Cleanest/Best States

National Average

Dirtiest/Worst States

0%					50%					100%

Percentage of Surface Waters with Impaired or Threatened Uses (state + EPA data):

Number of Impaired Waterbodies (as reported by the state):

NOTE: Data limitations affect the accuracy of these rankings.

Rank counties in COLORADO or in the U.S. by assessed use impairments.
Rank watersheds in COLORADO by assessed use impairments
Rank states by assessed use impairments, impairments due to specific causes, or impairments due to specific sources

COLORADO contains a portion of 88 watersheds.

Percentage of Surface Waters with Reported Problems (state + EPA data): 3%

Number of Waterbodies with Reported Problems (as reported by the state): 79

Beneficial Use Most Frequently Impaired	Percent of All Impairments
Overall Use	99%

Beneficial uses not reported for 100% of waterbodies.

Priority for Regulation	Number of Waterbodies
Targeted	6
High	19
Medium	30
Low	23
Not Assessed for TMDL Priority	0
Not Reported to US EPA for TMDL Priority	1

Rivers, Streams, and Creeks
Number of impaired waterbodies: 70
Percent of Rivers, Streams and Creeks in COLORADO assessed by agencies for 1997-98 reporting period: 27%

	Percent Waterbodies Affected
Metals	83%
pH	13%
Sediments	11%
Impaired Biological Community	7%
Ammonia	6%
More...

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

Rivers, Streams, and Creeks
Number of impaired waterbodies: 70 (cause not reported for 100%)
Percent of Rivers, Streams and Creeks in COLORADO assessed by agencies for 1997-98 reporting period: 27%

	Percent Waterbodies Affected
Impairment source not reported	100%

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.