Jurisdiction of parties; service of summons and petition. (1) Jurisdiction of all interested parties may be had by the publication of summons in the manner provided by ORCP 7. Copies of the summons and the petition of the district shall be mailed to each qualified elector and landowner at the mailing address as shown by the records of the county clerk, the county tax collector and the county assessor, and to all known creditors of the district

ORS 548.940 — under Chapter 548.