Cal. Wat. Code § 35539.4
The resolution pursuant to the hearing, or, when required, the proposition submitted to the qualified voters of the district pursuant to Section 35539.3, shall specify the due date for such special assessment and may provide that it is payable in two equal installments, the first of which shall be delinquent if not paid within five calendar months after the due date and the second of which shall be delinquent if not paid within nine calendar months after the due date, and, if no such provision for payment in installments is made, such resolution or, when required, such election proposition, shall provide that the entire special assessment becomes delinquent if not paid within six months after the due date.
The special assessment shall be collected pursuant to the provisions of Chapters 3, 4, 5 and 6 of Part 7 of this division.
Ca. Water Code § 35539.4