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Illinois Assessment Data for 2008

Assessed Waters of Illinois by Watershed

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Display impaired waters and TMDL information only
Features


Site-specific Targeted Monitoring Summary Results

Illinois (2008)

Description of this table
  Size of Water
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)		 Great Lakes
Shoreline
(Miles)		 Great Lakes
Open Water
(Square Miles)
   Good Waters 6,227.3 5,586.1
      Previously impaired waters
      now attaining all uses
   Threatened Waters
      TMDL completed                         
      TMDL alternative                         
      Non-pollutant impairment                         
      TMDL needed                         
   Impaired Waters 9,341.6 141,775.2 2.5 63.0 151.3
      TMDL completed     419.4     2,015.0               
      TMDL alternative                         
      Non-pollutant impairment     499.9                    
      TMDL needed     8,422.4     139,760.2     2.5     63.0     151.3
Total Assessed Waters 15,568.9 147,361.2 2.5 63.0 151.3
Total Waters 71,394.0 318,477.0 2.5 63.0 1,526.0
Percent of Waters Assessed 21.8 46.3 100.0 100.0 9.9

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2008


Site-specific Targeted Monitoring Results

Illinois Rivers and Streams 2008

Description of this table
Assessed Status Miles
Assessed 15,568.9
Unassessed 55,825.1
Total Miles 71,394.0







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Attainment Status Miles
Good 6,227.3
Threatened .0
Impaired 9,341.6
Total Miles Assessed 15,568.9







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TMDL Development Status Miles
All TMDLs completed 419.4
TMDL alternative .0
Non-pollutant impairment 499.9
TMDL needed 8,422.4
Total Threatened and Impaired 9,341.6

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Illinois Rivers and Streams 2008

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aquatic Life 15,313.9 61.1 .0 38.9 color.gifcolor.gif
Fish Consumption 3,826.6 .0 .0 100.0 color.gif
Indigenous Aquatic Life 85.2 38.2 .0 61.8 color.gifcolor.gif
Primary Contact Recreation 3,915.3 18.9 .0 81.1 color.gifcolor.gif
Public And Food Processing Water Supplies 1,107.7 9.0 .0 91.0 color.gifcolor.gif
Secondary Contact 740.2 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Illinois Rivers and Streams 2008

Description of this table
Cause of Impairment Cause of Impairment Group Miles
Threatened or
Impaired
Fecal Coliform Pathogens color.gif 3,175.0
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 3,079.0
Mercury Mercury color.gif 2,940.5
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 2,821.0
Alteration in Stream-Side or Littoral Vegetative Covers Habitat Alterations color.gif 2,261.2
Sedimentation/Siltation Sediment color.gif 2,259.3
Phosphorus, Total Nutrients color.gif 2,091.8
Manganese Metals (other than Mercury) color.gif 1,885.1
Total Suspended Solids (TSS) Turbidity color.gif 1,579.7
Cause Unknown Cause Unknown color.gif 1,325.2
pH pH/Acidity/Caustic Conditions color.gif 892.3
Other Flow Regime Alterations Flow Alteration(s) color.gif 745.2
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 445.4
Aquatic Algae Algal Growth color.gif 418.5
Changes in Stream Depth and Velocity Patterns Habitat Alterations color.gif 351.5
Chloride Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 318.1
Loss of Instream Cover Habitat Alterations color.gif 273.8
Iron Metals (other than Mercury) color.gif 239.9
Atrazine Pesticides color.gif 209.5
DDT Pesticides color.gif 187.3
Hexachlorobenzene Pesticides color.gif 186.9
Fish Kill(s) Cause Unknown - Fish Kills color.gif 171.1
Silver Metals (other than Mercury) color.gif 153.4
Aquatic Plants (Macrophytes) Noxious Aquatic Plants color.gif 139.2
Dioxin (Including 2,3,7,8-TCDD) Dioxins color.gif 130.1
Cadmium Metals (other than Mercury) color.gif 114.2
Aldrin Pesticides color.gif 101.5
Methoxychlor Pesticides color.gif 93.0
Chlordane Pesticides color.gif 90.2
Nitrogen, Nitrate Nutrients color.gif 83.5
Fish Passage Barrier Habitat Alterations color.gif 83.3
Zinc Metals (other than Mercury) color.gif 78.7
Phenols Toxic Organics color.gif 59.3
Boron Toxic Inorganics color.gif 46.3
Nickel Metals (other than Mercury) color.gif 44.9
Ammonia, Total Ammonia color.gif 38.6
Barium Radiation color.gif 35.1
Copper Metals (other than Mercury) color.gif 34.2
Endrin Pesticides color.gif 33.2
Oil and Grease Oil and Grease color.gif 30.6
Heptachlor Pesticides color.gif 28.6
Fluoride Toxic Inorganics color.gif 27.0
Non-Native Fish/Shellfish/Zooplankton Nuisance Exotic Species color.gif 25.4
Lindane Pesticides color.gif 21.3
Dieldrin Pesticides color.gif 20.3
Chlorine Chlorine color.gif 13.6
Chromium, Total Metals (other than Mercury) color.gif 10.1
Arsenic Metals (other than Mercury) color.gif 9.6
Ammonia, Un-ionized Ammonia color.gif 8.5
Alpha-BHC Pesticides color.gif 6.5
Cyanide Toxic Inorganics color.gif 4.1
Temperature, Water Temperature color.gif 3.3
Lead Metals (other than Mercury) color.gif 2.9

