Ohio Rev. Code § 6117.41
At any time after the formation of any county sewer district, the board of county commissioners may enter into a contract, upon the terms and for the period of time that are mutually agreed upon, with any other public agency to prepare all necessary plans and estimates of cost and to acquire or construct any sanitary or drainage facilities or any prevention or replacement facilities that are to be used jointly by the contracting parties, and to provide for the maintenance, operation, and joint use by the contracting parties of those facilities or the maintenance, operation, and joint use of any suitable existing sanitary or drainage facilities or prevention or replacement facilities belonging to either of the contracting parties.
R.C. § 6117.41