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On This Page Assessment Summary Water Quality by Waterbody Type Rivers and Streams Lakes, Reservoirs, and Ponds Bays and Estuaries Coastal Shoreline Ocean and Near Coastal Wetlands Great Lakes Shoreline Great Lakes Open Water Causes of Impairment Probable Sources Contributing to Impairments Previously Impaired Waters Now Attaining All Uses Impaired Waters Listed by State Cumulative TMDLs by Pollutant Approved TMDLs by State Cumulative Number of TMDLs Status of Available Data Used in This Report For More Information:

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## National Summary of State Information

Depicted below are national summary tables and charts for available water quality data reported by the States to EPA under Section 305(b) and 303(d) of the Clean Water Act. This report displays the most current available reporting year data. Check theStatus of Available Data for more information.Frequent Questions About This Database (Integrated Report) About This Database (Separate Impaired and Assessed Waters Reports) Assessing Water Quality (Questions and Answers) Integrated Reporting Guidance Previous National Water Quality Reports EnviroMapper for Water AskWATERS EPA WATERS Homepage Exchange Network Assessment Database Statewide Statistical Surveys Draft statistical survey web report Demo of statistical survey template (mpeg4, 101MB zipped) You are here:EPA HomeWaterWATERSWater Quality Assessment and TMDL InformationNational Summary of State Information 

## Watershed Assessment, Tracking & Environmental ResultS http://iaspub.epa.gov/waters10/attains_nation_cy.control

Last updated on Tuesday, January 03, 2012 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

1 of 28 1/3/2012 4:58 PM

### Assessed Waters of United States

Incomplete state reported information may lead to discrepancies and/or missing information in these reports. Description of this table

Size of Water

Rivers and Streams (Miles) Lakes,

Reservoirs, and Ponds (Acres)Bays and

Estuaries (Square Miles)Coastal

Shoreline (Miles)Ocean

and Near Coastal (Square Miles)Wetlands

(Acres) Great

Lakes Shoreline (Miles)Great

Lakes Open Water (Square Miles) Good Waters 450,237 5,865,983 11,045 1,746 968 208,944 78 62 Threatened Waters 6,369 38,681 17 805 Impaired Waters 514,647 13,121,823 21,768 7,396 307 1,101,895 4,353 53,270

Total Assessed Waters 971,253 19,026,487 32,830 9,143 1,275 1,311,645 4,431 53,332 Total Waters3,533,205 41,666,049 87,791 58,618 54,120 107,700,000 5,202 60,546 Percent of Waters Assessed 27.5 45.7 37.4 15.6 2.4 1.2 85.2 88.1 

### States Using a Statewide Statistical Survey Some states submit statewide statistical survey data, which use representative random samples to characterize the condition of an entire waterbody type. Statewide statistical survey data is not currently included in these summary tables.

Number of States Rivers and StreamsLakes, Reservoirs, and PondsBays and Estuaries

7 4 2 

## Summary of Water Quality Assessments for Each Waterbody Type National Summary Water Quality Attainment in Assessed Rivers and Streams Description of this table Description of this table 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

2 of 28 1/3/2012 4:58 PMAssessed Status Miles

Assessed 971,253 Unassessed 2,561,952 Total Miles 3,533,205 Attainment Status Good 450,237 Threatened Impaired 514,647 Total Miles Assessed 971,253 

### National Summary Designated Use Support in Assessed Rivers and Streams* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Miles AssessedPercent

Good Percent

Threatened Percent

Impaired% Good

% Threatened % Impaired Fish, Shellfish, And Wildlife Protection And Propagation 761,870 55.0 .5 44.5

Recreation 390,618 55.2 1.4 43.4 Agricultural 352,153 93.6 .6 5.8 Aquatic Life Harvesting 264,805 35.2 .3 64.5 Industrial 210,353 93.3 .0 6.7 Public Water Supply 187,837 73.9 .8 25.2 Other 104,648 80.7 .2 19.1

Aesthetic Value 26,064 89.0 .0 11.0 Exceptional Recreational Or Ecological Significance 14,663 11.3 4.4 84.4 

### National Summary Causes of Impairment in Assessed Rivers and Streams National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

3 of 28 1/3/2012 4:58 PMDescription of this table Cause of Impairment Group Miles Threatened or Impaired Pathogens 157,966 Sediment 106,008 Nutrients 101,896 Organic Enrichment/Oxygen Depletion 87,571 Polychlorinated Biphenyls (PCBs) 76,242 Habitat Alterations 75,402 Metals (other than Mercury) 72,245 Mercury 60,085 Flow Alteration(s) 50,437 Temperature 50,138 Cause Unknown 38,907 Cause Unknown - Impaired Biota 37,783 Salinity/Total Dissolved Solids/Chlorides/Sulfates 32,858 pH/Acidity/Caustic Conditions 29,459 Turbidity 28,260 Pesticides 17,127 Other Cause 17,082 Ammonia 12,758 Fish Consumption Advisory 10,029 Algal Growth 7,444 Total Toxics 7,226 Toxic Inorganics 6,825 Toxic Organics 4,827 Dioxins 4,318 Oil and Grease 2,740 Cause Unknown - Fish Kills 1,376 Nuisance Exotic Species 1,236 Taste, Color and Odor 928 Radiation 652 Chlorine 629 Trash 238 Noxious Aquatic Plants 208 Nuisance Native Species 127 Biotoxins 84 

### National Summary Probable Sources of Impairments in Assessed Rivers and Streams Description of this table Probable Source Group Miles Threatened or Impaired 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

4 of 28 1/3/2012 4:58 PMAgriculture 124,282 Atmospheric Deposition 98,107 Unknown 86,761 Hydromodification 58,879 Urban-Related Runoff/Stormwater 51,725 Natural/Wildlife 51,582 Municipal Discharges/Sewage 51,236 Unspecified Nonpoint Source 46,985 Habitat Alterations (Not Directly Related To Hydromodification) 32,387 Resource Extraction 26,356 Silviculture (Forestry) 19,444 Industrial 14,433 Construction 13,532 Other 10,167 Land Application/Waste Sites/Tanks 8,394 Legacy/Historical Pollutants 4,915 Spills/Dumping 2,420 Recreation And Tourism (Non-Boating) 1,741 Aquaculture 318 Groundwater Loadings/Withdrawals 178 Recreational Boating And Marinas 132 Military Bases 42 

### National Summary Water Quality Attainment in Assessed Lakes, Reservoirs, and Ponds Description of this table

Assessed Status Acres Assessed 19,026,487 Description of this table

Attainment Status 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

5 of 28 1/3/2012 4:58 PMUnassessed 22,639,562

Total Acres 41,666,049 Good 5,865,983 Threatened 38,681 Impaired 13,121,823 Total Acres Assessed 19,026,487 

### National Summary Designated Use Support in Assessed Lakes, Reservoirs, and Ponds* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Acres AssessedPercent

Good Percent

ThreatenedPercent

Impaired% Good

% Threatened % Impaired Aquatic Life Harvesting 10,846,763 25.7 .5 73.8 Fish, Shellfish, And Wildlife Protection And Propagation 10,797,032 54.8 .3 44.9

Recreation 9,115,700 74.8 2.3 22.9 Public Water Supply 7,166,998 76.7 .6 22.8 Agricultural 5,428,705 90.6 .7 8.7

Industrial 4,480,479 89.3 .1 10.6 Other 3,234,122 69.2 .3 30.5 Aesthetic Value 1,287,680 49.4 .0 50.6 Exceptional Recreational Or Ecological Significance 732,768 16.1 15.6 68.3 

### National Summary Causes of Impairment in Assessed Lakes, Reservoirs, and Ponds Description of this table Cause of Impairment Group Acres Threatened or Impaired Mercury 7,385,751 Nutrients 3,565,586 Polychlorinated Biphenyls (PCBs) 2,835,870 Organic Enrichment/Oxygen Depletion 1,752,069 Metals (other than Mercury) 1,521,332 Turbidity 1,457,161 Algal Growth 1,220,358 pH/Acidity/Caustic Conditions 886,936 Sediment 737,741 Nuisance Exotic Species 682,491 Flow Alteration(s) 548,980 Pathogens 544,163 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

6 of 28 1/3/2012 4:58 PMFish Consumption Advisory 488,727 Salinity/Total Dissolved Solids/Chlorides/Sulfates481,020 Habitat Alterations 443,402 Pesticides 351,265 Nuisance Native Species 272,318 Other Cause 270,437 Ammonia 210,475 Temperature 202,660 Taste, Color and Odor 147,143 Dioxins 119,568 Toxic Organics 94,686 Cause Unknown - Impaired Biota 58,062 Cause Unknown 54,841 Radiation 48,312 Noxious Aquatic Plants 45,727 Total Toxics 23,556 Biotoxins 17,258 Toxic Inorganics 8,035 Cause Unknown - Fish Kills 6,457 Trash 1,717 Oil and Grease 1,274 

