Mo. Rev. Stat. § 82.1031
No action shall be brought under section 82.1025 or sections 82.1027 to 82.1030 if the owner of the property that is the subject of the action is in good faith compliance with any order issued by the department of natural resources, the United States Environmental Protection Agency, or the office of attorney general.
(L. 2014 S.B. 731 § 1)
*Effective 10-10-14, see § 21.250. S.B. 731 was vetoed July 7, 2014. The veto was overridden on September 10, 2014.