Versions of See prior versions of a law on LawServer 2023 Washington Code 70A.300.350 – Local governments to prepare local hazardous waste plans — Basis — Elements required 2022 Washington Code 70A.300.350 – Local governments to prepare local hazardous waste plans–Basis–Elements required 2020 Washington Code 70A.300.350 – Local governments to prepare local hazardous waste plans — Basis — Elements required