Cal. Sts. & High. Code § 8700

In the event bonds are ordered to be issued, the unpaid assessments, as shown on the list filed by the street superintendent and determined by the legislative body, and any reassessments which may be issued thereon or in lieu thereof, together with interest thereon, shall remain and constitute a trust fund for the redemption and payment of the principal of the bonds and for the interest which may be due thereon.