Until recently, when you looked at a house for sale on Zillow, you could see property-specific scores for the risk of flooding, wildfires, wind from storms and hurricanes, extreme heat, and air quality. The numbers came from First Street, a nonprofit that uses peer-reviewed methodologies to calculate “climate risk.” But Zillow recently removed those scores after pressure from CRMLS, one of the large real-estate listing services that supplies its data.

“The reality is these models have been around for over five years,” says Matthew Eby, CEO of First Street, which also provides its data to sites like Realtor.com and Redfin. (Zillow started displaying the information in 2024, but Realtor.com incorporated First Street’s “Flood Scores” in 2020.) “And what’s happened is the market’s gotten very

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