RCW 70A.455.030: Use of terms on label.

(1) Except as provided in this chapter, no producer may sell, offer for sale, or distribute for use in this state a plastic product that is labeled with the term "biodegradable," "degradable," "decomposable," "oxo-degradable," or any similar form of those terms, or in any way imply that the plastic product will break down, fragment, biodegrade, or decompose in a landfill or other environment.

(2) This section does not apply to biodegradable mulch film that meets the required testing and has the appropriate third-party certifications.