After any project has been completely constructed the commission may at its option convey all the right, title and interest of the district in and to that project to the city in which the project was constructed or county if the project is in an unincorporated area; provided, the governing body of the city or county consents to and accepts the conveyance, and agrees to maintain the project. All projects so conveyed shall be held by the city or county without any further liability or responsibility on the part of the district. No such conveyance shall affect the liability of the district for any bonds previously issued by the district.