(a) The commissioners court shall establish procedures for adopting and enforcing regulations and district boundaries. A regulation or district boundary is not effective until it is adopted by the commissioners court after a public hearing on the matter at which parties in interest and citizens have an opportunity to be heard. Before the 15th day before the date of the hearing, the commissioners court must publish notice of the hearing in a newspaper of general circulation in the county.
(b) The commissioners court by a majority vote may amend or reject a regulation or boundary proposed by the commission.

(c) If a proposed change to a regulation or boundary is protested in accordance with this subsection, the proposed change must receive, in order to take effect, the affirmative vote of at least three-fourths of all members of the commissioners court. The protest must be written and signed by the owners of at least 20 percent of either:
(1) the area of the lots covered by the proposed change; or
(2) the lots immediately adjacent to the rear of the lots covered by the proposed change and extending 200 feet from those lots or from the street frontage of the opposite lots.
(d) After the commissioners court receives the protest, the court shall hold a public hearing. The court shall publish notice in the manner provided by Subsection (a).