California Code, Harbors and Navigation Code - HNC § 5831

A certificate issued by the assessor of the county and filed in the proceedings, which states that the name of any signer of the petition appears upon the last equalized assessment-roll of the county for land assessed to him or her and located within the boundaries of the proposed district, is prima facie evidence that the signer is a freeholder within the proposed district.

A certificate signed by the county elections official, which states that the name of any signer of the petition is registered and uncanceled as a voter of the county and that he or she resides within the boundaries of the proposed district, is prima facie evidence that the signer is a registered voter within the proposed district.