Cal. Water Code § 35186

Notwithstanding any other provision of law, or the bylaws of the district, all elections held after the effective date of this chapter within the district, including elections for directors and elections which are required by law to authorize any special taxes or bonded indebtedness, except special taxes or bonded indebtedness of an uninhabited improvement district, shall be conducted as resident voter elections in accordance with the provisions of this chapter. As used in this chapter, “uninhabited improvement district” means an improvement district having 12 or less registered voters residing therein.