Cal. Water Code § 71812

A district may issue negotiable promissory notes pursuant to this section for the purpose of acquiring funds to finance the construction or acquisition of administrative offices, construction headquarters, commercial offices, or facilities for similar district purposes and for the acquisition of land for district purposes. The maturity of such promissory notes shall not be later than 10 years from the date thereof. The total aggregate amount of such notes outstanding at any one time may be at least equal to fifty thousand dollars ($50,000) in any district, but shall not exceed the lesser of either three million dollars ($3,000,000) or 1 percent of the assessed valuation of the taxable property in the district, or, if the assessed valuation is not obtainable, 1 percent of the county auditor’s estimate of the assessed valuation of the taxable property in the district evidenced by his certificate. Promissory notes issued pursuant to Section 71811 may be disregarded in computing the aggregate amount of notes that may be issued pursuant to this section.