Seattle, WA – As winter weather continues across Washington and homes remain closed up to keep out the cold and rain, health officials are warning residents—especially those in Seattle and surrounding Puget Sound communities—about a dangerous indoor health threat that often goes unnoticed. January marks National Radon Action Month, drawing attention to radon gas, commonly referred to as the “invisible killer” inside the home.
According to the U.S. Environmental Protection Agency (EPA), radon is a naturally occurring radioactive gas released from soil and rock. It can seep into homes through foundation cracks, basements, crawl spaces, and utility openings. While parts of western Washington are often viewed as lower risk, officials say elevated radon levels have been detected in homes across the state, particularly in eastern Washington and pockets of the Puget Sound region.
Health experts say winter creates favorable conditions for radon buildup. In Seattle and across Washington, homes are sealed for long periods during colder, wetter months, allowing radon to accumulate indoors. Long-term exposure to radon is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths each year. Smokers face the highest risk, but non-smokers are also vulnerable.
Unlike carbon monoxide, radon exposure does not cause immediate symptoms. Medical professionals warn the damage often occurs silently over many years, making home testing the only reliable way to detect elevated radon levels.
State health officials recommend that all Washington residents test their homes, especially during winter months. Test kits are affordable and widely available, and mitigation systems can significantly reduce radon levels when elevated readings are found.
As National Radon Action Month continues, officials urge Washingtonians to test now to help protect their families from a serious but preventable health risk.
