Cal. Gov. Code § 8593

The Office of Emergency Services shall work with advocacy groups representing the deaf and hard of hearing, including, but not limited to, the California Association of the Deaf and the Coalition of Deaf Access Providers, California television broadcasters, city and county emergency services coordinators, and, as appropriate, the Federal Emergency Management Agency and the Federal Communications Commission, to improve communication with deaf and hard-of-hearing persons during emergencies, including the use of open captioning by California television broadcasters when transmitting emergency information.