Treated Wood Waste Accepted At Hawthorne Street Transfer Station Beginning July 1st

Effective Thursday, July 1st and until further notice, HWMA is pleased to announce we were granted a 6-month variance waiver from the Department of Toxic Substance Control (DTSC) to allow the acceptance of Treated Wood Waste (TWW) at the Hawthorne Street Transfer Station’s Tip Floor.  This waiver comes after DTSC banned the disposal of TWW at California landfills on January 1, 2021.

This waiver allows HWMA to accept and dispose of TWW to permissible landfills with proper lining and environmental controls.  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.

DTSC requires that in order to transport hazardous waste, such as TWW, persons must either be a registered hazardous waste transporter or have received a variance from DTSC.  Further information on obtaining a variance can be found at  This excludes homeowners who self-deliver less than 50 pounds of TWW.

Please review the following TWW guidelines prior to visiting HWMA’s Transfer Station:

  • TWW loads must be pre-sorted from other materials prior to arrival at the Transfer Station.
  • Customers must unload TWW by hand into designated receiving area.
  • Homeowners self-delivering less than 50 pounds of TWW are not required to have a transportation variance.
  • Homeowners self-delivering greater than 50 pounds of TWW are required to have a transportation variance issued by DTSC.
  • Small Quantity Generators who generate up to 10,000 pounds per calendar year are required to secure a Small Quantity Generator Variance. This variance allows the holder to accumulate and transport their own TWW in a manner consistent with the previously approved alternative management standards.  DTSC expects this type of variance to apply to small businesses that generate limited quantities of TWW. Transporters and Haulers will be required to complete the Waste Manifest Profile.
  • HWMA is required to track the weights for TWW coming into our facility per DTSC guidelines and report the generator information.
  • TWW will be charged the standard tip fee of $155.82/ton plus a $10 service fee.

HWMA appreciates our customers having been compliant with DTSC’s changes affecting TWW disposal over the past several months, and we ask for your continued patience and understanding as we navigate these new regulations.

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