Treated Wood

Illegal in Garbage & Drains
Special Instructions

WHAT IS TREATED WOOD?  Wood treated with a chemical preservative for protection against pests and environmental conditions. Once treated, it cannot be recycled nor placed in the trash because it is considered a hazardous waste. (Note: untreated wood free of paint or stain is recyclable but not allowed in your bin or cart).

When preservative-treated wood has reached the end of its service life it needs to be  properly disposed, the chemicals it contains can leach out of the wood and contaminate surface water and groundwater. This can pose a potential risk to human health and the environment. (source: California Department of Toxic Substances Control)

While treated wood is considered a hazardous waste, it can only be taken to an approved landfill facility permitted to handle this material, not a hazardous waste collection center.  Call first to confirm and to determine drop off fees.

Learn more about treated wood:  

Treated Wood Waste (TWW)



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.