Ohio Rev. Code Ann. § 6119.02
(A) Proceedings for the organization of a regional water and sewer district shall be initiated only by a petition filed in the office of the clerk of the court of common pleas of one of the counties all or part of which lies within the proposed district. The petition shall be signed by one or more municipal corporations, one or more counties, or one or more townships, or by any combination of them, after having been authorized by the legislative authority of the political subdivision. The legislative authority of any municipal corporation, the board of county commissioners of any county, and the board of trustees of any township may act in behalf of any part of their respective political subdivisions. The petition shall specify all of the following: