Mo. Rev. Stat. § 640.035

For any program relating to environmental control and the conservation and management of natural resources assigned to the department of natural resources or any division thereof, if the department maintains records of site inspections and violations of statutes, rules, or the terms or conditions of any permit by any entity subject to regulation by such program, the department shall also maintain records of compliance with such statutes, rules, or terms or conditions of any permit, and shall specifically record in such records any actions taken by the entity subject to regulation by the program that are above and beyond what is minimally required for compliance if the entity provides written notification of such action to the department at or before the time of the inspection.