### National Summary Probable Sources of Impairments in Assessed Lakes, Reservoirs, and Ponds Description of this table Probable Source Group Acres Threatened or Impaired Atmospheric Deposition 4,740,142 Unknown 3,258,186 Agriculture 1,817,549 Natural/Wildlife 1,374,576 Hydromodification 905,925 Other 863,640 Urban-Related Runoff/Stormwater 856,530 Municipal Discharges/Sewage 794,158 Legacy/Historical Pollutants 763,320 Unspecified Nonpoint Source 759,087 Resource Extraction 560,919 Habitat Alterations (Not Directly Related To Hydromodification) 359,237 Construction 314,515 Silviculture (Forestry) 242,583 Industrial 221,830 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

7 of 28 1/3/2012 4:58 PMSpills/Dumping 194,422 Recreational Boating And Marinas 126,390 Commercial Harbor And Port Activities 109,240 Recreation And Tourism (Non-Boating) 106,703 Groundwater Loadings/Withdrawals 98,032 Land Application/Waste Sites/Tanks 77,005 Aquaculture 4,620 Military Bases 2,436 

### National Summary Water Quality Attainment in Assessed Bays and Estuaries Description of this table

Assessed Status Square Miles Assessed 32,830 Unassessed 54,961 Total Square Miles 87,791 Description of this table

Attainment Status Square Miles Good 11,045 Threatened Impaired 21,768 Total Square Miles Assessed 32,830 

### National Summary Designated Use Support in Assessed Bays and Estuaries* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Square Miles AssessedPercent

Good Percent

ThreatenedPercent

Impaired% Good

% Threatened % Impaired Aquatic Life Harvesting 24,475 31.5 .1 68.5 Fish, Shellfish, And Wildlife Protection And Propagation 19,398 52.1 .1 47.8

Recreation 13,989 94.1 .0 5.9 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

8 of 28 1/3/2012 4:58 PMAgricultural 3,976 96.3 .0 3.7

Industrial 3,766 96.1 .0 3.9 Other 3,437 92.5 .0 7.5 Exceptional Recreational Or Ecological Significance 533 .8 .0 99.2 Public Water Supply 328 47.8 .0 52.2

Aesthetic Value 114 86.6 .0 13.4 

### National Summary Causes of Impairment in Assessed Bays and Estuaries Description of this table Cause of Impairment Group Square Miles Threatened or Impaired Mercury 10,420 Pathogens 6,573 Polychlorinated Biphenyls (PCBs) 6,475 Organic Enrichment/Oxygen Depletion 5,209 Dioxins 3,896 Metals (other than Mercury) 1,975 Noxious Aquatic Plants 1,855 Pesticides 1,770 Algal Growth 1,412 Cause Unknown - Impaired Biota 1,160 Toxic Organics 925 Nutrients 882 Other Cause 782 Turbidity 378 Total Toxics 316 Flow Alteration(s) 299 Habitat Alterations 262 Sediment 199 Nuisance Exotic Species 92 pH/Acidity/Caustic Conditions 92 Cause Unknown 53 Temperature 35 Trash 31 Ammonia 31 Oil and Grease 16 Toxic Inorganics 6 Taste, Color and Odor 6 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

9 of 28 1/3/2012 4:58 PMSalinity/Total Dissolved Solids/Chlorides/Sulfates5 

### National Summary Probable Sources of Impairments in Assessed Bays and Estuaries Description of this table Probable Source Group Square Miles Threatened or Impaired Atmospheric Deposition 7,721 Unknown 5,439 Municipal Discharges/Sewage 4,406 Natural/Wildlife 4,225 Industrial 3,752 Other 3,630 Agriculture 3,020 Unspecified Nonpoint Source 2,607 Hydromodification 2,513 Habitat Alterations (Not Directly Related To Hydromodification) 2,057 Urban-Related Runoff/Stormwater 1,869 Legacy/Historical Pollutants 1,469 Resource Extraction 1,292 Recreational Boating And Marinas 1,053 Commercial Harbor And Port Activities 470 Groundwater Loadings/Withdrawals 158 Land Application/Waste Sites/Tanks 52 Spills/Dumping 26 Construction 16 Land Application/Waste Sites 1 Recreation And Tourism (Non-Boating) 0 Silviculture (Forestry) 0 Aquaculture 0 

### National Summary Water Quality Attainment in Assessed Coastal Shoreline Description of this table Description of this table 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

10 of 28 1/3/2012 4:58 PMAssessed Status Miles

Assessed 9,143 Unassessed 49,475 Total Miles 58,618 Attainment Status Good Threatened Impaired Total Miles Assessed 

### National Summary Designated Use Support in Assessed Coastal Shoreline* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Miles AssessedPercent

