Colo. Rev. Stat. § 37-46-124
Whenever in this article notice is provided for, if the court finds that due notice was not given, jurisdiction shall not thereby be lost or the proceedings abated or held void, but the court shall continue the hearing until such time as proper notice may be given and thereupon shall proceed as though proper notice had been given in the first instance. If any appraisement, assessment, levy, or other proceeding relating to said district is held defective, then the board of directors may file a motion in the cause in which said district was organized to perfect any such defect, and the court shall set a time for hearing thereon. If the original notice as a whole is held to be sufficient but faulty only with reference to publication as to certain particular lands or as to service as to certain persons, publication of the defective notice may be ordered as to the particular lands, or service may be made on the persons not properly served, and said notice is thereby corrected without invalidating the original notice as to other lands or persons.
C.R.S. § 37-46-124