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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

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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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Summary of State Information

Watershed Assessment, Tracking & Environmental ResultS

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Last updated on 6/11/2013
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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 455,628 5,854,182 11,072 1,215 541 197,205 78 62

Threatened

Waters

5,198 19,862

Impaired

Waters

517,190 12,006,715 21,587 7,206 1,057 922,311 4,353 53,270

Total Assessed

Waters

978,016 17,880,759 32,659 8,421 1,598 1,119,515 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

27.7 42.9 37.2 14.4 3.0 1.0 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 as Acres Number of Lakes Bays and Estuaries

10 5 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
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Assessed Status Miles

Assessed 978,016

Unassessed 2,555,189

Total Miles 3,533,205

Attainment Status Miles

Good 455,628

Threatened 5,198

Impaired 517,190

Total Miles Assessed 978,016

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

761,035 55.5 .4 44.1

Recreation 387,185 56.8 1.0 42.1

Agricultural 352,845 95.4 .2 4.5

Aquatic Life Harvesting 254,742 36.2 .1 63.7

Industrial 197,877 97.8 .0 2.2

Public Water Supply 196,978 77.5 .1 22.5

Other 85,231 97.9 .0 2.1

Aesthetic Value 26,213 88.9 .0 11.1

Exceptional Recreational Or

Ecological Significance

2,478 72.6 .0 27.4
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National Summary

Causes of Impairment in Assessed Rivers and Streams

Description of this table

Cause of Impairment Group

Miles

Threatened or

Impaired

Pathogens 157,682

Sediment 125,164

Nutrients 98,381

Organic Enrichment/Oxygen Depletion 84,771

Polychlorinated Biphenyls (PCBs) 78,257

Metals (other than Mercury) 75,784

Temperature 67,223

Mercury 63,740

Habitat Alterations 62,373

Flow Alteration(s) 40,739

Cause Unknown 39,187

Cause Unknown - Impaired Biota 39,003

Salinity/Total Dissolved Solids/Chlorides/Sulfates 34,259

Turbidity 29,275

pH/Acidity/Caustic Conditions 28,578

Pesticides 16,819

Other Cause 11,950

Ammonia 11,778

Fish Consumption Advisory 9,948

Total Toxics 8,999

Toxic Inorganics 7,879

Algal Growth 5,945

Toxic Organics 4,474

Dioxins 4,321

Oil and Grease 2,874

Biotoxins 2,150

Nuisance Exotic Species 1,406

Cause Unknown - Fish Kills 1,371

Taste, Color and Odor 871

Trash 751

Radiation 630

Chlorine 618

Noxious Aquatic Plants 295

Nuisance Native Species 127

National Summary

Probable Sources of Impairments in Assessed Rivers and Streams
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Description of this table

Probable Source Group

Miles

Threatened or

Impaired

Agriculture

124,177

Atmospheric Deposition

101,283

Unknown 99,012

Hydromodification 57,760

Urban-Related Runoff/Stormwater 55,956

Municipal Discharges/Sewage 53,662

Natural/Wildlife 53,170

Unspecified Nonpoint Source 48,282

Habitat Alterations (Not Directly Related To

Hydromodification)

33,211

Resource Extraction 29,096

Silviculture (Forestry) 19,760

Industrial 16,158

Construction 12,576

Other 8,889

Land Application/Waste Sites/Tanks 7,917

Legacy/Historical Pollutants 4,908

Spills/Dumping 2,818

Recreation And Tourism (Non-Boating) 1,613

Aquaculture 318

Groundwater Loadings/Withdrawals 270

Recreational Boating And Marinas 132

Military Bases 42

National Summary

Water Quality Attainment in Assessed Lakes, Reservoirs, and Ponds

Description of this table Description of this table
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Assessed Status Acres

Assessed 17,880,759

Unassessed 23,785,290

Total Acres 41,666,049

Attainment Status Acres

Good 5,854,182

Threatened 19,862

Impaired 12,006,715

Total Acres Assessed 17,880,759

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 10,096,743 25.5 .0 74.5

Fish, Shellfish, And Wildlife

Protection And Propagation

9,646,501 58.7 .1 41.2

Recreation 8,143,251 86.0 .2 13.8

Public Water Supply 6,382,193 81.7 .0 18.3

Agricultural 4,898,635 95.8 .0 4.2

Industrial 3,304,709 99.9 .0 .1

Other 2,520,363 87.4 .0 12.6

Aesthetic Value 1,201,350 52.9 .0 47.1

National Summary

Causes of Impairment in Assessed Lakes, Reservoirs, and Ponds

Description of this table

Acres
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Cause of Impairment Group Threatened or

Impaired

Mercury 7,452,118

Nutrients 3,055,444

Polychlorinated Biphenyls (PCBs) 2,839,921

Organic Enrichment/Oxygen Depletion 1,607,785

Turbidity 1,372,482

Metals (other than Mercury) 964,674

Algal Growth 892,475

pH/Acidity/Caustic Conditions 886,947

Sediment 717,578

Nuisance Exotic Species 679,042

Fish Consumption Advisory 501,212

Salinity/Total Dissolved Solids/Chlorides/Sulfates 456,484

Habitat Alterations 288,060

Pathogens 271,917

Other Cause 269,946

Pesticides 260,342

Ammonia 210,141

Temperature 205,815

Flow Alteration(s) 181,857

Taste, Color and Odor 147,152

Dioxins 119,568

Cause Unknown 102,688

Cause Unknown - Impaired Biota 58,062

Noxious Aquatic Plants 45,665

Nuisance Native Species 27,318

Biotoxins 17,261

Total Toxics 12,571

Cause Unknown - Fish Kills 6,457

Toxic Organics 5,806

Toxic Inorganics 4,355

Trash 1,718

Oil and Grease 1,321

Radiation 48

National Summary

Probable Sources of Impairments in Assessed Lakes, Reservoirs, and Ponds

Description of this table

Probable Source Group

Acres

Threatened or

Impaired
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Atmospheric Deposition 4,809,011

