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PLEASE NOTE:  The TWW Online Notification webpage is currently OFFLINE and is being updated. In the interim, please fill out this form and send it to this email address: tww_help@dtsc.ca.gov .  We apologize for this inconvenience and thank you for your cooperation.

Treated Wood Waste

PLEASE NOTE:  Some areas of the Treated Wood Waste Tracking System are currently OFFLINE and are being updated. If you need to set up a new TWW Tracking System account please email tww_help@dtsc.ca.gov for assistance. If you are receiving an "Error in custom script module" notice then please send an email to tww_help@dtsc.ca.gov with your TWW Tracking System Username only (do not send password)".


What is Treated Wood Waste?

Treated wood waste (TWW) comes from old wood that has been treated with chemical preservatives. These chemicals help protect the wood from insect attack and fungal decay while it's being used. Fence posts, sill plates, landscape timbers, pilings, guardrails, and decking, to name a few, are all examples of chemically treated wood.

Click on the report on the right to read more about how treated wood waste is managed in California.




TWW Cover

Is Treated Wood Waste Toxic?

TWW contains hazardous chemicals that pose a risk to human health and the environment. Arsenic, chromium, copper, creosote, and pentachlorophenol are among the chemicals used to preserve wood and are known to be toxic or carcinogenic. Harmful exposure to these chemicals may result from touching, inhaling or ingesting TWW particulate (e.g., sawdust and smoke).