Colorado
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Water Quality Standards for Colorado |
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- The Basic Standards And Methodologies
for Surface Water, Regulation No. 31 - (PDF,
671KB)
- (Effective August 1, 2001) This regulation provides basic
water quality standards, an antidegradation rule and implementation
process, and a system for classifying state surface waters,
for assigning water quality standards, for granting temporary
modifications, and for periodic review of the classifications
and standards.
- Colorado River Salinity Standards,
Regulation No. 39 - (PDF, 596K)
- The regulation establishes water quality standards for salinity
in the Colorado River Basin.
- Water Quality Standards for Salinity--Colorado
River System, June 1999 - (PDF, 7.4M)
-
- Water Quality Standards for Salinity--Colorado
River System, October 1999 - (PDF, 2.9M)
Classifications and Numeric Standards.
The following regulations provide classifications and numeric
water quality criteria for the indicated rivers and basins.
-
- Classifications And Numeric Standards
for Arkansas River Basin, Regulation No. 32 - (PDF,
700KB) and Tables (PDF, 217KB)
- (Effective May 19, 2003)
- Classifications And Numeric Standards
for Upper Colorado River Basin And North Platte River, Regulation
No. 33 - (PDF, 273KB) and Tables
(PDF, 93KB)
- (Effective July 10, 2002)
- Classifications And Numeric Standards
for San Juan River And Dolores River Basins, Regulation
No. 34 - (PDF, 61KB), Statement
of Basis and Purpose (PDF, 169KB) and Tables
(PDF, 140KB)
- (Effective October 1, 2002)
- Classifications And Numeric Standards
for San Juan Gunnison And Lower Dolores River Basins, Regulation
No. 35 - (PDF, 199KB) and Tables
(PDF, 139KB)
- (Effective February 8, 2002)
- Classifications And Numeric Standards
for Rio Grande Basin, Regulation No. 36 -
(PDF, 153KB) and Tables (PDF,
114KB)
- (Effective December 6, 2002)
- Classifications And Numeric Standards
for Lower Colorado River Basin, Regulation No. 37
- (PDF, 278KB) and Tables
(PDF, 123KB)
- (October 1, 2002)
- Classifications And Numeric Standards
for South Platte River Basin, Laramie River Basin, Republican
River Basin, Smoky Hill River Basin, Regulation No. 38
- (PDF, 1.2MB) and Tables
(PDF, 301KB)
- (Effective March 27, 2002)
Colorado's water quality standards are applicable to "waters
of the State". In some limited instances, the definition
adopted by Colorado for "waters of the State" as part
of its water quality standards may result in water quality standards
that are more comprehensive than required under section 303(c)
of the Clean Water Act and the implementing federal regulations.
EPA has included the State's water quality standards in their
entirety here for context and as supplementary information for
the reader.
Colorado water quality standards apply to all waters within
the State of Colorado, with the exception of those waters that
are within Indian Country, as defined in 18 U.S.C. Section 1151.
EPA's approval of Colorado's water quality standards was not intended
as an action to approve or disapprove water quality standards
applying to waters within Indian Country. EPA, or eligible Indian
Tribes, as appropriate, will retain responsibilities for water
quality standards within Indian Country. Information
on Tribal Water Quality Standards.
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