Cal. Educ. Code § 90027

An indenture may include a clause relating to the bonds issued thereunder requiring the board to fix, prescribe, and collect rates, rentals, or other charges in connection with the services and facilities furnished from the project acquired, constructed, or purchased from part or all of the proceeds of the bonds, or from the revenues securing the bonds, sufficient to pay the principal of and interest on the bonds as they become due and payable, together with additional sums that may be required for any fund created by this article, for the further security of the bonds or as a depreciation charge or other charge in connection with the project.