Ohio Rev. Code § 729.52
The funds received from the collection of sewer rentals under section 729.49 of the Revised Code shall be deposited weekly with the treasurer of the municipal corporation. Money so deposited shall be kept as a separate and distinct fund and shall be known as the sewer fund. When appropriated by the legislative authority of the municipal corporation, the fund shall be subject to the order of the director of public service of a city or of the board of trustees of public affairs of a village. The director or board shall sign all orders drawn on the treasurer of the municipal corporation against such fund, which fund shall be used for the payment of the cost of the management, maintenance, operation, and repair of the sewerage system and sewage pumping, treatment, and disposal works. Any surplus in such fund may be used for the enlargement or replacement of the system and works, for construction and reconstruction of main and interceptor storm sewers, for the payment of the interest on any debt incurred for the construction thereof, and for the creation of a sinking fund for the payment of such debt, but shall not be used for the extension of a sewerage system to serve unsewered areas or for any other purpose; provided, where such municipal corporation does not operate or maintain a sewage pumping, treatment, and disposal works, any or all of such surplus may be transferred to the general fund of the municipal corporation in the manner provided in sections 5705.15 and 5705.16 of the Revised Code.
R.C. §729.52