(a) Except as provided by Subsection (b), notwithstanding any other law:
(1) § 1301.551(i), Occupations Code, applies to a district as if the district were a municipality; and
(2) § 233.062, Local Government Code, applies to a district as if the district were in an unincorporated area of a county.
(b) Subsection (a) does not apply to a district:
(1) that before February 1, 2013, has adopted a fire code, fire code amendments, or other requirements in conflict with Subsection (a); and
(2) whose territory is located:
(A) in or adjacent to a general law municipality with a population of less than 4,000 that is served by a water control and improvement district governed by Chapter 51, Water Code; and
(B) in a county that has a population of more than 1.2 million and is adjacent to a county with a population of more than 600,000.