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Harvey: 'Unprecedented' flooding 'beyond anything experienced' inundates Houston area, kills at least 3 - ABC News

More than 185,000 homes have been damaged or destroyed as a result of Harvey, according to the Texas Division of Emergency Management.

Those numbers will certainly continue to "tick up," Tom Vinger from that agency told ABC News.

And approximately 80 percent of Texans lack flood insurance, according to data from the Texas Department of Insurance.

"There are 2.8 million residential policies in the counties on our list and 516,295 federal flood policies," Stephanie Goodman from the Texas Department of Insurance told ABC News. "These numbers start to give you a sense of how many homeowners in the area won't have coverage for most of the damage to their homes."

"That's the second wave of tragedy," Goodman added.

In terms of how Harvey stacks up against other storms, Harvey is still estimated to cost less than Hurricane Katrina, which caused $118 billion in damage when it hit New Orleans in 2005. But Harvey is projected to surpass Superstorm Sandy, which caused $75 billion in damage when it hit the eastern seaboard in 2013.

“Homeowners without flood insurance are eligible for FEMA assistance,” Goodman said.

About 440,000 Texans have registered for assistance from FEMA and the agency has approved more than $70 million in funds, Gov. Abbott said today.

Additionally, while most Texas do not have flood insurance, most homeowners are insured for wind damage. Texans have filed an estimated 100,000 windstorm damage claims and 100,000 auto insurance claims so far, according to Mark Hanna, a spokesman for the Insurance Council of Texas, a trade group that represents the state's insurers.