N.M. Stat. § 3-28-13
Revenue bonds issued under Chapter 3, Article 28 NMSA 1978 shall not be considered or held to be general obligations of the intercommunity water or natural gas supply association issuing them and shall be collectible only out of the net revenues derived from the operation of the water or natural gas system whose income is so pledged. Each of the bonds of any issue of revenue bonds so issued shall recite on its face that it is payable and collectible solely from the revenues derived from the operations of the water or natural gas system, the income of which is so pledged, and that the holders of the bonds may not look to any general or other fund for the payment of principal or interest of such obligations; provided, further, that such revenue bonds may additionally be secured by a mortgage on the properties of the association and that the properties may be conveyed to a trustee for the benefit and security of the holders of the bonds. To the extent provided in the bond resolution or the trust indenture securing such bonds, additional bonds may be issued on a parity basis with bonds issued previously, and bonds constituting a junior lien on the net revenues or properties may be issued unless prohibited by any such bond resolution or trust indenture.
NMS § 3-28-13