Tex. Local Government Code § 51.001: ORDINANCE, RULE, OR REGULATION NECESSARY TO CARRY OUT OTHER POWERS.

The governing body of a municipality may adopt, publish, amend, or repeal an ordinance, rule, or police regulation that:

(1) is for the good government, peace, or order of the municipality or for the trade and commerce of the municipality; and

(2) is necessary or proper for carrying out a power granted by law to the municipality or to an office or department of the municipality.

Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.