https://www.siliconvalley.com/2021/05/18/santa-clara-county-mandating-workplaces-to-track-employees-vaccination-status/

Santa Clara County will require employers to determine the vaccination status of their employees starting Wednesday as the state moves away from remote office work, aiming to get ahead of a wider June 15th reopening and potential revisions to workplace rules.

The mandate appears to advance beyond what the state has so far required of employers, though California already allows businesses to use vaccination status to determine whether people may attend certain larger gatherings like sports games, weddings, conferences, concerts or theater shows.