C.R.S. § 12-165-110

(1) A licensed radon measurement professional shall: (a) Conduct all radon measurements in accordance with the applicable ANSI/AARST radon measurement standard or other applicable national consensus radon measurement standard approved by the director; (b) Maintain a quality control program plan in accordance with the applicable ANSI/AARST standard; (c) Ensure all radon measurements are conducted by, or under the direct supervision of, a licensed radon measurement professional; (d) Use and sell only radon measurement devices approved by the proficiency program that certified the licensee; and (e) Procure all laboratory analysis through a radon laboratory that is approved by a proficiency program. (2) A licensed radon mitigation professional shall: (a) Conduct all radon mitigation in accordance with the applicable ANSI/AARST radon mitigation standard or other applicable national consensus radon mitigation standard approved by the director; (b) Maintain a quality control program plan in accordance with the applicable ANSI/AARST standard; (c) Ensure all radon mitigation is conducted by, or under the direct supervision of, a licensed radon mitigation professional; and (d) Modify and repair all radon mitigation systems in accordance with the applicable ANSI/AARST radon mitigation standard.