The State Fire Marshal shall adopt regulations to authorize National Fire Protection Association 704 Standard System Diamonds, as provided in the 1985 Edition of the National Fire Protection Association 704, Standard System for Identification of Fire Hazards of Materials, be displayed at entrances to buildings and other locations where hazardous materials are stored.
Source:
Section 13143.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=13143.4..