Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 539.015

Each claimant or owner who files a statement and proof of claim form or a registration statement shall be required to certify to the statements of the claimant or owner under oath. The Water Resources Director or the authorized assistant of the director may administer such oaths, which shall be done without charge, as also shall be the furnishing of blank forms for the statement.