Wash. Rev. Code § 70A.220.020
Except as provided in RCW 70A.220.030(2), after January 1, 1992, no person may distribute, sell, or offer for sale in this state a plastic bottle or rigid plastic container unless the container is labeled with a code identifying the appropriate resin type used to produce the structure of the container. The numbers and letters used shall be as follows:
[ 2021 c 313 s 18; 2020 c 20 s 1228; 1991 c 319 s 104. Formerly RCW 70.95F.020.]
Finding—Intent—2021 c 313: See note following RCW 70A.245.010.