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Site-specific Targeted Monitoring Results

Probable Sources
Illinois Rivers and Streams 2008

Description of this table
Probable Source Probable Source Group Miles
Threatened or
Impaired
Source Unknown Unknown color.gif 6,331.2
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 2,908.4
Crop Production (Crop Land Or Dry Land) Agriculture color.gif 2,626.1
Channelization Hydromodification color.gif 1,998.5
Municipal Point Source Discharges Municipal Discharges/Sewage color.gif 1,437.1
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 1,176.0
Surface Mining Resource Extraction color.gif 683.7
Impacts From Hydrostructure Flow Regulation/Modification Hydromodification color.gif 674.8
Streambank Modifications/Destabilization Hydromodification color.gif 652.3
Animal Feeding Operations (Nps) Agriculture color.gif 634.1
Natural Sources Natural/Wildlife color.gif 460.4
Agriculture Agriculture color.gif 416.7
Contaminated Sediments Legacy/Historical Pollutants color.gif 388.5
Loss Of Riparian Habitat Habitat Alterations (Not Directly Related To Hydromodification) color.gif 367.3
Combined Sewer Overflows Municipal Discharges/Sewage color.gif 308.4
Dam Or Impoundment Hydromodification color.gif 246.5
Habitat Modification - Other Than Hydromodification Habitat Alterations (Not Directly Related To Hydromodification) color.gif 241.9
Site Clearance (Land Development Or Redevelopment) Construction color.gif 210.1
Livestock (Grazing Or Feeding Operations) Agriculture color.gif 204.6
Upstream Impoundments (E.G., Pl-566 Nrcs Structures) Hydromodification color.gif 180.3
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 172.7
Petroleum/Natural Gas Activities Resource Extraction color.gif 170.5
Industrial Point Source Discharge Industrial color.gif 128.4
Highway/Road/Bridge Runoff (Non-Construction Related) Urban-Related Runoff/Stormwater color.gif 118.3
Runoff From Forest/Grassland/Parkland Other color.gif 106.8
Non-Irrigated Crop Production Agriculture color.gif 81.2
Acid Mine Drainage Resource Extraction color.gif 78.8
Sanitary Sewer Overflows (Collection System Failures) Municipal Discharges/Sewage color.gif 65.2
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 60.4
Dam Construction (Other Than Upstream Flood Control Projects) Hydromodification color.gif 57.2
Other Recreational Pollution Sources Recreation And Tourism (Non-Boating) color.gif 55.7
Mine Tailings Resource Extraction color.gif 47.8
Irrigated Crop Production Agriculture color.gif 29.0
Golf Courses Recreation And Tourism (Non-Boating) color.gif 19.6
Unpermitted Discharge (Domestic Wastes) Municipal Discharges/Sewage color.gif 17.6
Other Spill Related Impacts Spills/Dumping color.gif 14.7
Lake Fertilization Other color.gif 13.5
Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) Municipal Discharges/Sewage color.gif 13.3
Drainage/Filling/Loss Of Wetlands Habitat Alterations (Not Directly Related To Hydromodification) color.gif 11.4
Highways, Roads, Bridges, Infrastructure (New Construction) Construction color.gif 10.2
Coal Mining (Subsurface) Resource Extraction color.gif 7.5
Dredging (E.G., For Navigation Channels) Hydromodification color.gif 4.4
Industrial Land Treatment Industrial color.gif 3.6
Managed Pasture Grazing Agriculture color.gif 2.5

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Site-specific Targeted Monitoring Results

Illinois Lakes, Reservoirs, and Ponds 2008

Description of this table
Assessed Status Acres
Assessed 147,361.2
Unassessed 171,115.8
Total Acres 318,477.0







