If bonds are outstanding, the commissioners court shall establish, maintain, and collect rates and charges for services furnished or made available by the solid waste disposal system adequate to:

1. (1) pay maintenance and operation costs of and expenses allocable to the solid waste disposal system and the principal of and interest on the bonds; and
2. (2) provide and maintain funds created by the resolution authorizing the bonds.

Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.