The 2.5 million people who drink water provided by the San Francisco Public Utilities Commission are better protected from bugs that cause stomach ailments after the completion of a $114 water treatment facility near Tracy. Water flowing through pipes from Yosemite National Park to the Bay Area, much of which is stored at Hetch Hetchy Reservoir, began passing over a series of ultraviolet lights inside the new Tesla Treatment Facility ......

San Francisco’s health department was criticized during a public hearing and also in a civil grand jury report for the ways it investigates and communicates potential hazards at a redevelopment site in a low-income neighborhood. The department is conducting a review of emails that were obtained using open government laws and released by activists earlier this year. The emails appear to show department officials inviting homebuilder Lennar Corp. to help ......

Carbon monoxide alarms will become nearly as common in California homes as smoke detectors, when new safety rules take effect in two weeks. A state law passed last year requires the devices to be installed in homes or hotel rooms if they have an attached garage, a fireplace or a gas-burning heater or kitchen appliance, such as a stove. The rules will apply to single-family homes beginning July 1 and ......