https://www.mercurynews.com/2021/07/19/californias-delta-covid-surge-would-vault-a-dozen-or-more-counties-to-widespread-purple-tier/

How bad is California’s Delta COVID-19 surge? If California was still using its four-color reopening blueprint for ranking counties by infection rates, at least a dozen, including Los Angeles, Alameda, Contra Costa and Solano now would be in the most restrictive purple tier and many businesses would not be fully open.

And that’s using new metrics the state introduced in March that made it easier for counties with higher case rates to move into lower-restriction tiers once the state reached what it considered equitable vaccination rates. Using the state’s original tier definitions, 29 counties now would be in the purple tier, which meant that the virus was widespread, including in the Bay Area, San Francisco, a Bay Area News Group analysis found.