Mo. Rev. Stat. § 319.137
Rules and regulations promulgated by the United States Environmental Protection Agency under subtitle I of the federal Resource Conservation Recovery Act of 1976 (P.L. 94-580), as amended, may be adopted by the department by reference. The department may adopt rules and regulations that are more stringent than those issued by the United States Environmental Protection Agency if such rules or regulations are necessary to protect human health or the environment. Any such rule shall be adopted only after due notice and public hearing in accordance with the provisions of this section, chapter 536, RSMo, and chapter 644, RSMo. No rule or portion of a rule promulgated under the authority of sections 319.100 to 319.139 shall become effective unless it has been promulgated pursuant to the provisions of section 536.024, RSMo.
(L. 1989 H.B. 77, et al. § 14, A.L. 1993 S.B. 52, A.L. 1995 S.B. 3)
*This section was amended by both S.B. 3 and H.B. 251 during the 1st Regular Session of the 88th General Assembly, 1995. Due to possible conflict, both versions are printed here.