Wat. Code, § 31702

After the board of directors has furnished the estimates as required in Section 31701, the board of supervisors of each county, annually, at the time and in the manner of levying other county taxes, shall:

(a) Until each bonded debt is fully paid, levy upon the property within the district, or improvement district therein benefited by the bonded debt in the county, and cause to be collected a tax sufficient to pay the county’s proportion of the amount required to pay the principal of and interest on the bonded indebtedness to be known as the “____ County Water District Bond tax.”

(b) Until all charges, claims, expenditures and expenses other than a bonded debt of any improvement district created pursuant to this division have been fully paid, levy within such improvement district and cause to be collected a tax sufficient to pay the county’s proportion of the amount required to pay all said charges, claims, expenditures and expenses of each improvement district to be known as the “____ County Water District Improvement District No. ____ Tax.”

(c) Until all other expenses or claims against the district are fully paid, levy upon all of the property within the district in the county and cause to be collected a tax sufficient to pay the county’s proportion of the amount required to pay all those expenses or claims to be known and as the “____ County Water District General Tax.”