Ohio Rev. Code Ann. § 504.19
(A) The board of township trustees may prepare and adopt a general plan of water supply or sewer services. After the general plan has been approved by the board, the board immediately shall notify the board of county commissioners if territory served by a county water supply facility or a county sewer district includes territory to be covered by the plan, the legislative authority of a municipal corporation that operates a water supply or sewer system in any of the territory to be covered by the plan, and the board of trustees of any existing regional water and sewer district that includes any territory to be covered by the plan, of the township's intention to provide water supply or sewer services and shall describe the area where the township proposes to provide water supply or sewer services. The notified board of county commissioners, legislative authority of a municipal corporation, and board of trustees of the regional water and sewer district then have thirty days from the date of notification to comment and object in writing to the township's provision of water supply or sewer services. An objection may be based on one or more of the following:
(D)
(1) For purposes of this division, either of the following constitutes a public exigency: