Governor Gavin Newsom issued a statewide shelter in place order tonight. The order applies to all individuals and businesses except those considered "essential services." The order is to stay at home until further notice. The order includes general information about what activities are considered "essential" citing sixteen critical infrastructure sectors defined by the federal Cybersecurity and Infrastructure Agency (CISA) under the Department of Homeland Security. These services are defined as "assets, systems, and networks, whether physical or virtual, are considered so vital...that their incapacitation or destruction would have a debilitating effect on security, economic security, public health or safety". CISA  lists these services as: 

1. Chemical Sector

2. Commercial Facilities Sector

3. Communications Sector

4. Critical Manufacturing Sector

5. Dams Sector

6. Defense Industrial Base Sector

7. Emergency Services Sector

8. Energy Sector

9. Financial Services Sector

10. Food and Agriculture Sector

11. Government Facilities Sector

12. Healthcare and Public Health Sector

13. Information Technology Sector

14. Nuclear Reactors, Materials, and Waste Sector

15. Transportation Systems Sector

16. Water and Wastewater Systems Sector

Here is the governor's full executive order.