C.R.S. § 25-15-205

(1) Operation of a hazardous waste disposal site for which a certificate of designation has been issued shall not begin until the applicant obtains for such operation a federal permit issued under the federal act or a state permit issued under part 3 of this article. (2) A certificate of designation for a hazardous waste disposal site shall not become effective until such time as the certificated facility has received a permit under section 3005 (c) of the federal act or the equivalent state permit. (3) The burial of liquid hazardous waste both on-site and off-site is prohibited in this state. The commission may develop rules and regulations which phase out the land disposal of highly mobile, toxic, and persistent waste.