Code of Colorado Regulations
1000 - Department of Public Health and Environment
1002 - Water Quality Control Commission (1002 Series)
5 CCR 1002-93 - REGULATION NO. 93 - COLORADO'S SECTION 303(D) LIST OF IMPAIRED WATERS AND MONITORING AND EVALUATION LIST
Section 5 CCR 1002-93.2 - Purpose
Current through Register Vol. 47, No. 5, March 10, 2024
This regulation establishes Colorado's Lists of Impaired Waters. These waters include Water-Quality-Limited Segments Requiring Total Maximum Daily Loads ("TMDLs"), Impaired Water Bodies with Approved TMDLs and 4b Plans, and Colorado's Monitoring and Evaluation List.
(1) The list of Water-Quality-Limited Segments Requiring TMDLs fulfills requirements of section 303(d) of the federal Clean Water Act which requires that states submit to the U.S. Environmental Protection Agency a list of those waters for which technology-based effluent limitations and other required controls are not stringent enough to implement water quality standards. These segments are identified in Section 93.3 with an entry of "5. - 303(d) list" in the Category/List column.
(2) Colorado's Monitoring and Evaluation List (M&E List) identifies water bodies where there is reason to suspect water quality problems, but there is also uncertainty regarding one or more factors, such as the representative nature of the data. This M&E List is a state-only document that is not subject to EPA approval. These segments are identified in Section 93.3 with an entry of "3b. - M&E list" in the Category/List column.
(3) Waterbodies where at least one classified use is not being supported, but a TMDL is not needed because either a TMDL or a 4b plan (i.e., other pollution control requirements) has already been developed, are identified in Section 93.3 with an entry of "4a. - TMDL" or "4b. - 4b plan" in the Category/List column.
