C.R.S. § 12-165-107

(1) This article 165 does not apply to: (a) Intentionally left blank —Ed. (I) An individual performing radon measurement or radon mitigation on a single-family residence that the individual owns and occupies; or (II) An individual performing radon measurement on a leased dwelling unit that the individual leases or occupies; (b) An individual performing radon measurement who assists and is under the direct supervision of a licensed radon measurement professional; (c) An individual performing radon mitigation who assists and is under the direct supervision of a licensed radon mitigation professional; (d) An agent of a federal, state, or local government agency acting within the scope of the agent’s official capacity; (e) An individual performing radon measurement or radon mitigation as part of radon training approved by a proficiency program; or (f) An individual acting within the scope of practice for which the individual is licensed, registered, or certified;