C.R.S. § 25-1.5-210

(1) With respect to the use of a rain barrel, as defined in section 37-96.5-102 (1), C.R.S., to collect precipitation from a residential rooftop pursuant to section 37-96.5-103 , C.R.S., the department, to the extent practicable within existing resources, shall develop best practices for: (a) Nonpotable usage of the collected precipitation; and (b) Disease and pest vector control. (2) If the department develops best practices in accordance with subsection (1) of this section, the department shall: (a) Post the best practices on the department’s website; and (b) Inform the state engineer of the best practices so that the state engineer can either post or link to the department’s best practices on the state engineer’s website.