COVID Community Transmission Levels: See Where Your Bay Area County Stands


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The entire Bay Area is classified under either 'Substantial' or 'High' community transmission levels for COVID.

The San Francisco Chronicle states:

According to the CDC’s data definitions for case rates, low transmission is anything between 0 and 9.99 weekly new cases per 100,000 residents during the last seven days. Moderate is 10-49.99, substantial is 50-99.99, and high is 100 and up.

As of Wednesday July 28th, each Bay Area county is categorized under the following:

  • ALAMEDA - HIGH
  • CONTRA COSTA - HIGH
  • MARIN - SUBSTANTIAL
  • NAPA - SUBSTANTIAL
  • SANTA CLARA - SUBSTANTIAL
  • SAN FRANCISCO - HIGH
  • SAN MATEO - SUBSTANTIAL
  • SONOMA - SUBSTANTIAL
  • SOLANO - HIGH

The CDC recommends that residents wear masks indoors in regions where COVID is significantly present.

More information here.


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