Upon receipt of such petition, the department of water resources shall issue a notice, naming the petitioner as contestant and all persons, shown by the records of the department of water resources to have any claim of title or interest in the permit sought to be cancelled as contestees, and requiring all contestees to appear at the office of the department on a day to be specified therein, which day shall be not less than sixty (60) nor more than ninety (90) days from the date of the notice, and show cause, by affidavit, if any there be, why said permit should not be cancelled. Such notice shall be sent by registered mail, addressed to every person named therein at his last known post-office address.
Idaho Code § 42-303