Tex. Health & Safety Code § 282.102
(b) After receiving a petition of at least five percent of the qualified taxpaying voters of a created district, the commissioners court may order an election to determine whether the district should have a tax assessor and collector other than the county tax assessor-collector. The commissioners court may order the election after:
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.