Mo. Rev. Stat. § 49.079: County commission to appoint sewer supervisor — compensation and duties, how fixed (certain second class counties).

The county commission in all counties of the second class having a population of over thirty thousand inhabitants and containing a part of a city having a population of more than four hundred fifty thousand inhabitants may appoint a sewer supervisor and fix his compensation. The sewer supervisor shall supervise the construction and extension of sewers within the county and shall have the other duties that the county commission may provide.