California Health Advisory: Death Cap Mushroom Poisoning Outbreak
Summary
The California Department of Public Health (CDPH) issued an updated health advisory regarding an ongoing outbreak of amatoxin poisoning linked to wild Death Cap mushrooms. As of January 6, 2026, the outbreak has resulted in 35 hospitalizations, three deaths, and three liver transplants across Northern California and the Central Coast.
What changed
The California Department of Public Health (CDPH) has updated its health advisory concerning a severe outbreak of amatoxin poisoning linked to the consumption of wild Death Cap mushrooms. The advisory, initially issued on December 5, now reports 35 hospitalizations, three adult fatalities, and three liver transplants between November 18, 2025, and January 6, 2026. The affected cases span multiple counties in Northern California and the Central Coast, with individuals ranging in age from 19 months to 67 years. CDPH strongly urges Californians to avoid picking and consuming wild mushrooms due to the high risk of misidentification with edible varieties and the potent toxicity of Death Cap mushrooms, which remains even after cooking.
Regulated entities and the public are advised to purchase mushrooms only from trusted sources and to exercise extreme caution. CDPH is actively coordinating with public health partners, providing educational materials in multiple languages, and issuing public service announcements to raise awareness. Individuals who suspect mushroom poisoning should seek immediate medical attention by contacting the California Poison Control System. While this is a public health notice and not a regulatory rule, compliance officers should be aware of the heightened risk and advise consumers accordingly, particularly if their business involves the sale or distribution of mushrooms.
What to do next
- Advise consumers to avoid foraging and consuming wild mushrooms.
- Ensure sourced mushrooms are from trusted vendors.
- Educate staff on the risks associated with wild mushroom consumption.
Source document (simplified)
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Death Cap Mushrooms Linked to Three Deaths, Three Liver Transplants and 35 Hospitalizations
January 14, 2026
NR26-004
Wet Weather Spurs Mushroom Growth and Mushroom Foraging with Fatal Results
What You Need to Know: Recent rain contributed to widespread growth of Death Cap mushrooms in California. CDPH is again urging Californians not to pick or eat wild mushrooms as the risk of potentially deadly amatoxin poisoning is high. Since Death Cap mushrooms are easily confused for safe-to-eat, lookalike mushrooms, all mushroom foraging should be avoided.
As of January 6, 35 cases, including three adult fatalities and three liver transplants, have been linked to the ongoing outbreak.
SACRAMENTO – The California Department of Public Health (CDPH) is issuing an update to its December 5 health advisory as an outbreak of amatoxin poisoning continues across California. This outbreak is linked to the consumption of wild, foraged mushrooms and has caused severe liver damage in both children and adults, resulting in three adult deaths and three liver transplants to date. CDPH urges Californians not to pick or eat wild mushrooms.
Between November 18 and January 6, the California Poison Control System (CPCS) has identified 35 hospitalized cases across Northern California and the Central Coast, spanning regions from Sonoma to San Luis Obispo. Affected individuals range in age from 19 months to 67 years and include family groups and individual cases. Medical treatment for amatoxin poisoning has been provided in the following counties: Alameda, Contra Costa, Monterey, San Francisco, San Luis Obispo, San Mateo, Santa Clara, Santa Cruz and Sonoma. Most cases are in the Monterey and San Francisco Bay Area, though Death Cap mushrooms can be found across the state, particularly adjacent to oaks, other hardwoods and some pines.
Information provided by some affected individuals indicates that Death Cap mushrooms were collected from various locations across Northern California and the Central Coast regions, including, county, city and national park lands.
What CDPH is Doing:
CDPH continues to coordinate with CPCS and public health partners on case investigation, tracking, and developing outreach and education materials. CDPH has released public service announcements (PSAs) in three languages: English, Spanish, and Mixteco (with assistance from the San Luis Obispo Health Agency). These PSAs warn the public about the risks of mushroom foraging, or mushroom hunting, during this high-risk season when Death Cap mushrooms are abundant. Additionally, CDPH has developed poisonous mushroom webpages in English and Spanish; a PDF in Chinese (PDF) that provides important health information; flyers in English, Spanish and Chinese; and, updated outbreak details and additional education resources.
What Californians Can Do:
Avoid picking and eating wild mushrooms during this high-risk season when Death Cap mushrooms are abundant. Death Cap mushrooms are still poisonous even after cooking, boiling, freezing or drying.
Purchase mushrooms from trusted grocery stores and retailers and exercise caution when buying mushrooms from street vendors.
Keep children and pets away from wild mushrooms.
Seek help immediately if you or someone you know has eaten a poisonous mushroom. Contact the CPCS hotline: 1-800-222-1222. Do not wait for symptoms to appear. Treatment is more difficult once symptoms start.
Initial symptoms, such as watery diarrhea, nausea, vomiting, abdominal pain, and dehydration can occur within 6 to 24 hours following ingestion of these toxic mushrooms and usually go away within a day. However, this brief improvement can be deceptive, as patients may still develop serious to fatal liver damage within 48 to 96 hours after eating the mushrooms.
What Public Health Professionals Can Do:
Advise residents to avoid picking and eating wild mushrooms during this high-risk season when Death Cap mushrooms are abundant. Share educational materials on Death Cap mushrooms with your communities.
Assess whether Death Cap mushrooms are blooming in your local area. Regional and local mycological societies such as the North American Mycological Association, may be useful resources.
Work with local partners to reduce exposure by posting advisories in public spaces where these mushrooms may be found, including in county and city parks, and coordinate with veterinarians and animal health services.
For the latest information on wild mushroom related poisonings, please visit California Poison Control System or CDPH Poisonous Wild Mushrooms (go.cdph.ca.gov/PoisonMushrooms) also available in Spanish at CDPH Hongos Silvestres Venenosos (go.cdph.ca.gov/HongosVenenosos).
Resources
PSAs: English PSA (YouTube)
Webpages:
PDF in Chinese that mirrors the content in the above webpages
“Wild Mushrooms: Think Before You Pick” Flow Page with materials in English, Spanish, Mixteco, Chinese, Tagalog, and Vietnamese: https://flow.page/poisonousmushroomsafety
Death Cap mushrooms (Amanita Phalloides) at different stages of development
Page Last Updated : January 14, 2026
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