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

OKLAHOMA contains a portion of 61 watersheds.

Percentage of Surface Waters with Reported Problems (state + EPA data): 10%

Number of Waterbodies with Reported Problems (as reported by the state): 531

Rivers, Streams, and Creeks
Number of impaired waterbodies: 394 (cause not reported for 0%)
Percent of Rivers, Streams and Creeks in OKLAHOMA assessed by agencies for 1997-98 reporting period: 14%

	Percent Waterbodies Affected
Sediments	45%
Nutrients	39%
Pesticides	36%
Low Dissolved Oxygen/Organic Enrichment	26%
Metals	16%
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NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

Rivers, Streams, and Creeks
Number of impaired waterbodies: 394 (cause not reported for 4%)
Percent of Rivers, Streams and Creeks in OKLAHOMA assessed by agencies for 1997-98 reporting period: 14%

	Percent Waterbodies Affected
Agriculture	49%
Unknown Sources	36%
Other Sources	18%
Hydromodification/Habitat Modification	17%
Urban Runoff/Storm Sewers	16%
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NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.