The board of supervisors of each county in which there lies a maintenance area or any portion thereof shall annually, and at the time of levying county taxes, levy on the land within the county and within the area, or if zones are established, within each zone, an ad valorem assessment sufficient to raise the amount or amounts certified by the department.
Source:
Section 12878.35, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=WAT§ionNum=12878.35..