Good Percent

Threatened Percent

Impaired% Good

% Threatened % Impaired Aquatic Life Harvesting 8,160 14.6 .0 85.4

Recreation 2,316 79.8 .0 20.2 Fish, Shellfish, And Wildlife Protection And Propagation 1,649 69.3 .0 30.7

Other 808 62.2 .0 37.8 Exceptional Recreational Or Ecological Significance 328 80.1 .0 19.9

Industrial 308 78.2 .0 21.8

Aesthetic Value 235 100.0 .0 .0 Agricultural 50 .0 .0 100.0 Public Water Supply 49 .0 .0 100.0 

### National Summary Causes of Impairment in Assessed Coastal Shoreline National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

11 of 28 1/3/2012 4:58 PMDescription of this table Cause of Impairment Group Miles Threatened or Impaired Mercury 6,606 Pathogens 1,114 Organic Enrichment/Oxygen Depletion 556 Metals (other than Mercury) 214 Pesticides 204 Polychlorinated Biphenyls (PCBs) 167 Turbidity 129 Nutrients 123 Algal Growth 91 Cause Unknown - Impaired Biota 70 pH/Acidity/Caustic Conditions 69 Other Cause 65 Ammonia 21 Temperature 20 Toxic Organics 13 Oil and Grease 13 Sediment 5 

### National Summary Probable Sources of Impairments in Assessed Coastal Shoreline Description of this table Probable Source Group Miles Threatened or Impaired Unknown 554 Atmospheric Deposition 521 Urban-Related Runoff/Stormwater 384 Municipal Discharges/Sewage 348 Agriculture 142 Hydromodification 136 Industrial 127 Unspecified Nonpoint Source 120 Natural/Wildlife 100 Recreational Boating And Marinas 36 Other 34 Construction 23 Commercial Harbor And Port Activities 20 Recreation And Tourism (Non-Boating) 20 Spills/Dumping 13 Land Application/Waste Sites/Tanks 12 Resource Extraction 12 Legacy/Historical Pollutants 8 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

12 of 28 1/3/2012 4:58 PMAquaculture 5 

### National Summary Water Quality Attainment in Assessed Ocean and Near Coastal Description of this table

Assessed Status Square Miles Assessed 1,275 Unassessed 52,845 Total Square Miles 54,120 Description of this table

Attainment Status Square Miles Good Threatened Impaired Total Square Miles Assessed 

### National Summary Designated Use Support in Assessed Ocean and Near Coastal* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Square Miles AssessedPercent

Good Percent

ThreatenedPercent

Impaired% Good

% Threatened % Impaired Recreation 828 96.2 .0 3.8 Fish, Shellfish, And Wildlife Protection And Propagation 821 95.4 .0 4.6

Aquatic Life Harvesting 561 86.7 .0 13.3

Other 476 57.8 .0 42.2 Public Water Supply 154 100.0 .0 .0 Exceptional Recreational Or Ecological Significance 99 100.0 .0 .0

Industrial 3 100.0 .0 .0 

### National Summary National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

13 of 28 1/3/2012 4:58 PM

### Causes of Impairment in Assessed Ocean and Near Coastal Description of this table Cause of Impairment Group Square Miles Threatened or Impaired Mercury 87 Pathogens 80 Organic Enrichment/Oxygen Depletion 71 Nuisance Exotic Species 35 Total Toxics 29 Polychlorinated Biphenyls (PCBs) 23 Turbidity 22 Pesticides 17 Metals (other than Mercury) 15 Toxic Organics 14 Habitat Alterations 10 Dioxins 9 Nutrients 7 pH/Acidity/Caustic Conditions 7 Temperature 1 Ammonia 1 

### National Summary Probable Sources of Impairments in Assessed Ocean and Near Coastal Description of this table Probable Source Group Square Miles Threatened or Impaired Unknown 72 Atmospheric Deposition 68 Recreational Boating And Marinas 9 Municipal Discharges/Sewage 7 Unspecified Nonpoint Source 7 Urban-Related Runoff/Stormwater 6 Recreation And Tourism (Non-Boating) 4 Industrial 4 Hydromodification 4 Construction 3 Spills/Dumping 2 Natural/Wildlife 1 Commercial Harbor And Port Activities 0 

### National Summary Water Quality Attainment in Assessed Wetlands Description of this table Description of this table 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

14 of 28 1/3/2012 4:58 PMAssessed Status Acres

Assessed 1,311,645 Unassessed 106,388,355 Total Acres 107,700,000 Attainment Status Good 208,944 Threatened Impaired 1,101,895 Total Acres Assessed 1,311,645 

### National Summary Designated Use Support in Assessed Wetlands* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Acres AssessedPercent

