Fifty or more legal voters of a proposed sanitary sewer or water district, may petition the county government to submit the question of organizing a sanitary sewer or water district to a vote of electors in that district. The petition shall contain a description of the proposed district and shall be accompanied by a map drawn to scale showing the boundaries of the proposed district together with the limits of any incorporated areas which may be included in the district. The execution of the petition by an elector shall be acknowledged by that elector or it may be proved by the oath of a witness who shall swear that the witness knows the elector and that the petition was signed by the elector in the presence of the witness.