Indiana Code Title 13. Environment § 13-21-8-3

(1) are special obligations of the district;

(2) are payable solely from and secured by a lien upon the revenues of all or part of the facilities whether or not the facilities are being financed with revenue bonds under this chapter or IC 13-9.5-9-4 (before its repeal), as shall be more fully described in the resolution authorizing the issuance of the revenue bonds;  and

(3) including interest, are not:

(1) the revenue bond, including interest, is payable solely from the revenues pledged to the bond's payment;  and

(2) neither the board or the district is under any obligation to pay the bond, except from those revenues.