Good Percent

Threatened Percent

Impaired% Good

% Threatened % Impaired Fish, Shellfish, And Wildlife Protection And Propagation 1,303,897 15.7 .1 84.3

Recreation 1,138,460 51.6 5.9 42.5 Public Water Supply 546,411 87.8 .0 12.2 Exceptional Recreational Or Ecological Significance 141,544 8.3 44.6 47.2 Aquatic Life Harvesting 91,675 .4 .0 99.6 Industrial 85,235 25.7 .0 74.3

Other 67,123 1.1 .0 98.9 Agricultural 33,176 49.0 .6 50.4 

### National Summary Causes of Impairment in Assessed Wetlands

Description of this table 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

15 of 28 1/3/2012 4:58 PMCause of Impairment Group Acres Threatened or Impaired Organic Enrichment/Oxygen Depletion 926,402 Pathogens 476,087 Mercury 225,786 Metals (other than Mercury) 166,952 Habitat Alterations 107,432 Nutrients 68,410 Flow Alteration(s) 32,260 Toxic Inorganics 21,473 Total Toxics 12,659 Sediment 11,405 Salinity/Total Dissolved Solids/Chlorides/Sulfates11,363 Temperature 7,680 Turbidity 4,089 Algal Growth 3,891 pH/Acidity/Caustic Conditions 3,683 Nuisance Exotic Species 2,988 Cause Unknown - Impaired Biota 1,263 Cause Unknown 1,000 Fish Consumption Advisory 1,000 Cause Unknown - Fish Kills 997 Noxious Aquatic Plants 940 Polychlorinated Biphenyls (PCBs) 707 Other Cause 678 Trash 458 Pesticides 362 Toxic Organics 133 Radiation 2 

### National Summary Probable Sources of Impairments in Assessed Wetlands Description of this table Probable Source Group Acres Threatened or Impaired Unknown 681,927 Natural/Wildlife 587,203 Municipal Discharges/Sewage 464,479 Agriculture 369,637 Atmospheric Deposition 200,741 Industrial 195,840 Hydromodification 109,024 Resource Extraction 89,353 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

16 of 28 1/3/2012 4:58 PMOther 65,874 Unspecified Nonpoint Source 63,901 Construction 13,971 Habitat Alterations (Not Directly Related To Hydromodification) 8,017 Groundwater Loadings/Withdrawals 3,045 Land Application/Waste Sites/Tanks 1,634 Recreation And Tourism (Non-Boating) 787 Urban-Related Runoff/Stormwater 2 Silviculture (Forestry) 2 

### National Summary Water Quality Attainment in Assessed Great Lakes Shoreline Description of this table

Assessed Status Miles Assessed 4,431 Unassessed 772 Total Miles 5,202 Description of this table

Attainment Status Good Threatened Impaired Total Miles Assessed 

### National Summary Designated Use Support in Assessed Great Lakes Shoreline* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Miles AssessedPercent

Good Percent

Threatened Percent

Impaired% Good

% Threatened % Impaired Aquatic Life Harvesting 4,064 .0 .0 100.0 Agricultural 3,131 100.0 .0 .0 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

17 of 28 1/3/2012 4:58 PMIndustrial 3,131 100.0 .0 .0

Other 3,131 100.0 .0 .0 Fish, Shellfish, And Wildlife Protection And Propagation 865 33.1 .0 66.9

Recreation 816 32.2 .0 67.8 Public Water Supply 336 100.0 .0 .0 

### National Summary Causes of Impairment in Assessed Great Lakes Shoreline Description of this table Cause of Impairment Group Miles Threatened or Impaired Polychlorinated Biphenyls (PCBs) 3,472 Dioxins 2,963 Mercury 2,131 Pesticides 1,975 Pathogens 492 Nutrients 315 Nuisance Exotic Species 290 Sediment 290 Fish Consumption Advisory 285 Habitat Alterations 170 Other Cause 152 Organic Enrichment/Oxygen Depletion 120 Algal Growth 25 Toxic Inorganics 5 

### National Summary Probable Sources of Impairments in Assessed Great Lakes Shoreline Description of this table Probable Source Group Miles Threatened or Impaired Atmospheric Deposition 3,337 Agriculture 536 Legacy/Historical Pollutants 427 Unknown 141 Municipal Discharges/Sewage 120 Land Application/Waste Sites/Tanks 31 Industrial 31 Unspecified Nonpoint Source 8 Hydromodification 7 Urban-Related Runoff/Stormwater 2 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

18 of 28 1/3/2012 4:58 PMNatural/Wildlife 0 

### National Summary Water Quality Attainment in Assessed Great Lakes Open Water Description of this table

Assessed Status Square Miles Assessed 53,332 Unassessed 7,214 Total Square Miles 60,546 Description of this table

Attainment Status Square Miles Good Threatened Impaired 53,270 Total Square Miles Assessed 53,332 

### National Summary Designated Use Support in Assessed Great Lakes Open Water* * Waters assessed for more than one designated use are included in multiple designated use groups below. Description of this table Designated Use Group Square Miles AssessedPercent

Good Percent

ThreatenedPercent

Impaired% Good

% Threatened % Impaired Aquatic Life Harvesting 39,184 .0 .0 100.0 Agricultural 39,031 100.0 .0 .0 Industrial 39,031 100.0 .0 .0

Other 39,031 100.0 .0 .0 Fish, Shellfish, And Wildlife Protection And Propagation 14,300 1.5 .0 98.5

Public Water Supply 151 100.0 .0 .0

Recreation 151 100.0 .0 .0 

### National Summary National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

19 of 28 1/3/2012 4:58 PM

### Causes of Impairment in Assessed Great Lakes Open Water Description of this table Cause of Impairment Group Square Miles Threatened or Impaired Polychlorinated Biphenyls (PCBs) 39,183 Dioxins 38,862 Mercury 29,816 Pesticides 29,661 Fish Consumption Advisory 14,087 Organic Enrichment/Oxygen Depletion 13,867 Total Toxics 192 Nuisance Exotic Species 25 

### National Summary Probable Sources of Impairments in Assessed Great Lakes Open Water Description of this table Probable Source Group Square Miles Threatened or Impaired Atmospheric Deposition 53,118 Legacy/Historical Pollutants 13,991 Urban-Related Runoff/Stormwater 13,867 Agriculture 4,373 Unknown 310 Other 25



### National Causes of Impairment

Description of this table NOTE:Click on a cause of impairment (e.g. algal growth) to see the specific state-reported causes that are grouped to make up this category.

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)Coastal

Shoreline (Miles)Ocean

and Near Coastal (Square Miles)Wetlands

(Acres)Great

Lakes Shoreline (Miles)Great

Lakes Open Water (Square Miles) Algal Growth 7,444 1,220,358 1,412 91 3,891 25 Ammonia 12,758 210,475 31 21 1 Biotoxins 84 17,258 Cause Unknown 38,907 54,841 53 1,000 Cause Unknown - Fish Kills 1,376 6,457 997 Cause Unknown - Impaired Biota 37,783 58,062 1,160 70 1,263 Chlorine 629 Dioxins 4,318 119,568 3,896 9 2,963 38,862 Fish Consumption Advisory 10,029 488,727 0 1,000 285 14,087 Flow Alteration(s) 50,437 548,980 299 32,260 Habitat Alterations 75,402 443,402 262 10 107,432 170 Mercury 60,085 7,385,751 10,420 6,606 87 225,786 2,131 29,816 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

20 of 28 1/3/2012 4:58 PMMetals (other than

Mercury) 72,245 1,521,332 1,975 214 15 166,952 Noxious Aquatic Plants 208 45,727 1,855 940 Nuisance Exotic Species 1,236 682,491 92 35 2,988 290 25 Nuisance Native Species 127 272,318 Nutrients 101,896 3,565,586 882 123 7 68,410 315 Oil and Grease 2,740 1,274 16 13 Organic Enrichment/Oxygen Depletion 87,571 1,752,069 5,209 556 71 926,402 120 13,867 Other Cause 17,082 270,437 782 65 678 152 Pathogens 157,966 544,163 6,573 1,114 80 476,087 492 Pesticides 17,127 351,265 1,770 204 17 362 1,975 29,661 pH/Acidity/Caustic Conditions 29,459 886,936 92 69 7 3,683 Polychlorinated Biphenyls (PCBs) 76,242 2,835,870 6,475 167 23 707 3,472 39,183 Radiation 652 48,312 2 Salinity/Total Dissolved Solids/Chlorides /Sulfates 32,858 481,020 5 11,363 Sediment 106,008 737,741 199 5 11,405 290 Taste, Color and Odor 928 147,143 6 Temperature 50,138 202,660 35 20 1 7,680 Total Toxics 7,226 23,556 316 29 12,659 192 Toxic Inorganics 6,825 8,035 6 21,473 5 Toxic Organics 4,827 94,686 925 13 14 133 Trash 238 1,717 31 458 Turbidity 28,260 1,457,161 378 129 22 4,089



### National Probable Sources Contributing to Impairments Description of this table NOTE:Click on a source of impairment (e.g. agriculture) to see the specific state-reported sources that are grouped to make up this category.

