RCW 60.28.015

Every person, firm, or corporation furnishing materials, supplies, or equipment to be used in the construction, performance, carrying on, prosecution, or doing of any work for the state, or any county, city, town, district, municipality, or other public body, shall give to the contractor of the work a notice in writing, which notice shall cover the material, supplies, or equipment furnished or leased during the sixty days preceding the giving of such notice as well as all subsequent materials, supplies, or equipment furnished or leased, stating in substance and effect that such person, firm, or corporation is and/or has furnished materials and supplies, or equipment for use thereon, with the name of the subcontractor ordering the same, and that a lien against the retained percentage may be claimed for all materials and supplies, or equipment furnished by such person, firm, or corporation for use thereon, which notice shall be given by (1) mailing the same by registered or certified mail in an envelope addressed to the contractor, or (2) by serving the same personally upon the contractor or the contractor's representative and obtaining evidence of such service in the form of a receipt or other acknowledgment signed by the contractor or the contractor's representative, and no suit or action shall be maintained in any court against the retained percentage to recover for such material, supplies, or equipment or any part thereof unless the provisions of this section have been complied with.