Cal. Gov. Code § 29969

If the entire issue of bonds is to mature at one time, such bonds may be called for redemption in numerical order at par and accrued interest on any interest-payment date prior to their fixed maturity, and a statement to that effect shall be set forth in each bond. No bond shall be callable or redeemable prior to its fixed maturity date, unless a statement that the bond is callable is contained in the bond.