Tree care can vary by region, even in other areas affected by drought. The following websites generally have accurate information for the San Diego area.
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San Diego County Water Authority
San Diego Regional Urban Forests Council, tree watering advice and links
Kate Sessions Commitment (San Diego), How to get and grow a healthy tree
Hunter Irrigation
California ReLeaf
California Water Board
State of California, California Drought Action (webpage)
San Diego County Water Authority (SDWCA)'s Water News Network
AZCentral: What will happen to the Colorado River? What we know about looming water cuts (June 30, 2022)
San Diego Union Tribune: Hold off on that car wash. Drought restrictions begin Friday (June 9, 2022, Subscription required)
Fox 5 News: SD County prepares for statewide drought regulations (May 25, 2022)
UC Master Gardeners of Stanislaus County, Trees and the California Drought