Texas Water Code Sec. § 49.502 Applicability This subchapter applies only to a district, other than a drainage district, located wholly or partly in a county: (1) that borders the Gulf of Mexico and the United Mexican States; or (2) that is adjacent to a county described by Subdivision (1). Added by Acts 2007, 80th Leg., R.S., Ch. 1430 (S.B. 3), Sec. 2.24, eff. September 1, 2007.