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- Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these cycles:
2004
2006
2008
Waterbody Changes from Prior Cycle
For More Information:
Illinois Assessment Report
State Water Quality Program
Illinois Impaired Waters and TMDL Information
Assessed Waters of Illinois by Watershed
Search for a waterbody within Illinois
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Illinois Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
Description of this table| NOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those previously 303(d)-listed waters now attaining all applicable water quality standards. | ||
| Year Attaining | Number of Waters Attaining | Number of Causes of Impairment Addressed |
|---|---|---|
| 2005 |  38 |
112 |
Illinois 2002 Causes of Impairment for 303(d) Listed Waters
Description of this table| NOTE: Click on a cause of impairment (e.g. pathogens) to see the specific state-reported causes that are grouped to make up this category. Click on the "Number of Causes of Impairment Reported" to see a list of waters with that cause of impairment. | |
| Cause of Impairment Group Name | Number of Causes of Impairment Reported |
|---|---|
| Nutrients |  860 |
| Organic Enrichment/Oxygen Depletion | 296 |
| Ammonia | 287 |
| Metals (other than Mercury) | 287 |
| Habitat Alterations | 240 |
| Sediment | 236 |
| Turbidity | 210 |
| Polychlorinated Biphenyls (PCBs) | 191 |
| Pathogens | 160 |
| Algal Growth | 140 |
| Salinity/Total Dissolved Solids/Chlorides/Sulfates | 126 |
| Toxic Organics | 114 |
| pH/Acidity/Caustic Conditions | 99 |
| Flow Alteration(s) | 67 |
| Mercury | 62 |
| Noxious Aquatic Plants | 46 |
| Pesticides | 21 |
| Toxic Inorganics | 17 |
| Nuisance Exotic Species | 9 |
| Cause Unknown | 5 |
| Oil and Grease | 4 |
| Temperature | 2 |
| Chlorine | 1 |
Total: 3,480 Causes of Impairment
Illinois Cumulative TMDLs by Pollutant
This chart includes TMDLs since October 1, 1995.
Description of this table| NOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant. | ||
| Pollutant | Number of TMDLs | Number of Causes of Impairment Addressed |
|---|---|---|
| Manganese |  66 |
90 |
| Fecal Coliform | 59 |
60 |
| Phosphorus, Total | 46 |
94 |
| Phosphorus | 26 |
85 |
| Chloride | 12 |
15 |
| Atrazine | 11 |
11 |
| Biochemical Oxygen Demand (BOD) | 11 |
11 |
| Total Dissolved Solids (TDS) | 11 |
11 |
| Sulfates | 9 |
11 |
| Ammonia Nitrogen | 8 |
15 |
| Carbonaceous Bod | 8 |
8 |
| Sulfate | 8 |
9 |
| Ammonia | 7 |
7 |
| Iron | 7 |
7 |
| Silver | 7 |
7 |
| pH | 7 |
7 |
| Total Suspended Solids (TSS) | 6 |
8 |
| Nitrates | 5 |
9 |
| Copper | 3 |
3 |
| Total Ammonia | 3 |
3 |
| Cadmium | 2 |
2 |
| Nickel | 2 |
2 |
| Nitrate | 2 |
3 |
| Nitrogen, Total | 2 |
2 |
| Nutrients | 2 |
2 |
| Sediment | 2 |
2 |
| Siltation | 2 |
2 |
| Suspended Solids | 2 |
2 |
| Zinc | 2 |
2 |
| Inorganic Phosphorus | 1 |
1 |
| Nitrogen | 1 |
2 |
| Organic Phosphorus | 1 |
1 |
Total: 341 TMDLs; 494 Causes of Impairment Addressed
Illinois Cumulative Number of TMDLs
EPA Fiscal Year starts October 1 and ends September 30.
Description of this table
| NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year. | ||
| Fiscal Year | Number of TMDLs | Number of Causes of Impairment Addressed |
|---|---|---|
| 2002 | 9 |
9 |
| 2003 | 4 |
11 |
| 2004 | 66 |
108 |
| 2005 | 26 |
56 |
| 2006 | 19 |
30 |
| 2007 | 78 |
116 |
| 2008 | 78 |
93 |
| 2009 | 22 |
29 |
| 2010 | 3 |
4 |
| 2011 | 19 |
19 |
| 2012 | 17 |
19 |
Total: 341 TMDLs; 494 Causes of Impairment Addressed