Is HHC Legal in Washington?
May 22, 2026
Is HHC legal in Washington? No. WSLCB Policy Statement #PS21-01 and SB 5367 (2023) treat chemically converted HHC as a prohibited synthetic cannabinoid.
Is HHC legal in Washington? No. WSLCB Policy Statement #PS21-01 and SB 5367 (2023) treat chemically converted HHC as a prohibited synthetic cannabinoid.
Last reviewed: May 22, 2026
No. Washington does not permit hexahydrocannabinol (HHC) at any retail tier. HHC is produced almost exclusively by hydrogenation of hemp-derived CBD or delta-9 THC, which is a chemical conversion process. WSLCB Policy Statement #PS21-01 (April 28, 2021) treats chemically synthesized THC isomers and their analogs as Schedule I controlled substances under RCW 69.50.204, and SB 5367 (2023) bars retail sale of any product with detectable THC outside the WSLCB licensed cannabis system.
The Washington State Liquor and Cannabis Board (WSLCB) regulates licensed cannabis under RCW Chapter 69.50, the state's Uniform Controlled Substances Act, and Initiative 502 (2012). The Washington State Department of Agriculture (WSDA) administers hemp cultivation under RCW Chapter 15.140 (the Washington Hemp Production Act). Adults 21 and over may possess up to 1 ounce of useable cannabis under RCW 69.50.360.
HHC appeared at U.S. hemp retail around 2021 as manufacturers expanded the synthetic-cannabinoid product line beyond delta-8 and delta-10. WSLCB had already issued Policy Statement #PS21-01 in April 2021 covering "synthetically derived THC compounds," and Cannabis Bulletin 21-03 (September 2021) extended the prohibition to licensed cannabis processors and retailers. WSLCB's position on HHC has been consistent: chemically converted cannabinoids fall outside the lawful hemp framework and outside the licensed cannabis channel.
RCW 69.50.204 lists tetrahydrocannabinols and their synthetic equivalents in Schedule I. HHC is structurally similar to delta-9 THC but fully saturated through hydrogenation. WSLCB reads the statute and PS21-01 to include hydrogenated cannabinoid analogs produced by chemical conversion. Commercial HHC is not produced by direct plant extraction and so falls into the prohibited category.
SB 5367 (2023) reinforces the prohibition at the retail tier. The bill amended RCW 69.50 to define "cannabis product" to include any product with detectable THC and removed delta-9-only language from "THC concentration." HHC contains a tetrahydrocannabinol structure for purposes of Washington's broadened definition, and any HHC product therefore lands in the cannabis product category. Because WSLCB licensees may not manufacture or stock synthetic cannabinoids, no retail path exists for HHC in Washington.
WSDA hemp licensees may not produce HHC because the production process is hydrogenation rather than extraction. The 2018 federal Farm Bill defense that some marketers cite is not recognized by WSLCB for hydrogenated cannabinoid analogs.
WSLCB and local enforcement have pulled HHC vapes, gummies, and disposables from smoke shops, gas stations, and CBD stores since 2022. Joint inspections with local code enforcement and the state Attorney General's office have been the typical tool. Stop-sale orders, civil enforcement, and referral for criminal prosecution under RCW 69.50 follow repeated violations. Licensed cannabis processors caught manufacturing HHC have faced license revocation.
You cannot legally buy HHC products in Washington. WSLCB-licensed cannabis retailers may not stock them, and unlicensed hemp retailers may not sell any product with detectable THC. Out-of-state online retailers that ship HHC to Washington addresses are violating SB 5367 and may be intercepted. HHC metabolites can produce positive results on standard drug tests that detect delta-9 metabolites because of structural similarity.
The federal hemp redefinition in H.R. 5371 §781, signed November 12, 2025 and effective November 12, 2026, explicitly excludes synthetic and chemically converted cannabinoids from the federal hemp definition. HHC is one of the canonical products the federal exclusion targets. After November 12, 2026, HHC loses any remaining federal Farm Bill argument nationwide, which aligns federal law with Washington's WSLCB position. For comparison with how Washington treats THCA, see our Washington THCA page.
Is HHC legal in Washington in 2026? No. WSLCB Policy Statement #PS21-01 (2021) treats chemically synthesized cannabinoids including HHC as Schedule I controlled substances, and SB 5367 (2023) bars retail sale of any product with detectable THC outside the WSLCB system. Licensed retailers may not stock HHC either.
What is HHC and how is it produced? HHC is hexahydrocannabinol, a hydrogenated form of THC. Commercial HHC is produced by adding hydrogen to hemp-derived CBD or delta-9 in the presence of a catalyst. It is not a direct plant extraction.
Can I buy HHC at a Washington licensed cannabis store? No. WSLCB Bulletin 21-03 prohibits licensed processors from manufacturing synthetic cannabinoids and licensed retailers from selling them.
Does HHC show up on a drug test? HHC metabolites overlap with delta-9 metabolites on most standard urine, saliva, and hair screens. Specialty panels can distinguish them but are uncommon in routine testing.
Can I order HHC online to a Washington address? Out-of-state shipments of HHC to Washington addresses violate state law and may be intercepted by WSLCB or local enforcement.
What changes for HHC nationally on November 12, 2026? The federal hemp redefinition in H.R. 5371 §781 explicitly excludes synthetic and chemically converted cannabinoids from the federal hemp definition. HHC loses federal Farm Bill protection on that date.
How does Washington compare to other states on HHC? Washington has prohibited HHC since 2021 under PS21-01 and reinforced the position with SB 5367 in 2023. See our 2025 hemp regulation roundup for state-by-state comparisons.
This page is provided for informational purposes by ComplyAssistAI LLC and is not legal advice. Hemp and cannabis law in Washington changes frequently. For business compliance questions, consult a Washington-licensed cannabis attorney. Find one in our Cannabis Lawyer Directory.
Illegal
Washington SB 5367 (2023); WSLCB Policy Statement #PS21-01 (2021); RCW Chapter 69.50; RCW 69.50.204
Hexahydrocannabinol (HHC) is produced by hydrogenation of hemp-derived cannabinoids and is treated as a synthetic/chemically converted cannabinoid. WSLCB prohibits HHC at all retail tiers; licensed processors may not manufacture it and retailers may not sell it.
Yes
