Ohio Rev. Code Ann. § 6103.04 – Jurisdiction in area incorporated as or annexed to municipal corporation

(A) Whenever any portion of a county sewer district is incorporated as, or annexed to, a municipal corporation, the area so incorporated or annexed shall remain under the jurisdiction of the board of county commissioners for purposes of the acquisition and construction of water supply improvements until all of the improvements for the area for which a resolution described in division (A) or (E) of section 6103.05 of the Revised Code has been adopted by the board have been acquired or completed or until the board has abandoned the improvements. The board, unless and until a conveyance is made to a municipal corporation in accordance with division (B) of this section, shall continue to have jurisdiction in the area so incorporated or annexed with respect to the management, maintenance, and operation of all water supply improvements so acquired or completed, or previously acquired or completed, including the right to establish rules and rates and charges for the use of, and connections to, the improvements. The incorporation or annexation of any part of a district shall not affect the legality or enforceability of any public obligations issued or incurred by the county for purposes of this chapter to provide for the payment of the cost of acquisition, construction, maintenance, or operation of any water supply improvements within the area, or the validity of any assessments levied or to be levied upon properties within the area to provide for the payment of the cost of acquisition, construction, maintenance, or operation of the improvements.
(B) A board may convey, by mutual agreement, to a municipal corporation any completed water supply facilities acquired or constructed by a county under this chapter for the use of, or service of property located in, any county sewer district, or any part of those facilities to which any of the following applies:
1. (1) The facilities are located within the municipal corporation or within any area that is incorporated as, or annexed to, the municipal corporation.
2. (2) The facilities provide water for the municipal corporation or any area that is located within or that is incorporated as, or annexed to, the municipal corporation.
3. (3) The facilities are connected to water supply facilities of the municipal corporation. The conveyance shall be completed with terms and for consideration as may be negotiated. Upon and after the conveyance, the municipal corporation shall manage, maintain, and operate the facilities in accordance with the agreement. The board may retain the right to joint use of all or part of any facilities so conveyed for the benefit of the district. Neither the validity of any assessment levied or to be levied, nor the legality or enforceability of any public obligations issued or incurred, to provide for the payment of the cost of the acquisition, construction, maintenance, or operation of the facilities or any part of them shall be affected by the conveyance.