Provides a tiered tax on the possession of hazardous substances to provide for the current program's immediate needs and a more stable source of revenue in the future.

Requires the department of ecology, in consultation with the department of revenue, to provide a report regarding cleanup and stormwater projects and projected hazardous substance tax revenues to the office of financial management and legislative fiscal committees by October 1, 2018, 2020, 2022, and 2024.