Loans shall be secured by a general obligation pledge or a revenue pledge of the recipient. The obligation of the recipient to make loan repayments from the sources identified in its revolving fund loan agreement shall be absolute and unconditional, and shall not be subject to diminution by setoff, counterclaim, or abatement of any kind.

(1) General obligation. Repayment of the loan may be secured by a general obligation pledge. The recipient shall pledge to include in its budget an amount sufficient to pay the principal and interest on the loan when due. For so long as the loan is outstanding, the recipient shall ensure adequate funds are available to enable timely loan repayment, which may require the recipient to levy additional annual taxes against the taxable property within its boundaries. The full faith, credit, and resources of the recipient shall be pledged irrevocably for the annual levy and collection of those taxes and the prompt payment of the principal of and interest on the loan.

(2) Revenue obligation. Repayment of a loan may be secured by an irrevocable pledge of the net revenues of the recipient's utility and, in appropriate cases, utility local improvement district assessments.

Repayment of a loan shall constitute a lien and charge upon the net revenues of the recipient's utility prior and superior to any other charges whatsoever, except that the lien and charge shall be junior and subordinate to the lien and charge of any senior lien obligations. If applicable, repayment of a loan shall constitute a lien and charge upon utility local improvement district assessments prior and superior to any other charges whatsoever.

(3) Tribal governmental enterprises. Federally recognized Indian tribes may provide loan security through dedicated revenue from governmental enterprises. The recipient must demonstrate that the security used has a sufficient track record of income to secure the loan. Tribal governmental enterprises may include leases, gaming as provided under approved gaming compacts, forestry, or other tribal government-owned enterprises.