Mo. Rev. Stat. § 260.433: Commercial hazardous waste facilities, prohibited activities (third or fourth class counties).

No person or entity shall operate a commercial hazardous waste facility in any third or fourth class counties by engaging in:

(1) Open burning of hazardous waste; or

(2) Open burning of waste explosives; or

(3) Detonation of waste explosives; or

(4) Any other thermal treatment of any hazardous waste or waste explosives, unless in a manner consistent with the department's standards for owners/operators of permitted hazardous waste treatment, storage, and disposal facilities.