June 27, 2025 CSLB #25-03
Sacramento, CA – The Contractors State License Board has an important reminder for contractors working with treated wood.
On behalf of the treated wood industry, the Western Wood Preservers Institute (WWPI) has geared outreach efforts toward California residents, businesses, contractors, landfills, transfer stations and waste haulers who are involved in treated wood waste (TWW) disposal. AB 332, which passed in 2021, required the wood preserving industry to work with state regulators to conduct educational outreach efforts on the handling and disposal requirements.
In spring 2022, WWPI launched the TWWDisposal.org website to provide key information on disposal, including links to landfills authorized to accept treated wood waste. Thousands have accessed the site to learn how to identify treated wood waste and understand the requirements for handling, storage, labeling and transportation of treated wood waste. To enhance understanding of the regulations, the website is available in both English and Spanish-language versions. The website also includes guidance for contractors who may be generating or disposing treated wood waste.
CSLB is distributing this message pursuant to subdivision (e) of Health and Safety Code Section 25230.15. Please refer to the Department of Toxic Substances Control website for information on treated wood waste or to the Western Wood Preservers Institute for more information about this message or about treated wood waste in California.
Please note: the information is being provided by CSLB "as is" without warranty of any kind, express or implied. CSLB does not warrant, affirm, or offer any representations as to the accuracy, content, completeness, legality or reliability of the information contained in the outreach materials.
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