Treated Wood

Illegal in Garbage & Drains
Hazardous Waste Special Instructions Take to Landfill

Treated Wood Waste (TWW) is now accepted at the following local disposal sites:

As of January 1, 2021, California’s rules regarding treated wood waste were changed and are now subject to the full set of hazardous waste regulations, which includes disposal in a Class 1 hazardous waste landfill. 

Note: The Department of Toxic Substances Control (DTSC) has indicated that the sunset of the statute and repeal of the alternative management standards for treated wood waste will significantly impact the management of treated wood waste, imposing significant additional regulatory requirements on treated wood waste which have not been required for many years. Thus DTSC intends to issue temporary variances to allow treated wood waste to continue to be managed pursuant to the alternative management standards and disposed of in composite-lined landfills.  Landfills that wish to accept treated wood waste will be required to apply for and fund a variance with DTSC.

Management of Treated Wood Waste in California

Treated Wood Waste Frequently Asked Questions

More questions? Call Rizgar Ghazi, Acting Deputy Director DTSC
Phone: 916-825-3078 Email: 
[email protected]


Never Burn Treated Wood

Chemicals such as creosote are used when treating wood, which creates toxic ash and emissions when burned. These particles lodge in soil and groundwater and take many years to break down, so never burn wood if you think it has been treated.


Take Care With Sawdust

Avoid breathing in sawdust from treated wood, and do not add it to compost or scatter on the ground.

Ways to Reduce


Choose a Different Wood

Redwood and cedar are both naturally pest-resistant. Suppliers are also starting to offer more non-toxic treated wood options.

Ways to Reuse


Repurpose for New Project

Certain types of wood products can be reused in a variety of ways. Find out how to repurpose your wood product.