Mo. Rev. Stat. § 249.040
Upon the filing of such petition and bond the circuit court is hereby directed, within ten days thereafter, to appoint a competent sanitary engineer who may be an individual, copartnership, or a corporation, to lay out and define the boundaries of the proposed sewer district. The said engineer shall subscribe an oath to faithfully discharge his duties as such engineer and to make a true report of the work done and the facts ascertained by him. The said engineer may alter or amend the boundaries of the proposed district as set forth in the petition, so that the boundaries may embrace all of the area capable of being efficiently served or drained by the system of sewers, or so as to exclude from the sewer district any part of the natural drainage area which is so situated as not to be benefitted by the proposed system of sewers and for this purpose shall have power to make all surveys, maps, and do all things necessary to locate and describe said boundaries. If the engineer finds the proposed sewer system would be for the preservation of the public health or public welfare or will be of public utility or benefit he shall so report and in said report he shall state approximately the proper plan of and the location of the system of sewers and the probable cost of the improvement necessary to accomplish the objects of the petition. The engineer shall report his findings in writing, with such maps, profiles, drawings and other data as are necessary to advise the court in the premises and shall promptly file the same with the clerk of the circuit court. Said report shall be filed within thirty days after his appointment, unless, for good cause shown, the court shall extend the time. The engineer shall file with his report a statement that he has consulted with the department of health and senior services in connection therewith, and he shall also file with his report any statement in writing which may have been made to him by said department of health and senior services covering the matters contained in such report.
§ 249.040, RSMo