Cal. Gov't Code § 29823
The treasurer shall register any warrant presented to him or her pursuant to Section 29821 or 29822 by endorsing upon the back of that warrant all of the following:
(c) That the warrant bears interest at the rate fixed by law from the date of registration to and including the date of maturity, or the date of the treasurer’s first notice pursuant to subdivision (b) of Section 29826.
Any warrant registered pursuant to this section shall be returned to the issuing officer for disbursement.