An analysis of millions of California pregnancies reveals a sharp rise in prenatal opioid use over the past decade, with newborns increasingly born into withdrawal and requiring intensive medical care. The surge is fueling calls for expanded maternal treatment programs.

Berkeley faces a leptospirosis outbreak among pets and rats at a local homeless encampment, posing health risks to residents. Officials urge relocation and cautionary measures.

The EPA says it will propose a federal limit for perchlorate in tap water after a court order. The agency argues few systems are affected, but testing and public comment will follow.

Contra Costa Health says a confirmed measles case may have exposed shoppers at multiple Walnut Creek stores and the Kaiser emergency department; unvaccinated people should check their status.

Lucky Foods cinnamon powder has been recalled after tests found elevated lead. Small 40g brown‑label pouches sold in California and 13 other states are affected.

State health officials say TRE House magic mushroom gummies, bars and syrup tested positive for illegal psychedelic compounds and should not be eaten.

A UCSF secret‑shopper study found Bay Area budtenders often recommend topicals for pain and edibles for sleep — despite limited clinical evidence. Researchers say more research and training are needed.

Invasive Aedes aegypti mosquitoes found in Dublin, prompting local authorities to inspect and treat potential breeding sites to prevent diseases like Zika and dengue.

Invasive Aedes aegypti mosquitoes found in Livermore prompt the Alameda County Mosquito Abatement District to urge residents to eliminate standing water.

Kaiser Permanente healthcare workers in Northern California strike for better patient care and working conditions.

A second crow tested positive for West Nile virus in Walnut Creek, with increased mosquito breeding and WNV risk due to hot weather. Residents are urged to eliminate standing water and use repellent.

Contra Costa County confirms its first 2025 avian West Nile virus case in a California scrub jay, prompting community engagement and preventive measures.

Santa Clara County officials warn of measles exposure at local establishments and remind residents to check vaccination status and seek medical advice if exposed.