C.R.S. § 12-120-203

(1) This part 2 does not affect any of the following: (a) Individuals who normally operate and maintain machinery or equipment; (b) Individuals who perform engineering services for themselves; (c) Partnerships, professional associations, joint stock companies, limited liability companies, or corporations, or the employees of any such organizations, who perform engineering services for themselves or their affiliates; (d) Individuals who perform engineering services under the responsible charge of a professional engineer; (e) Work of a strictly agricultural nature that is not required to be of public record; (f) Professional land surveying as defined in section 12-120-302 (5); (g) Individuals who are employed by and perform engineering services solely for a county, city and county, or municipality; (h) Individuals who are employed by and perform engineering services solely for the federal government; (i) Individuals who practice architecture as defined in section 12-120-402 (5); (j) Utilities or their employees or contractors when performing services for another utility during times of natural disasters or emergency situations; or (k) Individuals who practice landscape architecture as defined in section 12-130-104 (6).