Washington Revised Code Title 65. Recording, Registration, and Legal Publication § 65.16.030. Affidavit of publication--Presumption

All legal and other official notices shall be published in a legal newspaper as herein defined, and the affidavit of publication shall state that the newspaper has been approved as a legal newspaper by order of the superior court of the county in which it is published, and shall be prima facie evidence of that fact. Wherever a legal notice, publication, advertisement or other official notice is required to be published by any statute or law of the state of Washington, the proof of such publication shall be the affidavit of the printer, publisher, foreman, principal clerk or business manager of the newspaper which published said notice.