Tex. Ins. Code § 2253.001
(a) Notwithstanding any other provision of this code, an insurer, in writing residential property or personal automobile insurance, may use rating territories that subdivide a county only if:
Added by Acts 2005, 79th Leg., Ch. 727 (H.B. 2017), Sec. 2, eff. April 1, 2007.
Acts 2007, 80th Leg., R.S., Ch. 730 (H.B. 2636), Sec. 3B.073(a), eff. September 1, 2007.
Acts 2007, 80th Leg., R.S., Ch. 921 (H.B. 3167), Sec. 9.073(a), eff. September 1, 2007.