Mo. Rev. Stat. § 204.618
7. The board of trustees shall have all of the powers necessary and convenient to provide for the operation and maintenance of its treatment facilities and the administration, regulation, and enforcement of its pretreatment program, including the adoption of rules and regulations to carry out its powers with respect to all municipalities, subdistricts, districts, sewer corporations, and industrial users that discharge into the collection system of the district's sewer system or treatment facilities. These powers include, but are not limited to:
(L. 2007 S.B. 22)