Colo. Rev. Stat. § 25-15-213
Any county or municipality that operates a county or municipal hazardous waste disposal site or sites is authorized to establish a county or municipal hazardous waste disposal site fund. The board of county commissioners of such county or the governing body of the municipality may levy a hazardous waste disposal site tax in addition to any other tax authorized by law, on the taxable property within said county or municipality, the proceeds of which shall be deposited to the credit of said fund and appropriated to pay the cost of land, labor, equipment, and services needed in the operation of county or municipal hazardous waste disposal sites. Any such county or municipality is also authorized, after a public hearing, to fix, modify, and collect service charges from users of county or municipal hazardous waste disposal sites for the purpose of financing the operations at those sites.
C.R.S. § 25-15-213