Cleanest/Best Counties

National Average

Dirtiest/Worst Counties

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

LOS ANGELES County contains a portion of 6 watersheds:

Antelope-Fremont Valleys

Los Angeles

San Gabriel

San Pedro Channel Islands

Santa Clara

Santa Monica Bay

Percentage of Surface Waters with Reported Problems (state + EPA data): 25%

Number of Waterbodies with Reported Problems (as reported by the state): 123

Priority for Regulation	Number of Waterbodies
Targeted	0
High	49
Medium	15
Low	11
Not Assessed for TMDL Priority	0
Not Reported to US EPA for TMDL Priority	48

Rivers, Streams, and Creeks
Number of impaired waterbodies: 52
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Pathogens	69%
Metals	50%
Nutrients	48%
Ammonia	37%
Debris	37%
More...

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

Rivers, Streams, and Creeks
Number of impaired waterbodies: 52
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Nonpoint Sources	100%
Hydromodification/Habitat Modification	2%

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

Scorecard's report on

• Watershed indicators
• Toxic chemical releases from industrial facilities (TRI)
• Criteria air pollutants
• Hazardous air pollutants
• Land contamination

Drinking Water Sources for this County