Cal. Gov. Code § 53205
From funds under its jurisdiction, the legislative body may authorize payment of all, or such portion as it may elect, of the premiums, dues, or other charges for health and welfare benefits of officers, employees, retired employees, former elective members specified in subdivision (b) of Section 53201, and retired members of the legislative body subject to its jurisdiction.
Those expenditures are charges against the funds. If the employer pays any portion of the premiums, dues, or other charges for the health and welfare benefits, any dividends paid or premiums refunded or other rebates or refunds under any of those health and welfare benefits up to the aggregate expenditures of the employer for the benefits are the employer's property. The excess, if any, shall be applied by the employer for the benefit of the employees or their dependents generally.
Ca. Gov. Code § 53205