Tex. Water Code § 66.401

After a district has completed all construction of facilities provided in the plan and conveyed those facilities to the designated counties and after all bonds and other indebtedness of the district are paid in full, the district shall submit to the commission a petition for dissolution accompanied by such evidence as the commission requires in its rules or by order to show that the plan prepared and adopted in accordance with Section 66.202 of this chapter has been carried out and all bonds and other indebtedness have been paid in full.