Psilocybin Laws in Washington
Washington state decriminalized personal possession of small amounts of psilocybin and other psychedelics in 2023, making it one of the first states to act at the statewide level. Seattle had previously passed a lowest-priority enforcement resolution in 2021.
Current Legal Status
Decriminalized — Statewide Personal Use
Personal possession of up to 40 grams of psilocybin mushrooms (or 4 grams of psilocybin extract) is a civil violation, not a criminal offense, under Washington state law. Cultivation, distribution, and commercial activity remain illegal. A therapeutic access bill is also advancing.
Key Legislation
SB 5263 (2023) — decriminalized personal possession of psilocybin and other natural psychedelics for adults, replacing criminal penalties with civil fines and referral to assessment. Seattle City Council resolution (2021) — prior lowest-priority enforcement directive. HB 1493 (2025) proposes a licensed therapeutic program; in House committee.
Decriminalization
Washington state law (SB 5263, 2023) decriminalized personal possession of up to 40 grams of psilocybin mushrooms for adults. Civil fine only — no criminal record. Possession above the threshold or distribution remains a criminal offense.
Clinical Trials
University of Washington has broad research programs. Check ClinicalTrials.gov for Seattle-area enrolling psilocybin studies.
Advocacy Organizations
Decriminalize Nature Washington, Washington Psychedelic Society, Healing Advocacy Fund.
Related Resources
Directory in Washington
- Pacific Northwest Psychedelic Training Center — Psychedelic Therapy Training
View all Washington directory listings →
People in Washington
- Kody Zalewski — Executive Committee, Decriminalize Nature Seattle; Co-Director, PMAW; Policy Analyst, Calyx Law; UW Medical Researcher
- Tatiana Luz Quintana — Co-leader, DNS; Co-Director, PMAW; Founder, The Zome
- Ekaterina Henyan — Lead, Psychedelic Medicine Alliance of Washington (PMAW)
- Taylor E. Loyden, Esq. — Managing Attorney, Terrapin Legal PLLC
- Paul Stamets — Mycologist; Founder, Fungi Perfecti
Societies & Organizations in Washington
- Psychedelic Medicine Alliance of Washington (PMAW) — Policy Advocacy + Community Org
- The Zome — Community Discussion Group
- Decriminalize Nature Seattle (DNS) — Decriminalization Org
- REACH (Responsible Entheogen Access & Community Healing Coalition) — State Policy Coalition
- Psychedelic Society of the Pacific Northwest — Community Society
See how Washington compares to neighboring states and find therapy options for residents: