CAL. CCP. CODE § 1775.3 : California Code - Section 1775.3

(a) In the courts of the County of Los Angeles and in other courts that elect to apply this title, all at-issue civil actions in which arbitration is otherwise required pursuant to Section 1141.11, whether or not the action includes a prayer for equitable relief, may be submitted to mediation by the presiding judge or the judge designated under this title as an alternative to judicial arbitration pursuant to Chapter 2.5 (commencing with Section 1141.10) of Title 3.

(b) Any civil action otherwise within the scope of this title in which a party to the action is a public agency or public entity may be submitted to mediation pursuant to subdivision (a).