Cal. Water Code § 60270

Whenever the board deems it necessary for the district to incur a bonded indebtedness, the board shall, by resolution, so declare and state the purpose for which the proposed debt is to be incurred, the amount of debt to be incurred, the maximum term the bonds proposed to be issued shall run before maturity, which shall not exceed 40 years; the maximum rate of interest to be paid, which shall not exceed 8 percent per annum, and the measure to be submitted to the voters.