Washington Revised Code Title 70A. Environmental Health and Safety § 70A.455.130. Labeling a product “home compostable”--Requirements

(1) The product has been tested and meets ASTM standards D6400 or D6868 for industrial composting settings;

(2) A third-party certifier has verified that the product meets ASTM standards for industrial composting;

(3) The product is otherwise labeled in a manner consistent with the requirements of this chapter, including RCW 70A.455.030, 70A.455.040, or 70A.455.050, as appropriate;

(4) The product is not labeled “home compostable only” or in a manner that otherwise implies that the product is not capable of being composted in industrial compost settings; and

(5) The producer has valid and reproducible scientific evidence to support their claim that a product is home compostable, consistent with federal trade commission guidelines.