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Major Real Estate Website Now Shows Flood Risk. Should They All?

Aug 26, 2020
Originally published on August 28, 2020 3:41 pm

Updated Friday, 4:30 p.m. ET

Millions of people rely on real estate websites when they're hoping to buy or rent a home. Major sites such as Zillow, Redfin, Trulia and feature kitchens, bathrooms, mortgage estimates and even school ratings. But those sites don't show buyers whether the house is likely to flood while they're living there.

Now, has become the first site to disclose information about a home's flood risk and how climate change could increase that risk in the coming decades, potentially signaling a major shift in consumers' access to information about climate threats.

"People are buying property with little knowledge of whether it's going to flood or not," says Harriet Festing, co-founder of the advocacy group Higher Ground, which connects people across the country who have survived floods. "It ruins lives."

Still, other websites such as Redfin, Zillow and Trulia have no plans to share information about flooding with users. Millions of buyers risk overpaying for homes likely to be hit with a natural disaster over the course of a 30-year mortgage. But representatives for other realty sites say home sellers are reluctant to publish flood risk information, since it could decrease their home's value.

The last to know says each of the approximately 110 million home listings on its site now includes both publicly and privately assembled flood risk information.

The public data is about whether the house is located in a flood zone, as determined by the Federal Emergency Management Agency. Some homes in a FEMA flood zone are required to have flood insurance, and such policies are generally more expensive because there's more risk.

But federal flood maps do not cover the whole country and do not account for rising seas or extreme rain, trends driven by climate change that make flooding more likely in the future in many places.

"Unfortunately, inaccurate FEMA flood maps and nonexistent or weak real estate disclosure laws make it extremely difficult for home buyers to learn of a property's flood risk or even its flood history," says Joel Scata, who studies flood risk at the Natural Resources Defense Council.

The lack of reliable federal information about future flood risk has led corporations to either do their own studies or purchase private flood models. In recent years, that has meant that developers, insurers and banks increasingly have more detailed scientific information about flood risk in a given neighborhood than the people who live there.

"There's for-profit companies and commercial actors that are taking this data, taking this knowledge, and using it to have an advantage to buy or sell homes. They're using this at an advantage over your everyday American," says Matt Eby, one of the co-founders of the private First Street Foundation, which has spent the past few years modeling flood risk across the country to make such information available to the general public. He adds: "A democratization of this data is how we like to think about it."

In June, First Street published nationwide flood risk information for millions of properties. People can search for an address, a ZIP code or a city and see how likely it is to flood now, and how likely it is to flood in the next 30 years. It's also possible to compare the new flood analysis to FEMA's flood designation. Each property in the First Street database is assigned a score between 1 and 10, with 1 being the least flood risk and 10 being the most.

Beginning today, will publish those scores alongside FEMA's flood designation for every property on its site. It does not say whether the property has flooded in the past because such information is not publicly available.

Home listings on now include both federal and private flood risk information. Federal flood maps are primarily used to determine the cost of flood insurance and do not account for the future effects of climate change.

"It's really important for consumers to know this," says Leslie Jordan, senior vice president of product at People who are hoping to buy a house need to know the true cost of purchasing and maintaining the building, including the cost of insurance and repairing damage. If flooding is a potential problem, Jordan says they should know about it before they make an offer.

Disclosing flood risk for homes that are outside the official floodplain is important. About one-third of federal disaster money paid out to flood survivors goes to people who do not live in designated flood zones.

Jordan says there are things people can do to protect their homes against floods, but first they need to know that they are at risk. "They can elevate their home on stilts," she says. "They can add a sump pump into the basement. They can install a rain garden outside."

The Association of State Floodplain Management warns that people who are trying to mitigate flood risk should not rely solely on the Flood Factor score because the model underestimates flood risk for some properties and overestimates it for others. also sees flood risk disclosure as a competitive advantage. Jordan says: "The more transparent we can be about these properties — about all the data about them — the more consumers will trust us as a legitimate source to make their home-buying decisions."

Other websites holding off

For other popular real estate websites, such as Zillow, Redfin and Trulia, discussions about publishing flood risk have come up internally, but there are no current plans to follow's lead. Redfin representatives say the site is discussing how to test putting that information on its website.

"There are a number of challenges with that," says Jeff Tucker, an economist at Zillow. "It's something that I think, sooner or later, would be a great feature to include."

Zillow, through its research arm, has run its own analyses about how climate change could take a significant toll on housing nationwide, through both floods and wildfires.

"Hundreds of billions of dollars — just a tremendous amount of real estate at risk, primarily from coastal flooding, for instance," Tucker says.

Redfin has also done surveys showing that three-quarters of its buyers want information about natural disasters before purchasing a home.

