POLLUTION LOCATOR| Water | State Clean Water Act Status Report

Clean Water Act Status: IOWA
 
 
  • Clean Water Act Comparative Ranking
    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 IOWA or in the U.S. by assessed use impairments.
    Rank watersheds in IOWA 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
    IOWA contains a portion of 55 watersheds.
    Percentage of Surface Waters with Reported Problems (state + EPA data): 6%
    Number of Waterbodies with Reported Problems (as reported by the state): 159
    Beneficial Use Most Frequently Impaired Percent of All Impairments
    Aquatic Life Support 51%
    Primary Contact Recreation (Swimming) 22%
    Overall Use 5%
    Drinking Water Supply 4%
    Beneficial uses not reported for 100% of waterbodies.


    Priority for Regulation     Number of Waterbodies
    Targeted 2
    High 12
    Medium 9
    Low 28
    Not Assessed for TMDL Priority 68
    Not Reported to US EPA for TMDL Priority 40
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  • Leading Pollutants/Stressors of Surface Waters
    Rivers, Streams, and Creeks
    Number of impaired waterbodies: 56
    Percent of Rivers, Streams and Creeks in IOWA assessed by agencies for 1997-98 reporting period: 14%
      Percent Waterbodies Affected
    Sediments 36%
    Pathogens 32%
    Unknown 29%
    Nutrients 11%
    Low Dissolved Oxygen/Organic Enrichment 5%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 91
    Percent of Lakes, Reservoirs and Ponds in IOWA assessed by agencies for 1997-98 reporting period: 52%
      Percent Waterbodies Affected
    Sediments 70%
    Nutrients 29%
    Unknown 15%
    Noxious Aquatic Plants 14%
    Low Dissolved Oxygen/Organic Enrichment 14%
    More...

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


    Estuaries, Bays, and Coasts
    Number of impaired waterbodies: 1
      Percent Waterbodies Affected
    Pathogens 100%

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


    Fresh Water Wetlands
    Number of impaired waterbodies: 11
      Percent Waterbodies Affected
    Sediments 91%
    Noxious Aquatic Plants 9%
    Low Dissolved Oxygen/Organic Enrichment 9%

    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: 56 (cause not reported for 66%)
    Percent of Rivers, Streams and Creeks in IOWA assessed by agencies for 1997-98 reporting period: 14%
      Percent Waterbodies Affected
    Impairment source not reported 66%
    Unknown Sources 23%
    Agriculture 4%
    Municipal Point Sources 4%
    Industrial Point Sources 2%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 89 (cause not reported for 64%)
    Percent of Lakes, Reservoirs and Ponds in IOWA assessed by agencies for 1997-98 reporting period: 52%
      Percent Waterbodies Affected
    Impairment source not reported 64%
    Agriculture 33%
    Urban Runoff/Storm Sewers 4%
    Natural Sources 3%
    Unknown Sources 2%
    More...

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


    Estuaries, Bays, and Coasts
    Number of impaired waterbodies: 1 (cause not reported for 100%)
      Percent Waterbodies Affected
    Impairment source not reported 100%

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


    Fresh Water Wetlands
    Number of impaired waterbodies: 11 (cause not reported for 100%)
      Percent Waterbodies Affected
    Impairment source not reported 100%

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