American Society for Home Inspectors National Radon Proficiency Program American Association for Radon Scientists and Technologists



    A variety of methods can be used to reduce radon in homes. Sealing cracks and other openings in the foundation is a basic part of most approaches to radon reduction. EPA does not recommend the use of sealing alone to reduce radon. This method has not been shown to lower radon levels significantly or consistently by itself. In most cases, systems of pipes and fans are used to reduce radon. Such systems are called "sub-slab depressurization systems" and do not require major changes to your home. These systems prevent radon gas from entering the home from below the concrete floor and the foundation. Similar systems can also be installed in homes with crawl spaces. Radon reduction contractors may use other methods that may also work in your home. The right system depends on the design of your home and other factors.

    After a radon reduction system has been installed, there are a few important things to do to insure that radon in your home stays at a safe level.

  • Retest immediately after the installation to check that the system lowered your radon to safe levels. The retest must be completed no sooner than 24 hours after installation and within 30 days of installation. A retest should be completed every 1 to 2 years thereafter.

  • Environmental changes and construction to other properties that surround your home can affect levels in your home. Testing yearly will insure that your home has a safe level of radon.

  • Mitigation systems will require some amount of maintenance in addition to a small amount electricity. A fan in a mitigation system will last approximately 3 to 5 years. It is important to replace the fan as soon as it stops operating.

   Use of Activated Carbon to remove radon in drinking water


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