Iowa Code § 28J.24
Port authority revenue bonds and pledge orders issued under this chapter do not constitute a debt, or a pledge of the faith and credit, of the state or a political subdivision of the state, and the holders or owners of the bonds or pledge orders shall not have taxes levied by the state or by a taxing authority of a governmental agency of the state for the payment of the principal of or interest on the bonds or pledge orders, but the bonds and pledge orders are payable solely from the revenues and funds pledged for their payment as authorized by this chapter, unless the notes are issued in anticipation of the issuance of bonds or pledge orders or the bonds and pledge orders are refunded by refunding bonds issued under this chapter, which bonds, pledge orders, or refunding bonds shall be payable solely from revenues and funds pledged for their payment as authorized by those sections. All of the bonds or pledge orders shall contain a statement to the effect that the bonds or pledge orders, as to both principal and interest, are not debts of the state or a political subdivision of the state, but are payable solely from revenues and funds pledged for their payment.
Iowa Code § 28J.24
2005 Acts, ch 150, § 112