California Code, Health and Safety Code - HSC § 4715

If written objection to the formation of the district, signed by 5 percent of the voters registered in the district if the district contains less than 2001 registered voters, or by 2 percent of the registered voters, but not less than 100 registered voters, if the district contains 2001, or more, registered voters, is filed with the board, it shall, and in any event it may, either adopt an order abandoning the formation of the proposed district or order the matter of the formation of the district with the boundary lines determined at the close of the hearing submitted to the voters of the proposed district at an election.