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).
October 15, 2024: Regulation #82, 401 Certification Regulation.
October 15, 2024: Regulation #61, Colorado Discharge Permit System Regulations.
October 15, 2024: Regulation #101, Written-Comment Only, Water Quality Civil Penalty Inflation Adjustment Regulation.
