Tex. Health & Safety Code § 263.001
(a) Two or more adjacent counties may act together to carry out the purposes of this chapter and construct one or more hospitals for their joint use as provided by this chapter for a single county if:
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.
Acts 2015, 84th Leg., R.S., Ch. 1 (S.B. 219), Sec. 3.0821, eff. April 2, 2015.