303(d) and integrated reporting
The 2022 303(d) List of Water-Quality-Limited Segments Requiring TMDLs — 303(d) List and Colorado’s Monitoring and Evaluation List (M&E List) are included in Regulation 93. This regulation establishes Colorado’s List of Water-Quality-Limited Segments Requiring Total Maximum Daily Loads (TMDLs).
This list fulfills Section 303(d) of the federal Clean Water Act, which requires states to submit to the U.S. Environmental Protection Agency (EPA) a list of waters for which technology-based effluent limitations and other required controls aren’t stringent enough to implement water quality standards.