POLLUTION LOCATOR| Water | Watershed Impairment

Clean Water Act Status: Middle Potomac-Anacostia-Occoquan 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 Potomac-Anacostia-Occoquan contains a portion of 13 counties:
    Percentage of Surface Waters with Reported Problems (state + EPA data): 27%
    Number of Waterbodies with Reported Problems (as reported by the state): 64
    Beneficial Use Most Frequently Impaired Percent of All Impairments
    Not Reported 100%


    Priority for Regulation     Number of Waterbodies
    Targeted 0
    High 9
    Medium 5
    Low 27
    Not Assessed for TMDL Priority 0
    Not Reported to US EPA for TMDL Priority 23
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  • Leading Pollutants/Stressors of Surface Waters
    Rivers, Streams, and Creeks
    Number of impaired waterbodies: 53
    Percent of Rivers, Streams and Creeks in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 98%
    Percent of Rivers, Streams and Creeks in MARYLAND assessed by agencies for 1997-98 reporting period: 39%
    Percent of Rivers, Streams and Creeks in VIRGINIA assessed by agencies for 1997-98 reporting period: 39%
      Percent Waterbodies Affected
    Organic Compounds 38%
    Ammonia 28%
    Pathogens 28%
    Metals 21%
    Nutrients 15%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 5
    Percent of Lakes, Reservoirs and Ponds in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 100%
    Percent of Lakes, Reservoirs and Ponds in MARYLAND assessed by agencies for 1997-98 reporting period: 27%
    Percent of Lakes, Reservoirs and Ponds in VIRGINIA assessed by agencies for 1997-98 reporting period: 93%
      Percent Waterbodies Affected
    Pathogens 60%
    Nutrients 40%
    Organic Compounds 40%
    Low Dissolved Oxygen/Organic Enrichment 20%
    Metals 20%
    More...

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


    Estuaries, Bays, and Coasts
    Number of impaired waterbodies: 6
    Percent of Estuaries and Bays in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 97%
    Percent of Estuaries and Bays in MARYLAND assessed by agencies for 1997-98 reporting period: 98%
    Percent of Estuaries and Bays in VIRGINIA assessed by agencies for 1997-98 reporting period: 99%
    Percent of Coastal Shorelines in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 97%
    Percent of Coastal Shorelines in MARYLAND assessed by agencies for 1997-98 reporting period: 100%
    Percent of Coastal Shorelines in VIRGINIA assessed by agencies for 1997-98 reporting period: 0%
      Percent Waterbodies Affected
    Organic Compounds 100%
    Pathogens 100%
    Low Dissolved Oxygen/Organic Enrichment 33%
    Metals 33%
    Sediments 33%
    More...

    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: 53(cause not reported for 30%)
    Percent of Rivers, Streams and Creeks in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 98%
    Percent of Rivers, Streams and Creeks in MARYLAND assessed by agencies for 1997-98 reporting period: 39%
    Percent of Rivers, Streams and Creeks in VIRGINIA assessed by agencies for 1997-98 reporting period: 39%
      Percent Waterbodies Affected
    Nonpoint Sources 57%
    Impairment source not reported 30%
    Natural Sources 15%
    Unknown Sources 13%
    Combined Sewer Overflows 9%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 5
    Percent of Lakes, Reservoirs and Ponds in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 100%
    Percent of Lakes, Reservoirs and Ponds in MARYLAND assessed by agencies for 1997-98 reporting period: 27%
    Percent of Lakes, Reservoirs and Ponds in VIRGINIA assessed by agencies for 1997-98 reporting period: 93%
      Percent Waterbodies Affected
    Nonpoint Sources 100%
    Combined Sewer Overflows 20%

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


    Estuaries, Bays, and Coasts
    Number of impaired waterbodies: 6
    Percent of Estuaries and Bays in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 97%
    Percent of Estuaries and Bays in MARYLAND assessed by agencies for 1997-98 reporting period: 98%
    Percent of Estuaries and Bays in VIRGINIA assessed by agencies for 1997-98 reporting period: 99%
    Percent of Coastal Shorelines in DISTRICT OF COLUMBIA assessed by agencies for 1997-98 reporting period: 97%
    Percent of Coastal Shorelines in MARYLAND assessed by agencies for 1997-98 reporting period: 100%
    Percent of Coastal Shorelines in VIRGINIA assessed by agencies for 1997-98 reporting period: 0%
      Percent Waterbodies Affected
    Nonpoint Sources 100%
    Combined Sewer Overflows 83%
    Municipal Point Sources 67%

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


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