Cal. Gov. Code § 6505.6
In lieu of the designation of a treasurer and auditor as set forth in Section 6505.5, the agency or entity may appoint one of its officers or employees to either or both of such positions. Such offices may be held by separate officers or employees or combined and held by one officer or employee. Such person or persons shall comply with the duties and responsibilities of the office or offices as set forth in subdivisions (a) to (d), inclusive, of Section 6505.5.
In the event the agency or entity designates its officers or employees to fill the functions of treasurer or auditor, or both, pursuant to this section, such officers or employees shall cause an independent audit to be made by a certified public accountant, or public accountant, in compliance with Section 6505.
Ca. Gov. Code § 6505.6