California Sees Surge in Poisonous Mushroom Cases Amid Wet Weather
California Sees Surge in Poisonous Mushroom Cases Amid Wet Weather
US · Published May 30, 2026
California is experiencing a significant increase in poisonings linked to wild mushrooms, with 50 cases reported since November 2025, according to the California Department of Public Health.
This marks a sharp rise compared to previous years, with the last major outbreak in 2016 reporting only 14 cases.
The surge is attributed to an exceptionally wet winter followed by April rains, which have created ideal conditions for the growth of toxic mushrooms such as the death cap (Amanita phalloides) and the western destroying angel (Amanita ocreata).

Why It's Important?

The rise in mushroom poisonings poses a serious health risk, particularly in areas where these toxic species are proliferating. The death cap, considered the world's most poisonous mushroom, accounts for 90% of mushroom-related fatalities globally. In California, the death cap, western destroying angel, and deadly galerina are the primary culprits. Symptoms of poisoning can include severe gastrointestinal distress, liver failure, and in some cases, death. Vulnerable populations, including children and those with pre-existing health conditions, are at heightened risk. The recent cases have led to hospitalizations, liver transplants, and fatalities, underscoring the severity of the issue.

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