Tex. Elec. Code § 42.0615
A political subdivision that changes its boundaries or the boundaries of districts used to elect members to the governing body of the political subdivision shall not later than the 30th day after the date the change is adopted:
Added by Acts 2005, 79th Leg., Ch. 709 (S.B. 427), Sec. 1, eff. September 1, 2005.