Water quality standards

The Water Quality Control Commission is responsible for adopting water quality standards for surface water and groundwater in Colorado. These standards (including use classifications, narrative and numerical standards, and antidegradation provisions) are set forth in specific commission regulations (see "Current water quality standards" link below). Standards are used for assessing the quality of Colorado waters and for establishing regulatory requirements for activities that may impact water quality.
Summary of rulemaking hearing process, triennial review hearings, external proposals and resources
Rulemakings for classifications and standards review, schedule of upcoming reviews, recent EPA actions
Impaired waters lists and related documents, including Section 303(d) list, point source discharge permits, SB 89-181 implementing agencies' memoranda of agreement and annual reports