This chapter applies only to:
(1) a county with a population of 2.8 million or more;
(2) a district or authority created under Section 59, Article XVI, Texas Constitution, that:
(A) has boundaries coterminous with a county described by Subdivision (1); and
(B) is authorized to provide stormwater drainage and flood control facilities;
(3) a county with a population of more than 1.3 million for which the primary source of drinking water is an underground aquifer; or
(4) a county with a population of 800,000 or more that contains a portion of the Edwards Aquifer.