The notice shall be headed “Notice of the formation of __________ County Waterworks District No. __________” (stating name of county in which the district is located and the number of the proposed district) in letters not less than one inch in length, and shall, in legible characters, state the fact and date of the filing of the petition, the date and hour set for hearing the petition and any protests, briefly describe the proposed improvement, specify the exterior boundaries of the district to be benefited by the improvement and to be taxed to provide for the improvement, and refer to the petition, map, and general description of the proposed improvement for further particulars.