Colo. Rev. Stat. § 40-6-115 (2026)

(1) Within thirty days after a final decision by the commission in any proceeding, any party to the proceeding before the commission may apply to the district court for a writ of certiorari or review for the purpose of having the lawfulness of the final decision inquired into and determined. Such writ shall be made returnable not later than thirty days after the date of issuance and shall direct the commission to certify its record in the proceeding to said court. On the return day, the cause shall be heard by the district court unless, for a good reason shown, the same be continued. No new or additional evidence may be introduced in the district court, but the cause shall be heard on the record of the commission as certified by it. The commission and each party to the action or proceeding before the commission shall have the right to appear in the review proceedings.

(2) The findings and conclusions of the commission on disputed questions of fact shall be final and shall not be subject to review, except that, in any proceeding wherein the validity of any order or decision is challenged on the ground that it violates any right of a petitioner under the constitution of the United States or the constitution of the state of Colorado, the district court shall exercise an independent judgment on the law and the facts, and the findings or conclusions of the commission material to the determination of the said constitutional question shall not be final.

(3) Upon review, the district court shall enter judgment either affirming, setting aside, or modifying the decision of the commission. So far as necessary to the decision and where presented, the district court shall decide all relevant questions of law and interpret all relevant constitutional and statutory provisions. The review shall not extend further than to determine whether the commission has regularly pursued its authority, including a determination of whether the decision under review violates any right of the petitioner under the constitution of the United States or of the state of Colorado, and whether the decision of the commission is just and reasonable and whether its conclusions are in accordance with the evidence.

(4) The provisions of the Colorado rules of civil procedure relating to writs of certiorari or review, so far as applicable and not in conflict with the provisions of this title, shall apply to proceedings had in the district court under the provisions of this section. No court of this state, except the district court to the extent specified, shall have jurisdiction to review, reverse, correct, or annul any order or decision of the commission, or to suspend or delay the execution or operation thereof, or to enjoin, restrain, or interfere with the commission in the performance of its official duties; but an action in the nature of mandamus shall lie from the district court to the commission in all proper cases.

(5) All actions for review shall be commenced and tried in the district court in and for the county in which the petitioner resides, or if a corporation or partnership in the county in which it maintains its principal office or place of business, or in the district court of the city and county of Denver, at the option of the petitioner. Appellate review may be obtained in the supreme court concerning any final judgment of the district court on review, affirming, setting aside, or modifying any decision of the commission, in the same manner and with the same effect as appellate review of judgments of the district court in other civil actions.

Source: L. 13: p. 497, § 52. C.L. § 2961. CSA: C. 137, § 52. L. 45: p. 531, § 8. CRS 53: § 115-6-15. C.R.S. 1963: § 115-6-15. L. 69: p. 949, § 47. L. 75: (1) and (4) amended, p. 227, § 90, effective July 16. L. 89: (4) amended, p. 1532, § 17, effective April 12. L. 92: (1) amended, p. 2131, § 3, effective July 1. L. 93: (1) amended, p. 2065, § 21, effective July 1.