*American Radon Mitigation Inc. guarantees that the annual average radon level in a client’s home will be 1.5 pCi/L or less for five years, beginning on the installation date, so long as all items on the bid are selected. The 1.5 pCi/L guarantee does not apply to certain property conditions or areas where the outdoor ambient radon concentration exceeds the national average of 0.4 pCi/L. See our Terms and Conditions for full details.