Versions of Washington Code > Chapter 70A.330 - Petroleum storage tank systems--Pollution liability protection act on LawServer 2023 Washington Code > Chapter 70A.330 – Petroleum storage tank systems–Pollution liability protection act 2022 Washington Code > Chapter 70A.330 – Petroleum storage tank systems—Pollution liability protection act. 2020 Washington Code > Chapter 70A.330 – Petroleum storage tank systems—Pollution liability protection act.