Whenever a county or regional plan is adopted by a city planning commission or the board of county commissioners, the fact of such adoption shall be certified by the adopting authority to the regional or county planning commission, as the case may be. Thereupon such regional or county commission shall deposit a copy of so much of the regional or county plan as is affected by such adoption in the office of the county recorder. If such plan shows a recommendation as to the location of a sewage or garbage disposal plant, such deposit shall not be made until six months after the plant’s adoption and when so deposited the copy thereof shall state the action or nonaction of the appropriating authority with respect to the purchase or appropriation of property for such plant, as provided in section 713.25 of the Revised Code.