Jason, I really do not know to much about California rules/regs. Sorry, but I just got another Sam Houston and I can't wait to put it in service. Leather Forever!
Cal/OSHA has a standard that covers firefighter helmets (Title 8 Section 3403), but it basically defers to the 1985 version of the NFPA 1972 standard. The actual text is below.
(b) Minimum Requirements, Structural Fire Fighting.
(1) Helmets ordered or purchased after January 1, 1988, for use in structural fire fighting shall be labeled as meeting the requirements contained in NFPA-1972 (1985) "Structural Fire Fighters' Helmets." While the helmets are in service:
(A) Section 3-8 "Ear Covers" shall be optional when protection required by Section 3405 is provided.
(B) Section 3-9 "Faceshields" shall be optional when protection required by Section 3404 is provided.
(C) Section 3-10 "Fluorescent Retroreflective Markings" shall be optional.