Cal. Water Code § 36559

If a fiscal year is adopted pursuant to Section 36558, in lieu of submitting the annual estimate at the time set forth in Section 36552, the board may, by resolution, establish that the annual estimate required by Section 36552 shall be filed within 90 days from the beginning of the district’s fiscal year so adopted. In that event, the annual assessment made pursuant to Section 36570 shall be made between the first day of the fiscal year and 90 days thereafter.