Treated Wood Hazardous Waste Examples of treated wood include exterior applications where the wood will be in direct contact with soil or water, such as fencing and decking posts. Please schedule a free household hazardous waste drop-off appointment at HHW.org or by calling (408) 299-7300. Available to residents only; must be generated from residence. Separate Treated Wood from other Wood and HHW; no mixed loads are accepted. You can also schedule a free Junk Pickup appointment by contacting your recycling collector. Call 3-1-1. Some City-approved debris box companies will accept loads of treated wood at a different rate than the standard mixed Construction & Demolition box. Residents are advised to call and inquire with the hauler regarding the availability of such service. 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.