Cal. Pub. Util. Code § 50242
The board may at any time prior to the issuance and sale of any bonds provide for the call and redemption of any or all of the bonds on any interest payment date prior to their fixed maturity at not exceeding the par value and accrued interest plus a premium of not exceeding 5 percent upon the principal amount of the bonds, in which event the call price fixed by the board shall be set forth on the face of the bond. Notice of such redemption shall be published. If there is no newspaper of general circulation printed and published within the district, then the publication shall be made in a newspaper of general circulation printed and published within the county in which the district or any part thereof is situated. The first publication shall be at least 30 days prior to the date fixed for the redemption. After the date fixed for such redemption interest on the bonds thereafter shall cease.
Ca. Pub. Util. Code § 50242