Tex. Spec. Dist. Code § 9051.258
If district bonds payable wholly or partly from revenue are issued, the board shall set by contract with the persons who contract with it for a water supply or water or sewer facilities the rates of compensation for water sold and water or sewer services provided by the district. The rates must be sufficient to pay:
Added by Acts 2015, 84th Leg., R.S., Ch. 855 (S.B. 1162), Sec. 1.06, eff. April 1, 2017.