Tex. Transp. Code § 173.052
The following political subdivisions and other public entities may become a part of a district with the approval of the governing body of the political subdivision or public entity:
Added by Acts 2009, 81st Leg., R.S., Ch. 85 (S.B. 1540), Sec. 2.04, eff. April 1, 2011.
Acts 2011, 82nd Leg., R.S., Ch. 91 (S.B. 1303), Sec. 24.003(a), eff. September 1, 2011.