In principle any time if your home has not been tested yet. The EPA recommends that every REAL ESTATE transaction of a home in the United States includes a Radon test. Levels may vary due to local geological conditions, and due to seasonal long term conditions or short term fluctuations. This means that the Radon level in one home may be low in Summer, and high in Winter. Depending on the result of a test the EPA has established recommendations.Also the EPA recommends every home in the U.S. should be tested because the level of a home can not be used as an indication for the level of a neighboring home.

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