California Code, Government Code - GOV § 71807

(a) For purposes of developing regional terms and conditions of employment for court interpreters and for collective bargaining with recognized employee organizations, the trial courts are divided into four regions, as follows:

(b) The Judicial Council shall adopt rules for the creation and operation of a regional court interpreter employment relations committee for each region, composed of representatives chosen by the trial courts within the region.

(c) The Judicial Council may divide each region into smaller subregions for purposes of coordinating the cross-assignment of court interpreters.