Washington’s THC definition is statutory and includes THCA.
Is THCA Legal in Washington?
Washington’s THC definition is statutory and includes THCA. The controlling authority is RCW 69.50.101 and E2SSB 5367 (2023), and the measurement standard Washington applies is ‘the combined percent of tetrahydrocannabinol and tetrahydrocannabinolic acid’.
That standard decides everything. Where a state measures total THC, delta-9 plus 87.7% of the THCA content, high-THCA material fails on the same lab result that passes federally. Run any Certificate of Analysis through the total THC calculator to see both numbers.
What Happened in Washington
The definition is written directly into statute rather than agency rule, which makes it unusually settled. Any product with detectable THC routes to WSLCB-licensed cannabis retailers.
What This Means for Buyers in Washington
Licensed cannabis retail only.
Washington THCA Questions
Why is THCA not permitted in Washington?
Because Washington measures ‘the combined percent of tetrahydrocannabinol and tetrahydrocannabinolic acid’ rather than delta-9 alone, under RCW 69.50.101 and E2SSB 5367 (2023). High-THCA material fails that test by definition.
Is any hemp product still legal in Washington?
Licensed cannabis retail only.
Does federal legality override this?
No. Federal law is a floor, not a ceiling — appellate courts have repeatedly upheld stricter state standards.