There will be a number of tax rate changes in various cities and counties (California) starting April 1, 2021. The tax rate changes apply only within the indicated city or county limits. Find out more about where the rates will be changing by reading "New Sales and Use Tax Rates Operative April 1, 2021" in the CDTFA website.
https://www.cdtfa.ca.gov/formspubs/L797.pdf