POLLUTION LOCATOR| Water | State Clean Water Act Status Report

Clean Water Act Status: ILLINOIS
 
 
  • 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 ILLINOIS or in the U.S. by assessed use impairments.
    Rank watersheds in ILLINOIS 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
    ILLINOIS contains a portion of 49 watersheds.
    Percentage of Surface Waters with Reported Problems (state + EPA data): 7%
    Number of Waterbodies with Reported Problems (as reported by the state): 738
    Beneficial Use Most Frequently Impaired Percent of All Impairments
    Overall Use 100%
    Primary Contact Recreation (Swimming) 80%
    Aquatic Life Support 80%
    Fish Consumption 77%
    SecondaryContact Recreation (Boating) 30%
    Drinking Water Supply 2%
    Beneficial uses not reported for 100% of waterbodies.


    Priority for Regulation     Number of Waterbodies
    Targeted 25
    High 347
    Medium 208
    Low 157
    Not Assessed for TMDL Priority 1
    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: 537 (cause not reported for 0%)
    Percent of Rivers, Streams and Creeks in ILLINOIS assessed by agencies for 1997-98 reporting period: 33%
      Percent Waterbodies Affected
    Nutrients 82%
    Sediments 78%
    Other Habitat Alterations 31%
    Metals 28%
    Low Dissolved Oxygen/Organic Enrichment 26%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 201 (cause not reported for 1%)
    Percent of Lakes, Reservoirs and Ponds in ILLINOIS assessed by agencies for 1997-98 reporting period: 61%
      Percent Waterbodies Affected
    Sediments 97%
    Nutrients 96%
    Low Dissolved Oxygen/Organic Enrichment 85%
    Noxious Aquatic Plants 72%
    Metals 18%
    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: 537 (cause not reported for 0%)
    Percent of Rivers, Streams and Creeks in ILLINOIS assessed by agencies for 1997-98 reporting period: 33%
      Percent Waterbodies Affected
    Agriculture 73%
    Hydromodification/Habitat Modification 55%
    Municipal Point Sources 42%
    Urban Runoff/Storm Sewers 26%
    Resource Extraction 18%
    More...

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


    Lakes, Reservoirs, and Ponds
    Number of impaired waterbodies: 201 (cause not reported for 1%)
    Percent of Lakes, Reservoirs and Ponds in ILLINOIS assessed by agencies for 1997-98 reporting period: 61%
      Percent Waterbodies Affected
    Other Sources 94%
    Agriculture 77%
    Hydromodification/Habitat Modification 59%
    Urban Runoff/Storm Sewers 39%
    Land Disposal 22%
    More...

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




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