Government Code § 54420
ARTICLE 4. Provisions Relating to Bonds
The bonds are special obligations of the local agency and are secured by a pledge of and shall be a charge upon, and shall be payable, as to the principal thereof, interest thereon, and any premiums upon the redemption of any thereof, solely from and secured by a lien upon the gross revenues of the enterprise and such funds as are described in the resolution authorizing the issuance of the bonds.