C.R.S. § 35-11-109

Any permit holder who replaces, alters, or modifies or who authorizes the replacement, alteration, or modification of chemigation equipment for an irrigation system which has been issued a chemigation permit shall notify the department within seven days of such replacement, alteration, or modification. Such notification shall be on a form provided by the department. The permit holder shall certify that the irrigation system as replaced, altered, or modified continues to comply with the provisions of this article.