Washington Revised Code Title 58. Boundaries and Plats § 58.17.160. Requirements for each plat or replat filed for record

(1) Contain a statement of approval from the city, town or county licensed road engineer or by a licensed engineer acting on behalf of the city, town or county as to the layout of streets, alleys and other rights-of-way, design of bridges, sewage and water systems, and other structures;

(2) Be accompanied by a complete survey of the section or sections in which the plat or replat is located made to surveying standards adopted by the division of engineering services of the department of natural resources pursuant to RCW 58.24.040.

(3) Be acknowledged by the person filing the plat before the auditor of the county in which the land is located, or any other officer who is authorized by law to take acknowledgment of deeds, and a certificate of said acknowledgment shall be enclosed or annexed to such plat and recorded therewith.

(4) Contain a certification from the proper officer or officers in charge of tax collections that all taxes and delinquent assessments for which the property may be liable as of the date of certification have been duly paid, satisfied or discharged.

No engineer who is connected in any way with the subdividing and platting of the land for which subdivision approval is sought, shall examine and approve such plats on behalf of any city, town or county.