California Code, Streets and Highways Code - SHC § 19215

If a petition, signed by 15 or more taxpayers and residents of the area sought to be annexed, but less than the number of owners representing one-fourth of the amount of assessed value of real property in that area and less than the number of owners specified in subdivision (d) of Section 19210 of this chapter, is presented to the board of supervisors, the board, if the petition for such annexation expressly requests them so to do, shall order an election within the territory sought to be annexed.

The election shall be ordered by the board of supervisors at a hearing, after establishing the boundaries.  To the extent applicable, the election shall be called and conducted in the same manner as an election for formation.

If a majority of votes cast are in favor of the proposition of annexing the territory to the district, such territory shall become a part of the highway lighting district.