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Attainment Status Acres
Good 5,586.1
Threatened .0
Impaired 141,775.2
Total Acres Assessed 147,361.2







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TMDL Development Status Acres
All TMDLs completed 2,015.0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 139,760.2
Total Threatened and Impaired 141,775.2

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Illinois Lakes, Reservoirs, and Ponds 2008

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Acres Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aesthetic Quality 141,941.4 6.8 .0 93.2 color.gifcolor.gif
Aquatic Life 141,941.4 69.4 .0 30.6 color.gifcolor.gif
Fish Consumption 86,878.9 7.9 .0 92.1 color.gifcolor.gif
Indigenous Aquatic Life 1,600.0 100.0 .0 .0 color.gif
Primary Contact Recreation 1,813.9 60.2 .0 39.8 color.gifcolor.gif
Public And Food Processing Water Supplies 76,603.7 6.3 .0 93.7 color.gifcolor.gif
Secondary Contact 1,092.4 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Illinois Lakes, Reservoirs, and Ponds 2008

Description of this table
Cause of Impairment Cause of Impairment Group Acres
Threatened or
Impaired
Phosphorus, Total Nutrients color.gif 109,077.6
Aquatic Algae Algal Growth color.gif 106,680.4
Total Suspended Solids (TSS) Turbidity color.gif 105,390.3
Mercury Mercury color.gif 71,588.8
Manganese Metals (other than Mercury) color.gif 67,185.3
Aquatic Plants (Macrophytes) Noxious Aquatic Plants color.gif 26,991.7
Atrazine Pesticides color.gif 26,976.6
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 25,817.2
Cause Unknown Cause Unknown color.gif 17,127.5
Sedimentation/Siltation Sediment color.gif 13,925.0
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 12,221.4
Silver Metals (other than Mercury) color.gif 7,266.4
Non-Native Fish/Shellfish/Zooplankton Nuisance Exotic Species color.gif 6,258.6
pH pH/Acidity/Caustic Conditions color.gif 5,117.0
Chlordane Pesticides color.gif 4,820.0
Nitrogen, Nitrate Nutrients color.gif 4,585.0
Aldrin Pesticides color.gif 3,869.0
Zinc Metals (other than Mercury) color.gif 2,631.0
Heptachlor Pesticides color.gif 2,107.0
Ammonia, Total Ammonia color.gif 1,700.0
Non-Native Aquatic Plants Nuisance Exotic Species color.gif 1,631.1
Fecal Coliform Pathogens color.gif 721.5
Cadmium Metals (other than Mercury) color.gif 524.0
Nickel Metals (other than Mercury) color.gif 325.4
Total Dissolved Solids (TDS) Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 250.0
Turbidity Turbidity color.gif 172.0

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Site-specific Targeted Monitoring Results

Probable Sources
Illinois Lakes, Reservoirs, and Ponds 2008

Description of this table
Probable Source Probable Source Group Acres
Threatened or
Impaired
Crop Production (Crop Land Or Dry Land) Agriculture color.gif 116,316.8
Source Unknown Unknown color.gif 110,504.5
Littoral/Shore Area Modifications (Non-Riverine) Habitat Alterations (Not Directly Related To Hydromodification) color.gif 90,322.4
Other Recreational Pollution Sources Recreation And Tourism (Non-Boating) color.gif 77,122.8
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 71,588.8
Runoff From Forest/Grassland/Parkland Other color.gif 49,887.5
Contaminated Sediments Legacy/Historical Pollutants color.gif 46,794.9
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 40,997.6
Municipal Point Source Discharges Municipal Discharges/Sewage color.gif 25,053.1
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 12,031.0
Rcra Hazardous Waste Sites Industrial color.gif 9,156.0
Impacts From Hydrostructure Flow Regulation/Modification Hydromodification color.gif 9,113.6
Industrial Point Source Discharge Industrial color.gif 8,086.1
Site Clearance (Land Development Or Redevelopment) Construction color.gif 7,057.2
Dredging (E.G., For Navigation Channels) Hydromodification color.gif 5,965.6
Waterfowl Natural/Wildlife color.gif 4,298.3
Introduction Of Non-Native Organisms (Accidental Or Intentional) Other color.gif 2,194.7
Agriculture Agriculture color.gif 2,091.5
Rural (Residential Areas) Other color.gif 1,699.8
Livestock (Grazing Or Feeding Operations) Agriculture color.gif 1,283.0
Pesticide Application Land Application/Waste Sites/Tanks color.gif 1,090.1
Highway/Road/Bridge Runoff (Non-Construction Related) Urban-Related Runoff/Stormwater color.gif 665.0
Streambank Modifications/Destabilization Hydromodification color.gif 407.0
Residential Districts Urban-Related Runoff/Stormwater color.gif 259.6
Combined Sewer Overflows Municipal Discharges/Sewage color.gif 250.0
Impacts From Abandoned Mine Lands (Inactive) Resource Extraction color.gif 250.0
Lake Fertilization Other color.gif 248.0
Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) Municipal Discharges/Sewage color.gif 225.0
Golf Courses Recreation And Tourism (Non-Boating) color.gif 201.0
Landfills Land Application/Waste Sites/Tanks color.gif 172.0
Wildlife Other Than Waterfowl Natural/Wildlife color.gif 148.3
Highways, Roads, Bridges, Infrastructure (New Construction) Construction color.gif 135.0
Channelization Hydromodification color.gif 135.0
Impervious Surface/Parking Lot Runoff Urban-Related Runoff/Stormwater color.gif 96.3
Pollutants From Public Bathing Areas Recreation And Tourism (Non-Boating) color.gif 96.0
Specialty Crop Production Agriculture color.gif 71.3
Loss Of Riparian Habitat Habitat Alterations (Not Directly Related To Hydromodification) color.gif 58.8
Other Spill Related Impacts Spills/Dumping color.gif 40.0
Other Marina/Boating On-Vessel Discharges Recreational Boating And Marinas color.gif 23.0
Yard Maintenance Urban-Related Runoff/Stormwater color.gif 14.3
Permitted Silvicultural Activities Silviculture (Forestry) color.gif 10.7
Upstream Impoundments (E.G., Pl-566 Nrcs Structures) Hydromodification color.gif 3.7

