Ohio Rev. Code § 6112.05
A board of county commissioners may acquire, by purchase, sewerage systems and disposal systems serving sewer districts within its county, constructed by any person under the authority granted by sections 6112.02 and 6112.03 of the Revised Code. If the board and owners thereof are unable to agree upon its purchase and sale, or the amount of compensation therefor, the board may appropriate the sewerage system and disposal system. To carry out the appropriation of the sewerage system and disposal system, the board shall proceed in the same manner as is provided by law for the appropriation of private property by a municipal corporation at the time such appropriation is made. The board shall perform all duties required to be performed by the mayor or legislative authority of a municipal corporation by such laws, and the passage of equivalent resolutions by such board shall fulfill the requirements of such laws as to resolutions and ordinances to be passed by the legislative authority of a municipal corporation.
R.C. § 6112.05