Cal. Sts. & High. Code § 10124

Notwithstanding Section 10123, the legislative body may delay the collection of the assessments imposed by Section 10123 until the time an assessment district is created pursuant to Section 10200 to pay the costs of a water supply system project, or a sanitary sewer and facilities project, where the costs of proposed improvements for such a project have been approved pursuant to Section 10123.