POLLUTION LOCATOR| Water | Watershed Impairment

Clean Water Act Status: Middle San Joaquin-Lower Watershed
 
 
  • Clean Water Act Comparative Ranking
    Cleanest/Best Watersheds National Average Dirtiest/Worst Watersheds
    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 watersheds by assessed use impairments
    Rank counties by assessed use impairments.
    Rank states by assessed use impairments, impairments due to specific causes, or impairments due to specific sources

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  • 1998 Clean Water Act Status
    Middle San Joaquin-Lower contains a portion of 3 counties:
    FRESNO County, CA
    MADERA County, CA
    MERCED County, CA
    Percentage of Surface Waters with Reported Problems (state + EPA data): 100%
    Number of Waterbodies with Reported Problems (as reported by the state): 4
    Grasslands Marshes
    Mud Slough
    Salt Slough
    San Joaquin River
    Beneficial Use Most Frequently Impaired Percent of All Impairments
    Not Reported 100%


    Priority for Regulation     Number of Waterbodies
    Targeted 0
    High 4
    Medium 0
    Low 0
    Not Assessed for TMDL Priority 0
    Not Reported to US EPA for TMDL Priority 0
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  • Leading Pollutants/Stressors of Surface Waters
    Rivers, Streams, and Creeks
    Number of impaired waterbodies: 3
    Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%
      Percent Waterbodies Affected
    Metals 100%
    Pesticides 100%
    Salinity/TDS/Chlorides 100%
    Unknown 100%

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






    Fresh Water Wetlands
    Number of impaired waterbodies: 1
      Percent Waterbodies Affected
    Metals 100%
    Salinity/TDS/Chlorides 100%

    NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.
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  • Leading Sources of Water Quality Problems
    Rivers, Streams, and Creeks
    Number of impaired waterbodies: 3
    Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%
      Percent Waterbodies Affected
    Agriculture 100%
    Unknown Sources 33%

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






    Fresh Water Wetlands
    Number of impaired waterbodies: 1
      Percent Waterbodies Affected
    Agriculture 100%

    NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.
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  • Links
    U.S. EPA Watershed Health Index
    U.S. EPA Condition and Vulnerability Indicators
    U.S. EPA Watershed Profile
    U.S. Geological Survey: Water Resources Links
    USGS report on the National Water-Quality Assessment (NAWQA) study unit this watershed is in.
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