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Treated Wood Waste 

After January 1, 2021 TWW will be treated as hazardous waste and will not be accepted at any landfill site or transfer station in the Sacramento region.  

Effective January 1, 2021, the California Department of Toxic Substances Control will no longer allow landfill disposal of treated wood waste (TWW). State waivers allowed TWW to be handled with Alternative Management Standards (AMS), but these waivers expire on December 31, 2020. This material will now need to be managed as hazardous waste and transported to a Class I hazardous waste landfill for disposal. There is no such disposal site in California.  

The City will no longer accept TTW in its Household Junk Pickup Program. 

TWW is any wood treated with chemical preservatives to protect it from insects or decay and is including but not limited to:

  • Fence posts
  • Sill plates
  • Landscape timbers
  • Pilings
  • Guard rails
  • Decking
  • Patio posts
  • Railroad ties, and more

Local governments are working with hazardous materials companies to find a solution under the new state rules.   Right now, there are no alternative disposal options.  In the meantime, the best option is to keep your treated wood on site.  For more information, visit  Exemptions apply to treated wood waste that has been removed from electric, gas, or telephone service and that meets HSC 25143.1.5 requirements and applies to Kiefer Landfill only.