Kan. Stat. § 19-27a24
Upon petition of the governing body of any city, the board of county commissioners of any county may attach territory lying within and served by the sewer system of the city to an existing county sewer district. Prior to attaching the territory to a county sewer district, the board of county commissioners shall give notice of its intent to do so and of a public hearing to be held thereon. Notice of the hearing shall be given in the manner provided by K.S.A. 19-27a05. After the hearing, if the board finds that it would be in the best interest of the persons residing within the territories affected by the transfer, the board may adopt a resolution providing for the attachment of the territory to the county sewer district. All bonds issued or other indebtedness incurred by the county or the city prior to the attachment of the territory shall remain the liability of and lien against the properties to which the liability attached prior to the inclusion of the territory in the county sewer district. If the board of county commissioners determines that property in either the city sewer system or the county sewer district will benefit from the use of sewer facilities constructed by the other governmental unit, notice of the determination shall be given along with the notice of the public hearing. After the determination, the board of county commissioners may levy and collect an annual charge against the property benefited, which shall be used only for the purpose of helping to pay the principal of and interest on the bonds issued by the other governmental unit for the purpose of constructing the sewer facilities being utilized. The cost of any further enlargements or improvements of the county sewer district shall be paid by sale of general obligation bonds of the county as provided by the general bond law and shall be assessed against all of the properties included in the county sewer district at the time of the issuance thereof.
K.S.A. 19-27a24