(a) The Department of Mental Health and Addiction Services shall designate substance abuse planning regions within the state. Such regions and the boundaries of such regions may be redesignated by said department as it deems necessary.
(b) The department shall designate subregions within each region established pursuant to subsection (a) of this section. The boundaries of such subregions may be redesignated by said department as it deems necessary. Each subregion shall be located entirely within the boundaries of a substance abuse planning region.