Colorado Revised Statutes Title 25. Health § 25-8-203. Classification of state waters

(a) The existing extent of pollution or the maximum extent of pollution to be tolerated as a goal;

(b) Whether or not pollution arises from natural sources;

(c) Present beneficial uses of the water, or the beneficial uses that may be reasonably expected in the future for which the water is suitable in its present condition, or the beneficial uses for which it is to become suitable as a goal;

(d) The character and uses of the land area bordering the water;

(e) The need to protect the quality of the water for beneficial uses such as domestic, agricultural, municipal, and industrial uses, the protection and propagation of fish and wildlife, recreation, drinking water, or such beneficial uses as the commission deems consistent with the policies of section 25-8-102 and the need to minimize negative impacts on water rights;

(f) The type and character of the water, such as surface or subsurface, lake or stream, together with volume, flow, depth, stream gradient, temperature, surface area involved, and daily or seasonal variability of any of such characteristics. Waters in ditches and other man-made conveyance structures shall not be classified, and water quality standards shall not be applied to them but may be utilized for purposes of discharge permits.