Iowa Code § 28F.6
The principal of and interest on the bonds issued by an entity under the provisions of this chapter shall be payable solely from and secured by the net revenues of the project or projects and from other funds of the entity lawfully available therefor as provided in section 28F.5 and said bonds shall not in any respect be a general obligation of any public agency participating in said entity nor shall the entity or any public agency participating in said entity be in any manner liable by reason of such net revenues or other funds being insufficient to pay said bonds. All bonds issued by the entity shall contain a recital on their face that neither the payment of the principal nor any part thereof nor any interest thereon constitutes a debt, liability or obligation of any of the public agencies participating in the agreement creating such entity or of the entity itself, except that the entity shall be liable for the payment of such bonds from the net revenues derived from the project or projects and from the other moneys lawfully available therefor and pledged thereto pursuant to the provisions of the resolution which authorized their issuance. Said bonds issued by the entity shall be authorized by resolution which may be adopted at the same meeting at which it was introduced by a majority of the members of the governing body of the entity. The terms, conditions and provisions for the authorization, issuance, sale, and security of said bonds and of the holders thereof shall be set forth in said resolution.
Iowa Code § 28F.6