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Psilocybin law in Washington

Decriminalised or deprioritised Checked 26 October 2026

Psilocybin is illegal in Washington: it is a Schedule I controlled substance under RCW 69.50.204, possession is a gross misdemeanor, and the state's 2023 law (SB 5263) only set up a task force and a University of Washington therapy pilot, while several cities and King County have made it a lowest enforcement priority.

Psilocybin is still illegal, but state law reduces the penalty for personal possession, or one or more cities or counties have made it a lowest enforcement priority. Supplying it remains a crime. A summary of published sources, not legal advice.

Source status: Research only. Psilocybin remains a Schedule I drug under US federal law.

Scheduling

Psilocybin and psilocyn are listed as hallucinogenic substances in Schedule I of the Uniform Controlled Substances Act, RCW 69.50.204(c)(28) and (c)(29). [RCW 69.50.204, Schedule I, Washington State Legislature, read 26 October 2026]

What the law says

Local measures

Cities or counties that made psilocybin a low enforcement priority. Possession stays a state crime, and police outside these places are not bound.

Penalties

Bills

  • SB 5201 2025-2026

    Concerning access to psychedelic substances

    Would have legalized supervised adult use of psilocybin under a two-track Department of Health and Liquor and Cannabis Board framework.

    Status: Sent from Health and Long-Term Care without recommendation; no action in Labor and Commerce; reintroduced and retained in committee 12 January 2026, then died when the 2025-2026 biennium ended, 12 January 2026

  • HB 1433 2025-2026

    Concerning access to psychedelic substances

    House companion to SB 5201 legalizing supervised adult psilocybin use.

    Status: Public hearing 5 February 2025; retained in House Health Care and Wellness Committee 12 January 2026, then died when the 2025-2026 biennium ended, 12 January 2026

  • SB 5921 2025-2026

    Concerning psilocybin

    Washington Medical Psilocybin Act: would let licensed clinicians administer psilocybin to qualifying patients 18 and older in medical settings.

    Status: Passed Senate Health and Long-Term Care 3 February 2026; referred to Ways and Means 4 February 2026 and died there, 4 February 2026

Dated changes

  • 4 February 2026: Washington Medical Psilocybin Act: would let licensed clinicians administer psilocybin to qualifying patients 18 and older in medical settings. Status: Passed Senate Health and Long-Term Care 3 February 2026; referred to Ways and Means 4 February 2026 and died there. Source
  • 12 January 2026: Would have legalized supervised adult use of psilocybin under a two-track Department of Health and Liquor and Cannabis Board framework. Status: Sent from Health and Long-Term Care without recommendation; no action in Labor and Commerce; reintroduced and retained in committee 12 January 2026, then died when the 2025-2026 biennium ended. Source
  • 12 January 2026: House companion to SB 5201 legalizing supervised adult psilocybin use. Status: Public hearing 5 February 2025; retained in House Health Care and Wellness Committee 12 January 2026, then died when the 2025-2026 biennium ended. Source

The full law map, with 51 US entries and every country we cover, or every dated change.