Cal. Water Code § 36408.6

Warrants or negotiable notes of any district may be issued to evidence the indebtedness allowed to be incurred prior to the levy of the first district assessment, bearing interest fixed by the board at not more than eight (8) percent per year. These warrants or negotiable notes shall be made payable on a date not later than the first day of July next after the first annual assessment in the district is levied.