California’s real estate industry is pushing back against climate risk disclosures. As a result, buyers across the state may soon lose access to critical weather-related data they have learned to rely on.
Most notably, Zillow has already removed extreme weather risk data from many California listings. Now, meanwhile, other major real estate platforms are facing similar pressure.
At the center of the controversy is whether climate risk transparency helps buyers or hurts sales.
Zillow Pulls Climate Risk Data from California Listings
Zillow, the nation’s largest real estate listing website, recently removed extreme weather risk scores that showed buyers whether a home faced higher dangers from:
- Flooding
- Wildfires
- High winds
- Extreme heat
- Air quality
Previously, this data helped buyers assess whether the largest purchase of their lives carried long-term climate exposure.
However, after pressure from California’s real estate trade groups, Zillow quietly pulled the visibility of these risk indicators.
According to Zillow, the decision was made to comply with Multiple Listing Service (MLS) rules and maintain a “consistent experience.”
You can read Zillow’s official news updates here:
👉 https://www.zillow.com/research/
Who Is Applying the Pressure?
The pressure is coming primarily from the California Regional Multiple Listing Service (CRMLS), one of the largest private real estate data providers in the country.
CRMLS supplies listing data to:
- Zillow
- Realtor.com
- Redfin
- Homes.com
Because of this, any change in CRMLS policy carries immediate statewide consequences.
Art Carter, CEO of CRMLS, claimed that some future flooding projections were inaccurate, especially in parts of California that haven’t experienced flooding for decades.
As a result, CRMLS formally requested that all major platforms remove First Street’s predictive climate models from their listings.
CRMLS Official Site:
👉 https://go.crmls.org
The Role of First Street Foundation’s Climate Data
The contested data comes from First Street Foundation, a private climate risk modeling company.
Their models estimate both current and future disaster risks, including:
- Flooding
- Wildfires
- Coastal surge
- Air quality
- Heat exposure
First Street argues that its data is more comprehensive than FEMA flood maps, which are often outdated.
First Street Official Site:
👉 https://firststreet.org
Evidence Shows the Data Affects Home Sales
Importantly, the impact of climate risk disclosure is already measurable.
According to Zillow’s own internal analysis:
- Only 52% of homes with high flood risk sold by March 2025
- Meanwhile, 71% of homes with low flood risk sold in the same time period
In other words, climate risk exposure appears to directly reduce buyer demand.
Because of that, industry groups argue that these risk labels damage home values and slow transactions, especially in already fragile markets.
This slowdown mirrors broader shifts across the state, where affordability already strains demand:
👉 https://temblog.org/bay-area-luxury-homes-keep-rising-while-mid-tier-housing-slips-behind/
First Street Defends Its Accuracy After L.A. Wildfires
However, First Street strongly disputes claims that its data is unreliable.
Following the January Los Angeles wildfires, First Street reported that its wildfire risk maps accurately identified:
- Over 90% of the homes that later burned as “severe” or “extreme” risk
By contrast, California’s official hazard maps had classified only 21% of those same homes as “very high risk.”
As a result, the state has already begun revising its wildfire risk modeling.
According to First Street CEO Matthew Eby:
“When buyers lack access to clear climate-risk information, they make the biggest financial decision of their lives while flying blind.”
Scientists Warn About Private Data Models
Although climate models are improving, scientists warn that property-level predictions still vary widely.
Oriana Chegwidden, a research scientist at nonprofit CarbonPlan, explained that:
- Many climate modeling firms refuse independent audits
- Only 2 of 9 companies agreed to open their models for verification in a 2024 study
- First Street declined to participate
CarbonPlan Official Site:
👉 https://carbonplan.org
As a result, while climate modeling influences:
- Insurance approval
- Mortgage validation
- Home resale value
The public currently has limited ability to verify how those models work.
Why the Dispute Is Happening Now
Notably, this conflict did not arise during the pandemic-era real estate boom.
Instead, it is happening during one of the toughest housing markets in decades, marked by:
- High mortgage rates
- Slowing transactions
- Insurance instability
- Tight inventory
As pressure to close deals increases, climate risk has become a financial obstacle instead of a planning tool.
This financial stress appears across California markets, including fast-rising rental zones like Gilroy:
👉 https://temblog.org/gilroy-rent-trends-december-2025-average-rent-hits-2000/
At the same time, massive construction projects continue reshaping supply:
👉 https://temblog.org/the-new-bay-area-5-mega-projects-reshaping-the-real-estate-landscape-in-2025/
Redfin and Realtor.com Take a Different Position
Unlike Zillow, Redfin has chosen to keep climate risk data visible.
According to Redfin:
“Every home is different and no model is perfect. Sellers can request removal if they believe the data is inaccurate.”
Redfin Official Site:
👉 https://www.redfin.com/news/
Meanwhile, Realtor.com says it is still evaluating the issue while working with CRMLS.
Realtor.com Official Site:
👉 https://www.realtor.com/news/
What This Means for California Buyers
Ultimately, this conflict highlights a growing divide:
On one side:
- Buyers want transparency
- Insurers demand precision
- Lenders fear exposure
On the other side:
- Brokers want faster sales
- Sellers want stronger valuations
- Platforms want regulatory compliance
If climate risk data disappears, buyers may face:
- Higher insurance costs after purchase
- Unexpected flood or wildfire losses
- Reduced resale value
- Long-term affordability stress
Final Takeaway
Climate risk data is no longer just a consumer-protection tool.
Instead, it has become a financial fault line in California real estate.
As pressure mounts on Zillow, Redfin, and Realtor.com, buyers may soon be forced to evaluate climate exposure without clear public data.
In a state already facing affordability strain, wildfire threats, and insurance retreat, that transparency gap could shape the next phase of California housing.
