Top States That Have the Highest Radon Levels

Radon gas poses a serious health threat that many homeowners don’t think about. This radioactive gas seeps through cracks in foundations and accumulates in homes.

Geographic location plays a significant role in radon exposure levels. Certain states face higher risks due to their unique geological formations and soil compositions. Understanding which states have elevated radon levels helps homeowners make informed decisions about testing and mitigation. This list reveals the top states where radon concentrations are of concern, giving you the knowledge needed to protect your household.

Alaska

Alaska tops the list with some of the nation’s highest radon concentrations. The state’s permafrost conditions and unique geological formations contribute to elevated levels throughout many regions. Radon testing will keep your family safe in Alaska, where winter months mean homes stay sealed tight for extended periods, allowing gas to accumulate. Homeowners should focus on proper ventilation systems and consider installing radon mitigation systems before winter arrives.

South Dakota

South Dakota’s uranium-rich soil creates ideal conditions for radon production. The state’s geological composition includes granite and shale formations that naturally release radon gas. Many areas exceed the EPA’s action threshold of 4 picocuries per liter. Residents should test their homes regularly, especially those built on or near granite bedrock.

Pennsylvania

Pennsylvania’s diverse geological landscape includes areas with high uranium content in bedrock and soil. The state’s Reading Prong geological formation contains granite and gneiss that naturally produce elevated radon levels. Older homes built before modern construction techniques may face higher infiltration rates. Installing vapor barriers during construction and sealing foundation cracks can significantly reduce radon entry points.

Ohio

Ohio faces radon challenges due to its glacial deposits and shale formations. The state’s varied terrain includes areas where glacial materials contain elevated uranium concentrations. Lake Erie’s influence on soil composition also contributes to higher radon potential in northern regions. Homeowners should pay special attention to basement areas and crawl spaces where radon typically accumulates first.

Washington

Washington’s volcanic soil and geological diversity create varying radon levels across different regions. Areas near the Cascade Range often experience higher concentrations due to granite intrusions and volcanic deposits. The state’s rainy climate can also affect soil gas movement patterns. Professional radon testing becomes particularly important in mountainous regions and areas with volcanic soil composition.

Regular radon testing strategies protect families from this invisible threat. Contact certified radon professionals in your area to assess your home’s current levels and discuss appropriate mitigation options for your specific situation. If you live in any of the above states with high radon levels, please make sure you stay on top of radon mitigation techniques to remain safe. Your family and friends will thank you.