California Code, Public Utilities Code - PUC § 2889.6

(a) Include in their telephone directory information concerning emergency situations which may affect the telephone network. The information shall include the procedures which the corporation will follow during emergencies, how telephone subscribers can best use the telephone network in an emergency situation, and the emergency services available by dialing “911.”

(b) Annually provide to all subscribers in the form of a billing insert, which need not be a separate document, information concerning emergency situations which may affect the telephone network. The information shall include the procedures which the corporation will follow during emergencies, how telephone subscribers can best use the telephone network in an emergency situation, and the emergency services available by dialing “911.” The billing insert shall additionally direct the subscriber to consult the telephone directory for similar information concerning the use of the telephone in emergency situations.