(Effective August 18, 2026)
(1) In order to be transported into Washington state, firewood from outside Washington state must be heat treated to a minimum wood core temperature of 71°C (160°F) for at least 60 minutes or equivalent treatment as approved by the department. Air drying of firewood is insufficient and is not approved by the department. Post treatment firewood must be stored in a manner to minimize potential reinfestation by plant and bee pests.
(2) Firewood that meets the standard in subsection (1) of this section may be transported into Washington state if accompanied by a label that fully states:
(a) The source of the firewood; and
(b) Includes the statement "Approved Pest Free."
(3) Providers of "Approved Pest Free" firewood shall maintain, for at least two years from the date of treatment, records that document the source of the wood, the treatment method, date of treatment, and the volume of firewood treated. When requested, providers of "Approved Pest Free" firewood shall provide such records to the department at no cost. Official phytosanitary certificates from a firewood provider's state department of agriculture or official equivalent may be used to verify the treatment method and volumes of treated firewood produced.
(4) Packaged firewood that has been certified by USDA may also be transported into Washington state. This firewood must be labeled to clearly show it is certified by USDA, as well as contain the producer's name and address.