Tex. Health & Safety Code § 283.101
The commissioners court may issue and sell bonds in the district's name and on the district's faith and credit to acquire, purchase, construct, equip, or enlarge the hospital or hospital system if:
(1) a tax may be imposed at a rate that:
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.