“Population,” for the purpose of this chapter, shall be determined by the most recent United States decennial census; provided, however, whenever it appears to the department that the population of any city or county, changed sufficiently to warrant adjustment, the department for purposes of this chapter may request the Population Research Unit of the Department of Finance to determine the population for cities or counties.
Source:
Section 101180, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=101180..