Cal. Water Code § 36408.5

Any warrant or negotiable notes authorized in the preceding section shall draw interest at a rate to be fixed by the board not to exceed eight (8) percent per year payable annually or semiannually as the board may prescribe. Negotiable notes shall be issued payable to bearer with a right of the district to provide for the registration and deregistration thereof in the same manner as bonds of the district. Interest coupons to bearer in a form and signed as prescribed by the board may be attached to such warrants or negotiable notes.