May 8, 2023: Regulation #93, Colorado’s Section 303(d) List of Impaired Waters and Monitoring and Evaluation List.
August 14, 2023: Regulation #11, Colorado Primary Drinking Water Regulations.
October 10, 2023: Written-Comment Only: Regulation #101, Water Quality Civil Penalty Inflation Adjustment Regulation.
November 13, 2023: Regulation #86, Graywater Control Regulation
April 10, 2023: Regulation #85, #31, and #32-38, Nutrients Management Control Regulation, Basic Standards and Methodologies for Surface Water, and Classifications Numeric Standards for the Arkansas, Upper Colorado, North Platte, San Juan, Dolores, Gunnison, Lower Dolores, Rio Grande, Lower Colorado, South Platte, Laramie, Republican, Smoky Hill River Basins.
June 10, 2024: Regulation #31 and #33, The Basic Standards and Methodologies for Surface Water and Classifications and Numeric Standards for Upper Colorado River Basin and North Platte River (Planning Region 12).
