IRVINE, CA—RealtyTrac says 25 million US homes are in zip codes at high risk or very high risk for man-made environmental hazards—representing 38% of the 64 million homes in all zip codes analyzed.

The data firm recently released its second annual Manmade Environmental Hazards Housing Risk Report, which also shows that the combined estimated market value of the 25 million homes in high risk or very high risk zip codes was $6.9 trillion as of November.

For the report, RealtyTrac analyzed 7,751 zip codes with sufficient home price and appreciation data nationwide for the prevalence of five man-made environmental hazards: air quality, superfund sites, polluters, brown-fields and former drug labs. An index based on these five factors was assigned to each zip code, and index scores were divided into five categories of risk: very high, high, medium, low and very low.

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David Phillips

David Phillips is a Chicago-based freelance writer and consultant with more than 20 years experience in business and community news. He also has extensive reporting experience in the food manufacturing industry for national trade publications.