California Code, Government Code - GOV § 27131

(a) The board of supervisors in each county or city and county may, if the county or city and county is investing surplus funds, establish a county treasury oversight committee.  The board of supervisors, in consultation with the county treasurer, shall determine the exact size of the committee, which shall consist of from 3 to 11 members, and the categories from which the members shall be represented, as specified in subdivisions (a) to (g), inclusive, of Section 27132.  Members shall be nominated by the treasurer and confirmed by the board of supervisors.

(b) In recognition of the state and local interests served by the action made optional in subdivision (a), the Legislature encourages local agencies to continue taking the action formerly mandated by this section.  However, nothing in this subdivision may be construed to impose any liability on a local agency that does not continue to take the formerly mandated action.