Mo. Rev. Stat. § 249.430: Definitions.

For the purpose of sections 249.430 to 249.660, the following definitions will apply:

(1) "Lateral sewer district" shall mean all of the area served by a lateral area;

(2) "Main sewer district" shall include all of the area in, and including the watershed, and including the area of any submain and lateral sewer districts served by the main sewer;

(3) "Submain sewer district" shall mean all of the area served by a submain sewer district and shall include the area of any lateral sewer district served by a submain sewer.