Thomson Reuters has been the official publisher of the California Code of Regulations since 1990. In cooperation with the California Office of Administrative Law, this 38-volume set of official regulations is updated weekly by “Register” as these sections are amended, repealed, or added to by the more than 200 state agencies abiding by the “Rulemaking Law Under the Administrative Procedure Act.”

This set also includes an extensive subject index with nearly 160,000 references and 14,000 cross-references. Additionally, a statutes-to-regulations index has been compiled with nearly 266,000 entries. Update pages are provided in looseleaf format with summary digests and filing instructions.