Cal. Water Code § 72142

On or before 60 days after the effective date of this chapter, and on or before the third Wednesday in April of each year after 1975, the board shall adopt a budget and by resolution levy such two-dollar ($2)-per-acre-foot assessment, unless the board determines that the purposes of this chapter can be accomplished with a lesser assessment, in which case the board may, by resolution, levy such lesser assessment. Such assessment shall be applicable to all production within the Chino Basin during the fiscal year in which such assessment is levied.