Guidance for California contractors

Contractors hired by households or businesses in California must adhere to specific requirements in disposing TWW generated during projects. This covers wood waste that may be created in dismantling older structures, such as a deck or outdoor furnishings, as well as scraps and cuttings from new construction using treated wood.

DTSCAll TWW must be disposed in an authorized disposal site and contractors are subject to requirements for storage, labeling, transportation, notifications and recordkeeping. Go to the specific topic under the TWW Basics section for detailed guidance.

Identifying TWWDetermine whether the wood to be removed during projects is treated wood. See guidance
HandlingFollow overall recommendations. See guidance
StorageContractors must follow specific requirements in storing TWW to prevent unauthorized access and minimize run-off. These include blocking and tarping, containerizing, storage buildings, containment pads and other methods. TWW may not be accumulated for more than one year from the date of generation. See guidance
LabelingAll TWW generated, accumulated, stored or transported within California must be clearly marked and visible for inspection. See guidance for sample label.
TransportContractors are considered handlers when transporting TWW from projects and must follow specific requirements for consolidating TWW volumes and providing information that must accompany any shipments for disposal. See guidance
NotificationsContractors are exempt from notification provisions, unless they handle more than 10,000 lbs. of TWW in any calendar year. See guidance
RecordkeepingContractors are required to keep records of TWW disposal, which may take the form of a log, invoice, manifest, bill of lading, shipping document, or receipt from an approved TWW facility. Such records must be maintained for a minimum of three years. See guidance
ReuseTreated wood removed from its current use can only be reused under specific conditions. See guidance
Disposal sitesTWW must be disposed only at authorized disposal sites. Find disposal site