Code of Federal Regulations Title 41. Public Contracts and Property Management § 41.102–80.20 What are Federal agencies' responsibilities concerning the abatement of radon?

(a) Retest abated areas and make lessors retest, as required, abated areas to adhere to EPA standards.

(b) Test non-public water sources (in remote areas for projects such as border stations) for radon according to EPA guidance. Radon levels that exceed current applicable EPA standards must be mitigated. Federal agencies must retest, as required, to adhere to EPA standards.