Radon Levels by State

Radon is a natural, odorless, colorless, tasteless, radioactive gas. Radon is most commonly found in uranium coated materials in the ground, therefore accumulating in subterranean areas such as basements and is emitted from the decay of uranium. It can also occur in some groundwater and hot springs. Climate change may cause previously trapped Radon underground to be released as permafrost thaws, especially in areas like Alaska, Canada, the Arctic, Greenland, and Russia.

Epidemiological studies have found that Radon can  cause cancer (it is the second-most cause of lung cancer, after smoking). Radon poisoning can lay dormant, showing no symptoms, for years. The United States Environmental Protection Agency (EPA) estimates one third of homes have radon levels greater than the recommended level (4.0 picocurie per liter).

See for yourself how radon levels change by state by surveying the data in the charts.

Average Radon Level by State

Alabama - Average Radon Level

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3.9

#30 in the US

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3,225

#8 in the US

Alaska - Average Radon Level

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10.7

#1 in the US

Arizona - Average Radon Level

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1.9

#46 in the US

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3,728

#1 in the US

Arkansas - Average Radon Level

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2.5

#39 in the US

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3,031

#15 in the US

California - Average Radon Level

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2.3

#40 in the US

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3,216

#10 in the US

Colorado - Average Radon Level

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6.8

#9 in the US

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3,535

#5 in the US

Connecticut - Average Radon Level

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3.4

#31 in the US

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2,262

#36 in the US

Delaware - Average Radon Level

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2.4

#41 in the US

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2,505

#27 in the US

Florida - Average Radon Level

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1.8

#47 in the US

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3,636

#3 in the US

Georgia - Average Radon Level

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2.3

#42 in the US

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3,277

#7 in the US

Hawaii - Average Radon Level

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0

#50 in the US

Idaho - Average Radon Level

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7.3

#4 in the US

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2,551

#24 in the US

Illinois - Average Radon Level

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5.3

#13 in the US

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2,506

#26 in the US

Indiana - Average Radon Level

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4.7

#20 in the US

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2,427

#30 in the US

Iowa - Average Radon Level

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6.1

#10 in the US

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2,375

#32 in the US

Kansas - Average Radon Level

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4.9

#21 in the US

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2,892

#18 in the US

Kentucky - Average Radon Level

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7.4

#5 in the US

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2,711

#20 in the US

Louisiana - Average Radon Level

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1.1

#48 in the US

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3,346

#6 in the US

Maine - Average Radon Level

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5.9

#14 in the US

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1,944

#49 in the US

Maryland - Average Radon Level

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5.4

#15 in the US

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2,499

#28 in the US

Massachusetts - Average Radon Level

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3.9

#32 in the US

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2,220

#38 in the US

Michigan - Average Radon Level

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3.5

#33 in the US

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2,045

#46 in the US

Minnesota - Average Radon Level

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4.6

#22 in the US

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2,076

#45 in the US

Mississippi - Average Radon Level

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1.2

#49 in the US

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3,221

#9 in the US

Missouri - Average Radon Level

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4.3

#23 in the US

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2,658

#22 in the US

Montana - Average Radon Level

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7.4

#6 in the US

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2,174

#40 in the US

Nebraska - Average Radon Level

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5.2

#16 in the US

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2,576

#23 in the US

Nevada - Average Radon Level

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3.4

#34 in the US

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3,197

#11 in the US

New Hampshire - Average Radon Level

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5.6

#17 in the US

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2,107

#42 in the US

New Jersey - Average Radon Level

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4.4

#24 in the US

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2,372

#33 in the US

New Mexico - Average Radon Level

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3.9

#35 in the US

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3,723

#2 in the US

New York - Average Radon Level

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4.2

#25 in the US

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2,140

#41 in the US

North Carolina - Average Radon Level

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4

#26 in the US

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2,968

#16 in the US

North Dakota - Average Radon Level

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6

#11 in the US

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1,987

#48 in the US

Ohio - Average Radon Level

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7.8

#7 in the US

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2,351

#34 in the US

Oklahoma - Average Radon Level

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2.5

#43 in the US

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3,099

#14 in the US

Oregon - Average Radon Level

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3.1

#36 in the US

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2,399

#31 in the US

Pennsylvania - Average Radon Level

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8.6

#3 in the US

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2,249

#37 in the US

Rhode Island - Average Radon Level

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4.3

#27 in the US

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2,210

#39 in the US

South Carolina - Average Radon Level

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2.4

#44 in the US

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3,179

#13 in the US

South Dakota - Average Radon Level

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9.6

#2 in the US

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2,268

#35 in the US

Tennessee - Average Radon Level

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4.8

#28 in the US

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2,910

#17 in the US

Texas - Average Radon Level

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2.1

#45 in the US

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3,538

#4 in the US

Utah - Average Radon Level

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4.4

#29 in the US

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3,191

#12 in the US

Vermont - Average Radon Level

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3.7

#37 in the US

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2,004

#47 in the US

Virginia - Average Radon Level

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3.6

#38 in the US

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2,710

#21 in the US

Washington - Average Radon Level

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7.5

#8 in the US

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2,088

#44 in the US

West Virginia - Average Radon Level

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6.1

#12 in the US

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2,527

#25 in the US

Wisconsin - Average Radon Level

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5.7

#18 in the US

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2,098

#43 in the US

Wyoming - Average Radon Level

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5

#19 in the US

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2,794

#19 in the US