Colo. Rev. Stat. § 35-13-103
The commissioner shall, in addition to other relevant criteria, use as a guide to make, promulgate, and enforce rules setting forth minimum general safety standards covering the design, construction, location, installation, and operation of equipment for storage, handling, transportation by tank truck or tank trailer, and utilization of anhydrous ammonia fertilizer such standards as provided in American national standards institute standard K61.1-1999, or subsequent revisions thereof. Said rules shall be as are reasonably necessary for the protection of the safety of the public and persons using such materials and shall be in substantial conformity with the generally accepted standards of safety concerning the same subject matter. Such rules shall be adopted by the commissioner only after a public hearing thereon.
C.R.S. § 35-13-103
For rule-making procedures, see article 4 of title 24.