"We don't want the lack of information to result in millions of dollars of overspending on housing," says Taylor Marr, lead economist at Redfin. "This is especially true, some preliminary research has found, in low-income minorities."

Still, the real estate websites say if they share flood risk, they expect pushback from home sellers who are concerned that it makes their home less desirable.

"We need to be very careful about how we provide information," Marr says. "Could this actually reduce the value of this existing homeowner and essentially take away a lot of their net worth?"

Marr says that in a competitive market, Redfin wouldn't want flood risk to crowd out the information that's most heavily used by prospective buyers.

"If we made the whole front page just about flood risk, they might not be as easily able to navigate how long the commute is, for example," Marr says.

Jordan, of, says her team did "extensive user testing" to figure out how to present flood risk information. In the end, they decided to put both the FEMA risk designation and the private flood risk score near the top of the listing. People who click on it get more detailed information about what the flood risk means.

Jordan also points out that anyone can look up a property's flood risk on First Street's website, which means that information could be part of real estate transactions whether current homeowners know about it or not. "The data is going to be figured out at some point," she says. "It's better that it be disclosed at the beginning."

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Many people who lose their homes in wildfires or in hurricanes did not know they were in harm's way. You can understand how this might happen. You know that the house is near the woods or near the coast. But you don't quite realize the risk, don't quite realize the extent of the danger. One major real estate site is now showing a home's flood risk along with photos of the kitchen and living room so that people will know. This is one way that climate change has become a more direct part of home-buying, a long-term decision that a lot of people make. Our reporting from NPR's climate team starts with NPR's Rebecca Hersher.

REBECCA HERSHER, BYLINE: It's obvious to a lot of Americans that climate change means more flooding.


UNIDENTIFIED REPORTER #1: More than 1,000 homes and businesses are flooded in the Jackson, Miss.

UNIDENTIFIED REPORTER #2: Southern Louisiana. More than 60,000 homes have been damaged...

UNIDENTIFIED REPORTER #3: Northwest of Omaha is still dealing with the mess...

UNIDENTIFIED REPORTER #4: More than 400 homeowners...

HERSHER: But even though government flood maps have been around since the '70s, there was no mention of flooding on real estate websites until today. Leslie Jordan is a vice president of the website, which lists more than 110 million homes.

LESLIE JORDAN: Flooding is the most common and costly natural disaster in the U.S.

HERSHER: So has added flood information to every listing. Jordan says that's thanks in part to a new, privately funded flood information project called Flood Factor. Matt Eby is one of the co-founders of Flood Factor, which rates houses on a scale from 1 to 10.

MATT EBY: So if it's very likely in a very deep flood, you'll get a flood factor of 10 for that property. If it's very unlikely, then it'll be a flood factor of 1.

HERSHER: The ratings take into account climate change, particularly sea level rise and more extreme rain. Eby says that kind of info has actually been out there for years. It's just that regular people haven't had access to it.

EBY: A democratization of this information is the way that we like to think about it, because there are people who already have this information. And they're already acting on it.

HERSHER: People like mortgage and insurance companies and large real estate developers, some of which have fought against public flood disclosure laws.

So are other real estate sites also going to add this flood information? Can you say?

EBY: We are hopeful and happy to engage in those conversations with folks.

HERSHER: And that less-than-specific answer made my colleague on NPR's climate team, Lauren Sommer, wonder, what is going on with the other real estate websites. So she called them.

LAUREN SOMMER, BYLINE: First up, I asked Zillow if they're thinking about publishing flood risk.

JEFF TUCKER: There are a number of challenges with that. And it's something that I think, sooner or later, would be a great feature to include.

SOMMER: Jeff Tucker is an economist at Zillow who has studied how the homes they help sell are at risk from climate change.

TUCKER: Hundreds of billions of dollars, yeah, just tremendous amount of real estate at risk primarily from coastal flooding, for instance.

SOMMER: Tucker says the company has had internal discussions about including flood risk. But they expect pushback from some users.

TUCKER: The current homeowners may be very unhappy to to have that kind of information surface if they're interested in selling their home.

SOMMER: I heard the same thing from Taylor Marr, lead economist at Redfin.

TAYLOR MARR: Could this actually reduce the value of this existing homeowner and, essentially, take away a lot of their net worth?

SOMMER: Marr says, on the buyer side, Redfin surveys show that three-quarters of them want to know about natural disasters before making an offer. But he says that info can't crowd out other info on the website.

MARR: If we made the whole front page just about flood risk, they might not be as easily able to navigate how long the commute is, for example.

SOMMER: Marr says they're looking at testing including flood risk. But there are no firm plans yet. Zillow and the other site it owns, Trulia, also have no plans to publish flood risk or info about any other climate-related disasters.

Lauren Sommer, NPR News.

(SOUNDBITE OF WMD'S "MOONPOOL") Transcript provided by NPR, Copyright NPR.