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Site-specific Targeted Monitoring Results

Illinois Bays and Estuaries 2008

Description of this table
Assessed Status Square Miles
Assessed 2.5
Unassessed .0
Total Square Miles 2.5







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Attainment Status Square Miles
Good .0
Threatened .0
Impaired 2.5
Total Square Miles Assessed 2.5







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TMDL Development Status Square Miles
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 2.5
Total Threatened and Impaired 2.5

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Illinois Bays and Estuaries 2008

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Square Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aquatic Life 2.5 97.6 .0 2.4 color.gifcolor.gif
Fish Consumption 2.5 .0 .0 100.0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Illinois Bays and Estuaries 2008

Description of this table
Cause of Impairment Cause of Impairment Group Square Miles
Threatened or
Impaired
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 2.5
Mercury Mercury color.gif 2.5
Chromium, Total Metals (other than Mercury) color.gif .1
Zinc Metals (other than Mercury) color.gif .1
Cadmium Metals (other than Mercury) color.gif .1
Lead Metals (other than Mercury) color.gif .1
Copper Metals (other than Mercury) color.gif .1
Arsenic Metals (other than Mercury) color.gif .1
Phosphorus, Total Nutrients color.gif .1

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Site-specific Targeted Monitoring Results

Probable Sources
Illinois Bays and Estuaries 2008

Description of this table
Probable Source Probable Source Group Square Miles
Threatened or
Impaired
Source Unknown Unknown color.gif 2.5
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 2.5
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif .1
Industrial Point Source Discharge Industrial color.gif .1
Contaminated Sediments Legacy/Historical Pollutants color.gif .1

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Site-specific Targeted Monitoring Results

Illinois Great Lakes Shoreline 2008

Description of this table
Assessed Status Miles
Assessed 63.0
Unassessed .0
Total Miles 63.0







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Attainment Status Miles
Good .0
Threatened .0
Impaired 63.0
Total Miles Assessed 63.0







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TMDL Development Status Miles
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 63.0
Total Threatened and Impaired 63.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Illinois Great Lakes Shoreline 2008

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Fish Consumption 63.0 .0 .0 100.0 color.gif
Primary Contact Recreation 63.0 .0 .0 100.0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Illinois Great Lakes Shoreline 2008

Description of this table
Cause of Impairment Cause of Impairment Group Miles
Threatened or
Impaired
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 63.0
Escherichia Coli (E. Coli) Pathogens color.gif 63.0
Mercury Mercury color.gif 63.0

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Site-specific Targeted Monitoring Results

Probable Sources
Illinois Great Lakes Shoreline 2008

Description of this table
Probable Source Probable Source Group Miles
Threatened or
Impaired
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 63.0
Source Unknown Unknown color.gif 63.0
Combined Sewer Overflows Municipal Discharges/Sewage color.gif 2.0
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 2.0

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Site-specific Targeted Monitoring Results

