Regulation 22: Site Location and Design Approval Regulations for Domestic Wastewater Treatment Works (amended 8/10/09, effective 9/30/09).
Regulation 23: Regulations for State of Colorado Continuing Planning Process (last update effective 8/30/97). A Guide to Colorado Programs for Water Quality Management and Safe Drinking Water: A Continuing Planning Process (updated 08/12/13, expiration date 12/31/18).
Regulation 31: The Basic Standards and Methodologies for Surface Water (amended 5/9/16, effective 6/30/16).
Regulation 38: Classifications and Numeric Standards for South Platte River Basin, Laramie River Basin, Republican River Basin, Smoky Hill River Basin (amended 1/11/16, effective 3/1/16). Regulation 43: On-Site Wastewater Treatment System Regulation (adopted 5/13/13, effective 6/30/13). Appendix 38-1, Stream Classifications and Water Quality Standards Tables.