Recent and Pending Reviews

Recent and Pending Water Quality Classifications and Standards Hearings

• April 8, 2013 Arsenic Temporary Modifications Rulemaking (Regulsations #32-#38)   
• December 10, 2012 Temporary Modifications Rulemaking (Regulations #32, #33, #35, #36, #37, #38) 
• Regulation #31 - Basic Standards and Methodologies for Surface Water
• Regulations #32 (Arkansas) and #36 (Rio Grande)
• Regulations #33 (Upper Colorado and North Platte) and #37 (Lower Colorado)
• Regulations #34 (San Juan and Dolores) and #35 (Gunnison and Lower Dolores)
• Regulation #38 (South Platte, Laramie, Republican and Smoky Hill)

 Recent EPA Actions Regarding Colorado Water Quality Standards

• October 15, 2012 WQCC Response to EPA Partial Disapproval  of the 2012 revisions to the Basic Standards and Methodologies for Surface Water, Regulation #31 
• December 8, 2011 EPA action partially disapproving the 2012 revisions to the Basic Standards and Methodologies for Surface Water, Regulation #31 
• September 28, 2011 EPA action approving three sets of revisions to water quality standards in multiple segments throughout the State adopted by the Water Quality Control Commission in February 2010, July 2010 and January 2011
• August 22, 2011 WQCC response to June 17, 2011 EPA action disapproving the total phosphorus standard for Bear Creek Reservoir in the South Platte River Basin, Regulation #38
• August 4, 2011 EPA action partially approving the 2010 revisions to the Basic Standards and Methodologies for Surface Water, Regulation #31
• June 17, 2011 EPA Action disapproving the total phosphorus standard for Bear Creek Reservoir in the South Platte River Basin, Regulation #38
• September 28, 2010 EPA Action approving the site-specific water quality standards revisions to Marcy Gulch, segment 16g of the South Platte River Basin, Regulation #38
• March 17, 2010 EPA Action approving the water quality standards revisions to multiple segments of the South Platte River Basin, Regulation #38
• June 23, 2009 EPA Action approving the water quality standards revisions to temporary modifications for certain segments located in the Arkansas River Basin, Regulation #32, and the South Platte River Basin, Regulation #38; and site-specific water quality standards revisions to segments of the South Platte River Basin, Regulation #38
• December 23, 2008 EPA Action approving the water quality standards revisions to multiple segments of the Upper and Lower Colorado River Basins, Regulations #33 and #37
• March 28, 2008 EPA Action approving the water quality standards revisions to statewide organic chemical standards in Regulation #31; and temporary modifications for certain segments located in the Upper Colorado River Basin, Regulation #33, the Lower Colorado River Basin, Regulation #37, and the South Platte River Basin, Regulation #38
• November 13, 2007 EPA Action approving the water quality standards revisions for segments in the Arkansas River Basin, Regulation #32, the Rio Grande River Basin, Regulation #36 and the South Platte River Basin, Regulation #38
• October 30, 2006 EPA Action approving the water quality standards revisions for segments in the San Juan and Dolores River Basins, Regulation #34, the Gunnison and Lower Dolores River Basins, Regulation #35, and the South Platte, Laramie, Republican and Smoky Hill River Basins, Regulation #38

Your opinion is important to us.  If you have comments regarding this information, or wish to have additional information included, please email us at cdphe.wqcc@state.co.us.