Tex. Occ. Code § 702.552
(a) The attorney general or a district or county attorney may file suit against a person who violates, or threatens to violate, this chapter to:
(b) Venue for a suit filed under this section is in a district court located in:
Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.