Mo. Rev. Stat. § 640.128: Voluntary reporting by permit holders, department to notify local and state health departments of potential risks.

If an entity that holds a permit issued under chapter 644 or under sections 640.100 to 640.140 voluntarily reports to the department of natural resources the results of any water quality testing conducted by the entity, and such results indicate a potential risk to public health, the department shall immediately notify the local public health authority and the department of health and senior services.