No such rates or charges shall be established until after a public hearing at which all the users of the works and the owners of property served or to be served thereby shall have an opportunity to be heard concerning the proposed rates. Notice of such hearing, setting forth the proposed schedule of such rates, shall be given by one publication in a newspaper published in the county wherein the district is located at least ten days before the date fixed in such notice for the hearing. After such hearing the rate shall be passed upon by the board of commissioners and put into effect.