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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

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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 the Status of Available Data for more information.

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You are here: EPA Home Water WATERS Water Quality Assessment and TMDL Information National

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 Waters 3,533,205 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 Streams Lakes, Reservoirs, and Ponds Bays 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 PM
Assessed 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

Assessed

Percent

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 PM
Description 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 PM
Agriculture

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 PM
Unassessed 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

Assessed

Percent

Good

Percent

Threatened

Percent

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 PM
Fish Consumption Advisory 488,727

Salinity/Total Dissolved Solids/Chlorides/Sulfates 481,020

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 PM
Spills/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

Assessed

Percent

Good

Percent

Threatened

Percent

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 PM
Agricultural 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 PM
Salinity/Total Dissolved Solids/Chlorides/Sulfates 5

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 PM
Assessed 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

Assessed

Percent

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 PM
Description 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

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Aquaculture 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

Assessed

Percent

Good

Percent

Threatened

Percent

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

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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

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Assessed 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

Assessed

Percent

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 PM
Cause 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/Sulfates 11,363

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

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Other 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

Assessed

Percent

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

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Industrial 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

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Natural/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

Assessed

Percent

Good

Percent

Threatened

Percent

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

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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

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Metals (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

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Industrial 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

2003 4 7

2004 159 204

2005 107 228

2006 85 101

2007 233 396

2008

339

416

2009

318

487

2010 302 372

2011 160 190

2012 10 11

Impaired Waters Listed By State

Description of this table

State Name Number of Waters on 303(d) List

Alabama 209

Alaska 35

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American Samoa 44

Arizona 84

Arkansas 224

California 691

Colorado 244

Connecticut 425

Delaware 101

District Of Columbia 36

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 Islands 24

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

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Rhode 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

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Other 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 Plants 21 22

Radiation 19 22

Oil and Grease 14 14

Cause Unknown 7 7

Fish Consumption

Advisory 2 2

Nuisance Exotic Species 2 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

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Kansas 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.

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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

1996 122 123

1997 337 351

1998 402 408

1999 330 373

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

2008

9,245

9,529

2009 4,400 4,626

2010 2,561 2,699

2011 3,093 3,392

2012 172 211

Total: 46,797 TMDLs; 49,518 Causes of Impairment Addressed

Status of Available Data Used in This Report

Description of this table

State Name Assessed Waters Report Year Impaired 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

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Kentucky 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

TMDL Document Search

Full Text Search of TMDL Documents

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