The EPA recommends that radon mitigation systems (sometimes called radon remediation), be installed in homes with a radon concentration of 4 picocuries/liter or higher. For installation of a radon mitigation system and radon testing, it is best to hire a qualified mitigation company.
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These individuals or companies are often certified by state regulatory agencies such as the DEP (Department of Environmental Protection). If you do not have a state certification, you can look for a certified mitigator with NEHA (National Environmental Health Association). Ask for the state number or NEHA certification number of any radon mitigation company. If they offer estimates and a warranty, this will help you to choose.
The mitigation company will usually visit the home to determine which configuration is best and what size fan would work for what type of foundation it is. The system's cost can then be estimated. Once you have chosen the contractor, expect to wait 1-2 days for the installation.
Beware of the lowest bidder, as always. Ask for references and job examples. Also, inquire about the length of the contractor's existence.
After installation, it is recommended to test a radon mitigation device. After the system has been in operation for at least 24 hours, a test can be done. The initial test usually uses a short-term test. You can even search online for more information about radon mitigation.