1. In any county having not less than five hundred thousand and not more than seven hundred thousand inhabitants, in any county which adjoins or which contains a portion of a city having more than four hundred thousand inhabitants, and in any county of the first class not having a charter form of government, whenever a petition signed by ten percent of the voters of the proposed district is filed with the county clerk of any such county, or whenever such county commission deems the construction of sewers necessary for sanitary or other purposes, such county commission after consultation with the sewer engineer shall adopt a resolution to establish such sewer district or districts. The resolution shall describe generally the size and location of the proposed sewer district or districts.

2. In any county of classes two, three or four which are not subject to subsection 1, the county commission of the county, upon the filing of a petition signed by ten percent of the voters of the proposed district, shall, after consultation with the sewer engineer, adopt a resolution to establish the sewer district. The resolution shall describe generally the size and location of the proposed sewer district.

3. Any sewer district created by resolution of the county commission in accordance with this section shall be a body corporate and a political subdivision of the state of Missouri, shall be capable of suing and being sued in contract in its corporate name, and shall be capable of holding such real and personal property necessary for corporate purposes. The county commission shall serve as the governing body of any sewer district created in accordance with this section.