur, Texas. Hide Caption 19 of 22 Photos: Hurricane Harvey slams Texas This aerial photo shows flooded residential neighborhoods in Houston. Hide Caption 20 of 22 Photos: Hurricane Harvey slams Texas Tammy Dominguez and her husband, Christopher, sleep on cots at the George R. Brown Convention Center, where thousands of people were taking shelter in Houston. Hide Caption 21 of 22 Photos: Hurricane Harvey slams Texas An elderly patient waits to be rescued from the Gulf Health Care Center in Port Arthur. The facility was evacuated with the help of first responders and volunteers. Hide Caption 22 of 22

"We need immediately, right now, just for debris removal alone, anywhere between $75 million to $100 million," Turner told CNN's "New Day."

"We need housing assistance. We need an army of FEMA agents on the ground to be assisting people, not just in shelters, but (also) people who are in their homes, so we can get them financial assistance they need (so) they can start transitioning."

The rate of rescues in Harris County has slowed, but some still were happening in high-water areas Friday morning, especially in the western part, Sheriff Ed Gonzalez said.

Janice Forse cries at a shelter this week in Beaumont, Texas, after her home was flooded.

Firefighters and other emergency personnel are going door-to-door "to make sure we have not missed anyone ... especially seniors or people who are disabled," the mayor said.

Some flooding in western Houston happened because the US Army Corps of Engineers intentionally released water from two reservoirs, Turner said.

Officials have said it was safer for nearby neighborhoods if the Corps managed the water with controlled releases instead of letting uncontrolled water flow over the edge of the reservoirs as more rain was predicted.

Turner and other officials have pointed to small signs of recovery, such as fewer people in shelters, more bus lines resuming and the city's shipping channel reopening on a limited basis.

The Houston Independent School District, which postponed its school-year opening Monday because of the storm, plans to start classes on September 11 for its 200,000-plus students.

Drivers in Dallas waited in long lines for gasoline following social media reports of a Harvey-driven fuel shortage. But petroleum analysts told CNN the run didn't owe to a dearth of supply but to the horde of drivers who panicked.

"There's plenty of fuel, plenty of gasoline in the United States of America," Gov. Greg Abbott told Texans in a press conference. "There's plenty of gasoline in the state of Texas."

Abbott said the state was working with refineries, pipelines, trucking companies and retailers to ensure that more gasoline was on the way. Oklahoma, Louisiana and New Mexico are all sending fuel, and a pipeline that was sending gasoline from Texas to Oklahoma has been reversed.

About 440,000 registered requesting emergency assistance

While promising federal aid, President Donald Trump's homeland security adviser also predicted more misery.

"We will see additional losses of life, if history is any precedent here," Tom Bossert told reporters Thursday.

"You should continue to have confidence in what we're doing as a government," Bossert said. "But I would be remiss if I didn't stop and say that none of that matters if you're an affected individual."

Trump personally plans to donate $1 million to help storm victims, according to the White House.

Abbott said that more than 440,000 people have registered for emergency assistance from the Federal Emergency Management Agency, which has approved $79 million to help victims of the storm.

Overheated organic peroxides caused blasts at a chemical plant in Crosby.

After Hurricanes Katrina and Rita hit the Gulf Coast in 2005, $5.8 billion in individual assistance money was given to nearly 916,000 people affected by those storms.

Trump is expected to visit Houston and other areas Saturday, his second trip to the region this week.

As the government worked to help those affected by Harvey, another storm, Hurricane Irma , loomed in the Atlantic as a threat to Caribbean islands -- and potentially, by next week, to the United States.

'If I can get a martini, I'll be happy'

In a Houston neighborhood where floods have receded, Evelyn Hawkins returned to find that water had tossed furniture and other belongings in her home.

On Friday, members of her church came over to remove the soggy debris.

"I'm doing fine, thank the Lord," she said.

A few streets away, Willie Marie Burton returned to her house on Thursday -- her 66th birthday -- and saw the same kind of flooded ruin.

She sobbed for a few moments after surveying the damage, but moments later resolved to persevere.

"What I'm going to do after we go through some of this is, I just want to eat seafood. I love seafood," she said. "So if I can get some seafood, I'll be happy. And if I get a martini, I'll be happy. But if not, I'm just glad to be here."

'I did not think it was going to be this bad'

Across the state, families are searching tirelessly for missing relatives.

Residents evacuate their homes near Houston's Addicks Reservoir earlier this week.

Among the storm-related deaths were a Houston man who was electrocuted while walking in floodwater and a mother whose body was floating about a half mile from her car. Rescuers found her daughter clinging to her body. The child is in stable condition after suffering from hypothermia.

When #HurricaneHarvey keeps you from home on your birthday, you're serenaded over the phone by your daughter #HoustonStrong pic.twitter.com/ldHDHeBaaI — Houston Police (@houstonpolice) August 31, 2017

In Victoria, Texas, about 120 miles southwest of Houston, Mary Martinez returned to her heavily damaged home Wednesday.

"I did not think it was going to be this bad," said Martinez, who got help from volunteers with the Christian charity Samaritan's Purse. "I was speechless."