From KQED’s Matthew Green:

The locations listed in the map below are community testing sites in the nine-county Bay Area that don’t require referrals, membership or insurance (although some sites will bill the insurance providers of patients who have coverage). Click the magnifying glass at the bottom to search locations. View the full resource list here.

https://www.kqed.org/news/11818312/map-free-covid-19-testing-sites-in-the-bay-area