Alaska | EPA Map of Radon Zones | Radon | Indoor Air Quality | Air | US EPA

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IMPORTANT: EPA also recommends

that this map be supplemented with

any available local data in order to

further understand and predict the

radon potential of a specific area.

Contact your state radon coordinator

(Click Here) to see if your state has

more detailed information available.

If you have questions about radon

in water Click Here.

PDF version of the National Map

(PDF, 1 page, 405KB)

EPA Map of Radon Zones

Alaska

The purpose of this map is to assist National, State, and local

organizations to target their resources and to implement radonresistant building codes. This map is not intended to be used to

determine if a home in a given zone should be tested for radon.

Homes with elevated levels of radon have been found in all three

zones. All homes should be tested regardless of geographic

location. Important points to note:

All homes should test for radon, regardless of

geographic location or zone designation

There are many thousands of individual homes with

elevated radon levels in Zone 2 and 3. Elevated levels

can be found in Zone 2 and Zone 3 counties.

All users of the map should carefully review the map

documentation for information on within-county

variations in radon potential and supplement the map

with locally available information before making any

decisions.

The map is not to be used in lieu of testing during

real estate transactions.

The Map was developed using five factors to determine radon potential: indoor radon

measurements; geology; aerial radioactivity; soil permeability; and, foundation type. Radon

potential assessment is based on geologic provinces. Radon Index Matrix is the quantitative

assessment of radon potential. Confidence Index Matrix shows the quantity and quality of the data

used to assess radon potential. Geologic Provinces were adapted to county boundaries for the Map

of Radon Zones.

Sections 307 and 309 of the Indoor Radon Abatement Act of 1988 (IRAA) directed EPA to list and

identify areas of the U.S. with the potential for elevated indoor radon levels. EPA's Map of Radon

Zones assigns each of the 3,141 counties in the U.S. to one of three zones based on radon

potential:

Zone 1 counties have a predicted average indoor radon screening level

greater than 4 pCi/L (pico curies per liter) (red zones)

Highest

Potential

Zone 2 counties have a predicted average indoor radon screening level

between 2 and 4 pCi/L (orange zones)

Moderate

Potential

Zone 3 counties have a predicted average indoor radon screening level less

than 2 pCi/L (yellow zones)

Low

Potential

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Your Home for

Radon?

Radon and Real Estate

Radon Resistant New

Construction (RRNC)

EPA Map of Radon

Zones

Radon in Drinking

Water

State Indoor Radon

Grants (SIRG)

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Teachers

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Alaska | EPA Map of Radon Zones | Radon | Indoor Air Quality | Air | US EPA

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Last updated on Friday, January 23rd, 2009.

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