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Current Water Quality Standards

Currently Effective Standards

#31

Regulation #31 - Basic Standards and Methodologies for Surface Water (amended 9/11/12, effective 1/31/13)

#31	Regulation #31 - Basic Standards and Methodologies for Surface Water

#32

Regulation #32 - Classifications and Numeric Standards for Arkansas River Basin (amended 11/14/11, effective 1/1/12)

#32	Regulation #32 Numeric Standards Tables Regulation #32 Text Relating to Tables Regulation #32 Statements of Basis, Statutory Authority and Purpose (Historical contexts and rationales for revisions)

#33

Regulation #33 - Classifications and Numeric Standards for Upper Colorado River Basin and North Platte River (Planning Region 12) (amended 6/13/11, effective 1/1/12)

#33	Regulation #33 Numeric Standards Tables Regulation #33 Text Relating to Tables Regulation #33 Statements of Basis, Specific Statutory Authority and Purpose (Historical contexts and rationales for revisions)

Regulation #34 - Classifications and Numeric Standards for San Juan and Dolores River Basins (amended 11/5/12, effective 3/30/13)

Regulation #35 - Classifications and Numeric Standards for Gunnison and Lower Dolores River Basins (amended 11/5/12, effective 3/30/13)

#36

Regulation #36 - Classifications and Numeric Standards for Rio Grande River Basin (amended 6/13/11, effective 1/1/12)

#36	Regulation #36 Numeric Standards Tables Regulation #36 Text Relating to Tables Regulation #36 Statements of Basis, Specific Statutory Authority and Purpose (Historical contexts and rationales for revisions)

#37

Regulation #37 - Classifications and Numeric Standards for Lower Colorado River Basin (amended 6/13/11, effective 1/1/12)

#37	Regulation #37 Numeric Standards Tables Regulation #37 Text Relating to Tables Regulation #37 Statements of Basis, Specific Statutory Authority and Purpose (Historical contexts and rationales for revisions)

Regulation #38 - Classifications and Numeric Standards for South Platte River Basin, Laramie River Basin, Republican River Basin, Smoky Hill River Basin (amended October 9, 2012, effective March 1, 2013)

#39

Regulation #39 - Colorado River Salinity Standards (last update effective 8/30/97)

#39	Regulation #39 - Colorado River Salinity Standards

#41

Regulation #41 - The Basic Standards for Ground Water (amended 9/11/12, effective 1/31/13)

#41	Regulation #41 - The Basic Standards for Ground Water

#42

Regulation #42 - Site-Specific Water Quality Classification and Standards for Ground Water (amended 2/13/06, effective 3/30/06)

#42	Regulation #42 - Site-Specific Water Quality Classification and Standards for Ground Water

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