Texas Health and Safety Code - HEALTH & SAFETY § 122.005. Powers of Type A General-Law Municipality

(1) prevent the introduction of a communicable disease into the municipality, including stopping, detaining, and examining a person coming from a place that is infected or believed to be infected with a communicable disease;

(2) establish, maintain, and regulate hospitals in the municipality or in any area within five miles of the municipal limits;  or

(3) abate any nuisance that is or may become injurious to the public health.

(1) necessary or expedient to promote health or suppress disease;  or

(2) to prevent the introduction of a communicable disease into the municipality, including quarantine rules, and may enforce those rules in the municipality and in any area within 10 miles of the municipality.