I recently learned that approximately 25% of homes in the Wasilla real estate market that are tested for radon gas exceed recommended EPA maximums for suggested mitigation.
    Radon is a radioactive gas. It comes from the natural decay of uranium that is found in nearly all soils. It typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation. Your home traps radon inside, where it can build up. Any home may have a radon problem. This means new and old homes, well-sealed and drafty homes, and homes with or without basements

    Above is a map showing the areas (in orange) in Alaska that have “moderate potential” for higher levels of radon gas.  As you can see, the Mat-Su Borough is included in that zone.
    Radon leads second-hand smoke a cause of lung cancer.  It is estimated that every year 21,000 people in the US die from lung cancer caused by radon gas. 
    Fixing the problem is usually not all that difficult.  A typical radon mitigation system can cost as litlle as a few hundred dollars or a much as several thousand.  Many new homes are being constructed with mitigation systems roughed in at a very small initial cost.  Others are built as radon-resistant.  I think it's money well spent.... Ray Wood

Here are some places where you can learn more about radon gas:
Alaska radon information sources
Radon publications
Radon in drinking water
How to test for radon
About.com
Do-It-Yourself radon mitigation