Illinois Great Lakes Open Water 2008

Description of this table
Assessed Status Square Miles
Assessed 151.3
Unassessed 1,374.7
Total Square Miles 1,526.0







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Attainment Status Square Miles
Good .0
Threatened .0
Impaired 151.3
Total Square Miles Assessed 151.3







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TMDL Development Status Square Miles
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 151.3
Total Threatened and Impaired 151.3

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Illinois Great Lakes Open Water 2008

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Square Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aquatic Life 151.3 100.0 .0 .0 color.gif
Fish Consumption 151.3 .0 .0 100.0 color.gif
Primary Contact Recreation 151.3 100.0 .0 .0 color.gif
Public And Food Processing Water Supplies 151.3 100.0 .0 .0 color.gif
Secondary Contact 151.3 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Illinois Great Lakes Open Water 2008

Description of this table
Cause of Impairment Cause of Impairment Group Square Miles
Threatened or
Impaired
Mercury Mercury color.gif 151.3
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 151.3

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Site-specific Targeted Monitoring Results

Probable Sources
Illinois Great Lakes Open Water 2008

Description of this table
Probable Source Probable Source Group Square Miles
Threatened or
Impaired
Source Unknown Unknown color.gif 151.3
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 151.3

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Illinois Causes of Impairment for Reporting Year 2008


Description of this table
NOTE: Click on the underlined Cause of Impairment Group to see a list of specific state causes of impairment making up the Cause of Impairment Group. See also Pollution categories summary document (PDF) (20 pp, 557K, About PDF) for brief, non-technical descriptions of general cause categories.
Cause of Impairment Group Size of Assessed Waters with Listed Causes of Impairment
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)		 Great Lakes
Shoreline
(Miles)		 Great Lakes
Open Water
(Square Miles)
Algal Growth 418.5 106,680.4
Ammonia 47.2 1,700.0
Cause Unknown 1,325.2 17,127.5
Cause Unknown - Fish Kills 171.1
Chlorine 13.6
Dioxins 130.1
Flow Alteration(s) 745.2
Habitat Alterations 2,432.8
Mercury 2,940.5 71,588.8 2.5 63.0 151.3
Metals (other than Mercury) 2,189.8 76,558.7 .1
Noxious Aquatic Plants 139.2 26,991.7
Nuisance Exotic Species 25.4 6,266.3
Nutrients 2,148.5 109,077.6 .1
Oil and Grease 30.6
Organic Enrichment/Oxygen Depletion 3,079.0 12,221.4
Pathogens 3,175.0 721.5 63.0
Pesticides 702.1 37,772.6
pH/Acidity/Caustic Conditions 892.3 5,117.0
Polychlorinated Biphenyls (PCBs) 2,821.0 25,817.2 2.5 63.0 151.3
Radiation 35.1
Salinity/Total Dissolved Solids/Chlorides/Sulfates 759.3 250.0
Sediment 2,259.3 13,925.0
Temperature 3.3
Toxic Inorganics 73.3
Toxic Organics 59.3
Turbidity 1,579.7 105,390.3

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Illinois Probable Sources Contributing to Impairments
for Reporting Year 2008

Description of this table
NOTE: Click on the underlined Probable Source Group to see a list of specific state Probable Sources making up the Probable Source Group.
Probable Source Group Size of Assessed Waters with Probable Sources of Impairments
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)		 Great Lakes
Shoreline
(Miles)		 Great Lakes
Open Water
(Square Miles)
Agriculture 3,045.2 118,475.9
Atmospheric Deposition 2,908.4 71,588.8 2.5 63.0 151.3
Construction 210.1 7,192.2
Habitat Alterations (Not Directly Related To Hydromodification) 620.6 90,322.4
Hydromodification 2,904.6 15,489.9
Industrial 132.0 17,242.1 .1
Land Application/Waste Sites/Tanks 1,262.1
Legacy/Historical Pollutants 388.5 46,794.9 .1
Municipal Discharges/Sewage 1,508.0 37,559.1 2.0
Natural/Wildlife 460.4 4,438.3
Other 106.8 53,103.3
Recreation And Tourism (Non-Boating) 58.5 77,247.8
Recreational Boating And Marinas 23.0
Resource Extraction 882.8 250.0
Silviculture (Forestry) 10.7
Spills/Dumping 14.7 40.0
Unknown 6,331.2 110,504.5 2.5 63.0 151.3
Urban-Related Runoff/Stormwater 1,176.0 41,734.9 .1 2.0

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Illinois TMDL Alternatives by Cause of Impairment 2008


No TMDL Alternatives reported.

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