Cal. Sts. & High. Code § 35273.1

The legislative body shall not pass any ordinance forming a district under this part until it shall have procured such information as it deems necessary and adequate to enable it to determine whether there is public need for such facilities, whether the proposed district approximately covers the contiguous area needing such facilities, whether sufficient property within the proposed district will be benefited thereby, and whether the proposed improvements are located and designed in the manner most compatible with the greatest public good and the least private injury.