Radon gas is a colorless, odorless, tasteless radioactive gas that's formed during the natural breakdown of uranium in soil, rock, and water. Radon exits in the ground and can seep into your home through cracks and holes in the foundation. Radon gas can also contaminate well water.​

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Tier 1:     High potential – at least 25 homes tested with 25 percent or more having radon concentrations greater than or equal to 4 pCi/L

Tier 2:     Moderate potential – at least 25 homes tested with 5 to 24 percent having radon concentrations greater than or equal to 4 pCi/L

Tier 3:     Low potential – at least 25 homes tested with less than 5 percent having radon concentrations greater than or equal to 4 pCi/L

 

Regardless of the Tier designation, the Department recommends that all homes should be tested for radon. Radon concentration can vary widely within a tier location, depending upon the geology and amount of uranium in the soil. Homes in low or moderate radon potential areas can have elevated radon concentrations. The New Jersey Department of Environmental Protection and the U.S. Environmental Protection Agency both recommend that you take action to mitigate your home if your test results indicate radon levels of 4 pCi/L of radon or higher.