Water Code § 74770
CHAPTER 2. Limitation on Indebtedness
The board has no power, except as provided in this division as to certificates of indebtedness, notes, special assessments, and the issuance of bonds by the district, to incur any debt or liability whatever in excess of the express provisions of this division. Any debt or liability incurred in excess of such express provisions, except as to certificates of indebtedness, notes, special assessments, and the issuance of bonds, is absolutely void.