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Radon Data for Property Management

Monitoring. Management. Mitigation.

ATTOM’s Radon Hazard Data Mitigates Risk

Radon is a radioactive gas and carcinogen that enters homes through contact points with the ground. Radon levels vary from household to household. ATTOM’s radon hazard data shows the measured radon levels in U.S. homes at the county level and by state, sourced from the U.S. Environmental Protection Agency (EPA). Are you living in a radon zone?

Our data is digitally mapped to show Zone 1, Zone 2, and Zone 3 counties in each state.

  • Zone 1 counties have predicted average indoor radon screening level greater than 4 pCi/L (picocuries per liter)
  • Zone 2 counties have predicted average indoor radon screening level greater than 4 pCi/L (picocuries per liter)
  • Zone 3 counties have predicted average indoor radon screening level less than 2 pCi/L (picocuries per liter)

Nearly one out of every 15 homes has a radon level 4 pCi/L or greater, which the EPA considers elevated. The U.S. average radon-in-air level in single family homes is 1.3 pCi/L. The EPA recommends mitigation measures for homes if an occupant’s long-term exposure will average 4 picocuries per liter (pCi/L) or higher.

ATTOM Radon Data

With ATTOM’s radon risk data, property owners and developers in radon zones can decide whether they should take mitigation measures. For example, increasing under-floor ventilation, installing a radon sump system in the basement or under a solid floor; sealing floors and walls; or improving ventilation.

How Can You Use ATTOM’s Radon Risk Data?

Distressed Property Owners

Real Estate

Homebuyers, investors, and their representatives need accurate radon zone map data when considering a property acquisition. ATTOM shows radon risk down to individual property listings.
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New Borrowers


Local government and researchers rely on accurate and frequent radon testing and data as they strive to protect communities from environmental hazards and health threats.
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Distressed Property Owners

Home Services

Home service companies, such as radon mitigation system installers, can identify radon zones, as well as potential clients.
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New Borrowers

Construction Developers

Both public and private developers rely on environmental risk data to build robust structures that mitigate the threat of radon.
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