As needed because of the withdrawal or addition of a municipality or unincorporated area, population changes, or changes in combinations established under Section 452.573(b), the board of a subregional authority shall be restructured under Section 452.573(a):

1. (1) each fifth year as of September 1 after the date that the census data or population estimates become available; or
2. (2) when a municipality or unincorporated area withdraws from or joins the authority.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.