Guidance for landfills accepting TWW

Only landfills authorized by the state of California are allowed to accept TWW for disposal. The California State Water Resources Control Board maintains a list of landfills and disposal facilities that are authorized to accept TWW.

DTSCUnder the Alternative Management Standards for disposing of TWW, landfill have specific responsibilities in recordkeeping and notifications. See below for these requirements:

Notifications/ReportingDisposal facilities need to obtain and keep specific information about each generator disposing treated wood waste. Once a generator has exceeded disposing more than 10,000 lbs. of preservative TWW, the disposal facility will need to input the generators information into the Treated Wood Waste Tracking System. Contact the state DTSC to establish an account for a landfill.

Disposal facilities must keep records documenting the disposal, as required by the state Department of Toxic Substances Control (DTSC). Records may take the form of a log, invoice, manifest, bill of lading, shipping document, or receipt to a generator from an approved TWW facility.

Records must be kept for a minimum of three years. For approved landfills, the period starts when they receive the TWW.

Keep records for the following activities:

Shipments Received by Approved Facilities – Records of TWW received by an approved facility must include:

  • Name, phone number, mailing address and email address of the generator.
  • Physical address of where the TWW originated.
  • Weight of TWW or the estimated weight of TWW. Any estimation shall be noted in the record.
  • Date theTWW was received by the approved facility.

Reporting Shipments of TWW to the Department of Toxic Substances Control (DTSC) – Each year a facility receives TWW, the facility shall submit a semi-annual report to DTSC for the following periods: January 1 to June 30 and July 1 to December 31. Reports must be submitted 30 days after each reporting period through the Treated Wood Waste Tracking System. Each report must include the following information:

  • The TWW facility name, address of facility site, contact person, telephone number email address and identification number.
  • Weight summary of all TWW quantities received by households.
  • Weight summary of all TWW quantities discovered and separated from solid waste as part of an on-site load check.
  • Shipments of TWW received from another TWW facility. This should include: the identification number or name of the facility shipping TWW, address, contact person, mailing address, email address, telephone number, dates of shipments and the weight of TWW per shipment.
  • Reports of TWW shipments received that do not fit into the list above must include: generator’s identification number (if the generator does not have an identification number, their name, address, contact person, mailing address, email address and telephone number is required), date of shipments and the weight of TWW per shipment.
ProhibitionsReview general prohibitions for TWW that apply to disposal facilities. See guidance

Guidance – Landfills

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