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)Coastal

Shoreline (Miles)Ocean

and Near Coastal (Square Miles)Wetlands

(Acres)Great

Lakes Shoreline (Miles)Great

Lakes Open Water (Square Miles) Agriculture 124,282 1,817,549 3,020 142 369,637 536 4,373 Aquaculture 318 4,620 0 5 Atmospheric Deposition 98,107 4,740,142 7,721 521 68 200,741 3,337 53,118 Commercial Harbor And Port Activities 109,240 470 20 0 Construction 13,532 314,515 16 23 3 13,971 Groundwater Loadings/Withdrawals 178 98,032 158 3,045 Habitat Alterations (Not Directly Related To Hydromodification)32,387 359,237 2,057 8,017 Hydromodification 58,879 905,925 2,513 136 4 109,024 7 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

21 of 28 1/3/2012 4:58 PMIndustrial 14,433 221,830 3,752 127 4 195,840 31

Land Application/Waste Sites 1 Land Application/Waste Sites/Tanks 8,394 77,005 52 12 1,634 31 Legacy/Historical Pollutants 4,915 763,320 1,469 8 427 13,991 Military Bases 42 2,436 Municipal Discharges/Sewage 51,236 794,158 4,406 348 7 464,479 120 Natural/Wildlife 51,582 1,374,576 4,225 100 1 587,203 0 Other 10,167 863,640 3,630 34 65,874 25 Recreation And Tourism (Non-Boating)1,741 106,703 0 20 4 787 Recreational Boating And Marinas 132 126,390 1,053 36 9 Resource Extraction 26,356 560,919 1,292 12 89,353 Silviculture (Forestry) 19,444 242,583 0 2 Spills/Dumping 2,420 194,422 26 13 2 Unknown 86,761 3,258,186 5,439 554 72 681,927 141 310 Unspecified Nonpoint Source 46,985 759,087 2,607 120 7 63,901 8 Urban-Related Runoff/Stormwater 51,725 856,530 1,869 384 6 2 2 13,867



### National Previously Impaired Waters Now Attaining All Uses Description of this table NOTE:Click on the underlined "Number of Waters Attaining" value for a detailed list of those waters now attaining all uses. Cycle Attaining Number of Waters Attaining Number of Causes of Impairment Addressed 2002 23 24 20034 7 2004 159 204 2005 107 228 2006 85 101 2007 233 396 2008339 416

2009318 487 2010 302 372 2011 160 190 201210 11



### Impaired Waters Listed By State

Description of this table State Name Number of Waters on 303(d) List Alabama 209 Alaska 35 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

22 of 28 1/3/2012 4:58 PMAmerican Samoa44 Arizona 84 Arkansas 224 California 691 Colorado 244 Connecticut 425 Delaware 101 District Of Columbia36 Florida 2,292 Georgia 215 Guam 47 Hawaii 309 Idaho 915 Illinois 1,057 Indiana 1,836 Iowa 474 Kansas 1,387 Kentucky 1,300 Louisiana 250 Maine 114 Maryland 184 Massachusetts 837 Michigan 2,352 Minnesota 1,144 Mississippi 180 Missouri 245 Montana 604 N. Mariana Islands24 Nebraska 260 Nevada 181 New Hampshire 1,449 New Jersey 745 New Mexico 196 New York 528 North Carolina 1,270 North Dakota 214 Ohio 267 Oklahoma 743 Oregon 1,397 Pennsylvania 6,957 Puerto Rico 165 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

23 of 28 1/3/2012 4:58 PMRhode Island 162 South Carolina 961 South Dakota 159 Tennessee 1,028 Texas 651 Utah 118 Vermont 134 Virgin Islands 87 Virginia 1,523 Washington 2,419 West Virginia 1,097 Wisconsin 593 Wyoming 111 Total: 41,274 impaired waters



### National Cumulative TMDLs by Pollutant This chart includes TMDLs since October 1, 1995.

Description of this table NOTE:Click on the underlined "Pollutant Group" value to see a detailed list of pollutants. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant Group. Pollutant Group Number of TMDLs Number of Causes of Impairment Addressed Pathogens 10,126 10,392 Metals (other than Mercury) 7,998 8,173 Mercury 6,970 7,002 Nutrients 5,246 6,253 Sediment 3,865 4,442 Temperature 1,988 1,997 Organic Enrichment/Oxygen Depletion 1,943 2,051 pH/Acidity/Caustic Conditions 1,801 1,841 Salinity/Total Dissolved Solids/Chlorides /Sulfates 1,564 1,619 Turbidity 1,309 1,524 Ammonia 1,084 1,147 Pesticides 1,051 1,148 Polychlorinated Biphenyls (PCBs) 425 446 Chlorine 335 341 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

