Cal. Water Code § 74771

For the purposes of organization, or for any of any purpose for which the board is authorized to expend the collection of the first assessment, an indebtedness not exceeding in the aggregate an amount equivalent of twenty-five cents ($.25) for each acre of land in the district, and it may cause warrants of the district to issue therefor bearing interest at 7 percent per year from date of issue until the treasurer has funds available for the payment thereof.