{"brand":"Compound Laws","url":"https://compoundlaws.com/compounds/thca/washington/","compound":{"slug":"thca","name":"THCa","same_as":"https://en.wikipedia.org/wiki/Tetrahydrocannabinolic_acid"},"jurisdiction":{"code":"WA","name":"Washington"},"as_of":"2026-10-19","answer":"As of October 19, 2026, THCa is legal to sell at retail in Washington. delta-9-only basis - THCa flower passes definition. Controlling source: RCW 15.140.020 (Hemp) - delta-9-only definition; SB 5367 hemp-vs-cannabis line for intoxicating cannabinoids.","forms":[{"form":"all","label":"All forms","status":"legal","state_status":null,"federal_overlay":false,"headline":"delta-9-only basis - THCa flower passes definition","rule_type":"permanent","tier":"unscheduled","schedule_class":null,"limit":null,"effective_date":null,"verified_at":"2026-10-19","confidence":"under_review","verbatim_excerpt":"'Hemp' means the plant Cannabis sativa L. ... with a delta-9 tetrahydrocannabinol concentration of not more than 0.3 percent on a dry weight basis. (RCW 15.140.020(7))","excerpt_source_url":"https://app.leg.wa.gov/RCW/default.aspx?cite=15.140.020","citations":[{"title":"RCW 15.140.020 (Hemp) - delta-9-only definition; SB 5367 hemp-vs-cannabis line for intoxicating cannabinoids","url":"https://app.leg.wa.gov/RCW/default.aspx?cite=15.140.020","pinpoint":null,"publisher":"Washington State Legislature","type":"gov","primary":true,"official":true}],"history":[]}],"neighbors":[{"code":"ID","status":"illegal"},{"code":"OR","status":"illegal"}],"laws":[{"citation":"RCW 15.140.020","title":"Definitions -- Hemp (delta-9-only); Hemp consumable (includes inhalation)","official_url":"https://app.leg.wa.gov/RCW/default.aspx?cite=15.140.020","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-07-02","text_hash":"8f2ff536faa0aba7df25addbeac7a2808725de47a7bd1fed5886453ea57e8a87"},{"citation":"RCW 69.50.101(4), (8)(a), (49); RCW 15.140.020 (SB 5367, 2023)","title":"RCW 69.50.101(4), (8)(a), (49); RCW 15.140.020 (SB 5367, 2023)","official_url":"https://app.leg.wa.gov/RCW/default.aspx?cite=69.50.101","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-10-07","text_hash":"f3042f0e75f2f10b80d825a815fff884984d625c8fb005d079be501632fe1f8d"},{"citation":"RCW 69.50.575","title":"69.50.575. Cannabis health and beauty aids.","official_url":"https://app.leg.wa.gov/rcw/default.aspx?cite=69.50.575","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-07-18","text_hash":"ddf002e2f91de129eddb77f22035f58095847d82ebb7f75d4e4619d515a313af"},{"citation":"RCW 69.50.575 (Cannabis health and beauty aids); RCW 69.50.101(8)(a) (cannabis product definition -- detectable-THC trigger)","title":"Cannabis product definition","official_url":"https://app.leg.wa.gov/rcw/default.aspx?cite=69.50.575","source_label":"OFFICIAL","effective_date":null,"retrieved_date":"2026-10-07","text_hash":"03e1ee28695e3aabc4c4fc835fb58f3932c762296d58a6c2012f96aeb491f282"}]}