C.R.S. § 32-1-204.7

(1) If a special district that was originally approved by a board of county commissioners becomes wholly contained within the boundaries of a municipality or municipalities by annexation or boundary adjustment, the governing body of the special district may petition the governing body of any such municipality to accept a designation as the approving authority for the special district. The municipality may accept the designation through the adoption of a resolution of approval by the governing body of the municipality. (2) Upon the adoption of the resolution by the governing body of any municipality pursuant to subsection (1) of this section, all powers and authorities vested in the board of county commissioners pursuant to this article shall be transferred to the governing body of the municipality, which shall constitute the approving authority for the special district for all purposes under this article.