Colo. Rev. Stat. § 30-11-511
A home rule county shall provide all mandatory county functions, services, and facilities and shall exercise all mandatory powers required by statute. A home rule county may provide such permissive functions, services, and facilities and may exercise such permissive powers as authorized by statute applicable to nonhome rule counties, except as may be otherwise prohibited or limited by the county charter or the constitution of Colorado. Any power, function, service, or facility vested by statute in a particular county officer, agency, or board, including a board of county commissioners, may be exercised or performed within a home rule county by such county officer, agency, or board or by any other county officer, agency, or board designated in the home rule charter. For home rule counties, the term "board of county commissioners" means the governing body of the county designated by the county.
C.R.S. § 30-11-511