Arizona (AZ) - Radon Levels & Risk Assessment

Arizona is classified as EPA Zone 2 (Moderate Potential) for radon potential, with an average indoor radon level of 3 pCi/L. While below the EPA action level of 4.0 pCi/L, many individual homes test above the threshold and the EPA recommends considering mitigation even at these levels. Approximately 18% of homes in Arizona have radon levels above 4.0 pCi/L.

Radon Data for Arizona

Radon Risk in Arizona

As an EPA Zone 2 (Moderate Potential) state, Arizona has moderate radon potential. While not in the highest-risk category, many homes in the state test above the EPA action level, especially those with basements or those built on certain geological formations. The average indoor radon level of 3 pCi/L is below the EPA action level but above the level where the EPA suggests considering mitigation.

Testing and Mitigation in Arizona

While Arizona does not mandate radon testing, it is strongly recommended by both the EPA and state health agencies. Many home buyers include radon testing as part of their home inspection. The average cost of radon mitigation in Arizona is $1,100, which is below the national average. Professional radon testers and mitigators in Arizona can be found through the NRPP (National Radon Proficiency Program) or the NRSB (National Radon Safety Board) directories.

Protecting Your Home in Arizona

The EPA recommends that all homes in Arizona be tested for radon, regardless of the state's overall zone classification. If your home tests at 4.0 pCi/L or above, install a mitigation system. If your home tests between 2.0 and 4.0 pCi/L, the EPA suggests considering mitigation. New construction in Arizona may benefit from radon-resistant building techniques (RRNC), which are inexpensive to include during construction and can be easily activated later if radon levels are found to be elevated.

Use our radon risk assessment tool for a personalized estimate based on your home's characteristics, or browse all states to compare radon data across the country.