1.) Any Radon mitigation Contractor performing radon mitigation must be FL certified radon mitigation technician or specialist. It is illegal to install radon mitigations in the state or Florida without certification. 2.) Any Radon Mitigation Contractor must file for permit in much of Lee county and many municipalities within the county. If a contractor tells you a permit isn’t needed for his system, check with county officials. If that municipality requires a permit for radon mitigation, they mean every radon mitigation system, period. 3.) Make sure the radon mitigation contractor does not installs a radon mitigation system that can be controlled. Fort Myers Radon Authority has been called to dismantle a radon mitigation system that was blowing so much uncontrolled humidity into the home that a mold remediator proclaimed that the radon mitigation source for mold destruction. 4.) Ask the radon mitigation contractor for a copy of his liability insurance. If an accident occurs while installing the radon mitigation system. You will want to be sure that the contractor has suitable insurance to cover it. 5.) Make sure that the radon mitigation company reduced elevated radon to below 4.0 level. This level is acceptable to EPA and Florida Health. The only way to know what a radon level is, would be to measure/test for radon after the radon mitigation system has been installed.