CA Health & Safety Code Section 6967

If the board does not order the formation of the proposed zone, an election on the question shall be conducted if, within 30 days of the date upon which the board did not order the formation, the board receives a petition requesting such an election signed by either of the following:

(a)

Not less than 35 percent of the voters who reside within the territory proposed to be included within the zone.

(b)

Not less than 35 percent of the number of owners of real property within the territory proposed to be included within the zone who also own not less than 35 percent of the assessed value of the real property within such territory.