Tex. Occ. Code § 1301.052
A person is not required to be licensed under this chapter to perform plumbing, other than plumbing performed in conjunction with new construction, repair, or remodeling, on a property that is:
(4) located inside a municipality that is within a county that has fewer than 50,000 inhabitants and that:
Added by Acts 2001, 77th Leg., ch. 1421, Sec. 3, eff. June 1, 2003.
Amended by Acts 2003, 78th Leg., ch. 819, Sec. 3(a), eff. Sept. 1, 2003.
Acts 2009, 81st Leg., R.S., Ch. 1380 (S.B. 1354), Sec. 2, eff. September 1, 2009.