24 of 28 1/3/2012 4:58 PMOther Cause 217 238 Toxic Inorganics 193 193 Toxic Organics 135 136 Cause Unknown - Impaired Biota 133 137 Total Toxics 102 110 Habitat Alterations 83 84 Algal Growth 69 75 Trash 68 72 Dioxins 27 28 Noxious Aquatic Plants21 22 Radiation 19 22 Oil and Grease 14 14 Cause Unknown 7 7 Fish Consumption Advisory 2 2 Nuisance Exotic Species2 2 Total: 46,797 TMDLs; 49,518 Causes of Impairment Addressed



### Approved TMDLs By State This chart includes TMDLs since October 1, 1995.

Description of this table NOTE:Click on the state name to see a state report. Click on the Number of TMDLs to see a detailed list of the TMDLs.State Name Number of TMDLs Alabama 282 Alaska 52 American Samoa 2 Arizona 82 Arkansas 250 California 1,189 Colorado 992 Connecticut 143 Delaware 576 District Of Columbia 372 Florida 790 Georgia 1,637 Guam 18 Hawaii 56 Idaho 1,794 Illinois 324 Indiana 959 Iowa 170 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

25 of 28 1/3/2012 4:58 PMKansas 2,870

Kentucky 234 Louisiana 708 Maine 301 Maryland 812 Massachusetts 485 Michigan 193 Minnesota 1,329 Mississippi 1,427 Missouri 287 Montana 808 Nebraska 92 Nevada 64 New Hampshire 6,004 New Jersey 616 New Mexico 302 New York 659 North Carolina 208 North Dakota 107 Ohio 1,471 Oklahoma 496 Oregon 1,228 Pennsylvania 7,282 Puerto Rico 223 Rhode Island 176 South Carolina 463 South Dakota 313 Tennessee 1,152 Texas 209 Utah 307 Vermont 117 Virgin Islands 66 Virginia 1,350 Washington 1,353 West Virginia 2,845 Wisconsin 199 Wyoming 353 Total: 46,797 TMDLs



### National Cumulative Number of TMDLs EPA Fiscal Year starts October 1 and ends September 30. 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

26 of 28 1/3/2012 4:58 PMDescription 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 1996122 123 1997337 351 1998402 408 1999330 373 2000 1,556 1,581 2001 2,581 2,617 2002 2,738 2,821 2003 3,007 3,282 2004 3,383 3,639 2005 4,318 4,637 2006 4,215 4,564 2007 4,337 4,665 20089,245 9,529 2009 4,400 4,626 2010 2,561 2,699 2011 3,093 3,392 2012172 211 Total: 46,797 TMDLs; 49,518 Causes of Impairment Addressed 

### Status of Available Data Used in This Report

Description of this table State NameAssessed Waters Report YearImpaired Waters Report Year Alabama 2010 2010 Alaska 2010 2010 American Samoa 2010 2010 Arizona 2008 2008 Arkansas 2008 2008 California 2004 2006 Colorado 2010 2010 Connecticut 2010 2010 Delaware 2006 2006 District Of Columbia 2010 2010 Florida 2010 2010 Georgia 2010 2010 Guam 2010 2010 Hawaii 2006 2006 Idaho 2010 2010 Illinois 2006 2006 Indiana 2010 2008 Iowa 2010 2010 Kansas 2008 2010 

### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

27 of 28 1/3/2012 4:58 PMKentucky 2010 2010 Louisiana 2010 2006 Maine 2010 2010 Maryland 2002 2010 Massachusetts 2010 2006 Michigan 2010 2008 Minnesota 2010 2008 Mississippi 2010 2010 Missouri 2010 2010 Montana 2010 2010 N. Mariana Islands 2010 2010 Nebraska 2010 2010 Nevada 2006 2006 New Hampshire 2010 2010 New Jersey 2010 2008 New Mexico 2010 2010 New York 2010 2010 North Carolina 2010 2010 North Dakota 2010 2010 Ohio 2010 2008 Oklahoma 2010 2008 Oregon 2006 2006 Pennsylvania 2006 2004 Puerto Rico 2010 2010 Rhode Island 2010 2010 South Carolina 2010 2010 South Dakota 2010 2010 Tennessee 2010 2010 Texas 2010 2008 Utah 2010 2006 Vermont 2008 2008 Virgin Islands 2010 2010 Virginia 2010 2010 Washington 2008 2008 West Virginia 2010 2010 Wisconsin 2006 2006 Wyoming 2010 2010

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### National Summary of State Information | WATERS | US EPA http://iaspub.epa.gov/waters10/attains_nation_cy.control

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