Radon Blog

February 01, 2019

Radon: Impacts on People, Property and Infrastructure

Radon is the second cause of lung cancer in US. Is there Radon in Arizona? Yes, sure. It is not high like in other States but it is still present. And because of the general low levels, it is not a big concern for our State government although it is still very dangerous.

Several hot spots throughout the state.  Some of the more prominent radon hot spots include:  Tucson (the area around Cardinal Avenue); the Cave Creek Area; parts of the Verde Valley; and the Granite Dells near Prescott.  The US EPA recommends that all homes be tested for radon levels.

  • Elevated levels of radon are found in both new and old buildings.
  • Radon can be found in homes built on all types of foundations, including crawlspaces and slab-on-grade basements.
  • The percentage of Arizona homes that contain radon above recommended levels is similar to U.S. average.
  • The average radon level found in homes in the U.S. is about 1.4 pCi/L. In Arizona, the median of radon levels found in 4000+ homes during the state indoor radon survey (1987-89) was about 1.6 pCi/L.
  • Sub-floor ductwork for forced air furnaces and air conditioners can draw radon-laden soil gas into a home.
  • Radon levels in Arizona can often be higher in the summer air conditioning months than during months with milder temperatures.


Arizona and Radon Gas

Radon presence in Arizona is more severe than you might expect.

Arizona has been tracking radon test results since 1993, and based on these results:  

  • The average concentration of radon in homes in Arizona is 2.9 pCi/L
  • 1 in 4 homes in the state of Arizona are above the EPA recommended 4.0 pCi/L
  • The maximum concentration of radon found in a home in Arizona is 55.8 pCi/L
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