Unknown 3,201,602

Agriculture 849,373

Legacy/Historical Pollutants 772,959

Natural/Wildlife 701,159

Other 657,612

Municipal Discharges/Sewage 633,710

Unspecified Nonpoint Source 576,935

Hydromodification 572,545

Urban-Related Runoff/Stormwater 525,519

Resource Extraction 386,642

Construction 209,169

Industrial 203,180

Spills/Dumping 194,455

Silviculture (Forestry) 135,251

Habitat Alterations (Not Directly Related To

Hydromodification)

124,515

Recreation And Tourism (Non-Boating) 99,369

Land Application/Waste Sites/Tanks 44,259

Commercial Harbor And Port Activities 23,046

Recreational Boating And Marinas 18,351

Aquaculture 4,620

Military Bases 2,436

Groundwater Loadings/Withdrawals 235

National Summary

Water Quality Attainment in Assessed Bays and Estuaries

Description of this table

Assessed Status Square Miles

Description of this table
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Assessed 32,659

Unassessed 55,131

Total Square Miles 87,791

Attainment Status Square Miles

Good 11,072

Threatened 0

Impaired 21,587

Total Square Miles Assessed 32,659

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 23,453 33.1 .0 66.9

Fish, Shellfish, And Wildlife

Protection And Propagation

19,398 52.1 .0 47.9

Recreation 13,536 88.6 .0 11.4

Agricultural 3,786 96.7 .0 3.3

Industrial 3,225 100.0 .0 .0

Other 3,203 98.9 .0 1.1

Public Water Supply 175 89.5 .0 10.5

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 10,809

Polychlorinated Biphenyls (PCBs) 7,291

Pathogens 6,551

Organic Enrichment/Oxygen Depletion 5,204

Dioxins 4,418

Noxious Aquatic Plants 1,855

Pesticides 1,766

Metals (other than Mercury) 1,590

Algal Growth 1,412

Cause Unknown - Impaired Biota 1,165

Nutrients 880

Other Cause 777
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Nuisance Exotic Species 656

Turbidity 380

Total Toxics 332

Trash 288

Fish Consumption Advisory 230

Sediment 223

pH/Acidity/Caustic Conditions 95

Toxic Organics 78

Cause Unknown 40

Salinity/Total Dissolved Solids/Chlorides/Sulfates 38

Temperature 35

Ammonia 31

Oil and Grease 16

Toxic Inorganics 6

Taste, Color and Odor 6

Habitat Alterations 0

Flow Alteration(s) 0

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

8,026

Unknown 5,825

Municipal Discharges/Sewage 4,846

Industrial 4,240

Natural/Wildlife 3,996

Other 3,779

Unspecified Nonpoint Source 2,832

Agriculture 2,547

Urban-Related Runoff/Stormwater 2,189

Habitat Alterations (Not Directly Related To

Hydromodification)

2,057

Hydromodification 1,939

Legacy/Historical Pollutants 1,476

Resource Extraction 1,290

Recreational Boating And Marinas 1,028

Commercial Harbor And Port Activities 495

Spills/Dumping 283

Land Application/Waste Sites/Tanks 11
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Construction 4

Recreation And Tourism (Non-Boating) 3

Land Application/Waste Sites 1

Groundwater Loadings/Withdrawals 0

Silviculture (Forestry) 0

Aquaculture 0

National Summary

Water Quality Attainment in Assessed Coastal Shoreline

Description of this table

Assessed Status Miles

Assessed 8,421

Unassessed 50,197

Total Miles 58,618

Description of this table

Attainment Status Miles

Good 1,215

Threatened 0

Impaired 7,206

Total Miles Assessed 8,421

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 7,399 9.0 .0 91.0

Recreation 1,663 76.1 .0 23.9

Fish, Shellfish, And Wildlife

Protection And Propagation

815 68.2 .0 31.8

Aesthetic Value 235 100.0 .0 .0
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Other 87 .0 .0 100.0

Industrial 30 83.3 .0 16.7

National Summary

Causes of Impairment in Assessed Coastal Shoreline

Description of this table

Cause of Impairment Group

Miles

Threatened or

Impaired

Mercury 6,473

Pathogens 1,085

Organic Enrichment/Oxygen Depletion 423

Turbidity 129

Nutrients 123

Algal Growth 91

Polychlorinated Biphenyls (PCBs) 76

Cause Unknown - Impaired Biota 70

pH/Acidity/Caustic Conditions 69

Metals (other than Mercury) 62

Other Cause 45

Pesticides 44

Ammonia 21

Temperature 20

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 469

Atmospheric Deposition 388

Municipal Discharges/Sewage 327

Urban-Related Runoff/Stormwater 271

Hydromodification 136

Unspecified Nonpoint Source 135

Industrial 126

Agriculture 126

Recreational Boating And Marinas 35

Construction 20

Spills/Dumping 13

Land Application/Waste Sites/Tanks 11
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Legacy/Historical Pollutants 8

Aquaculture 5

Natural/Wildlife 1

Recreation And Tourism (Non-Boating) 0

Resource Extraction 0

National Summary

Water Quality Attainment in Assessed Ocean and Near Coastal

Description of this table Description of this table
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Assessed Status Square Miles

Assessed 1,598

Unassessed 52,522

Total Square Miles 54,120

Attainment Status Square Miles

Good 541

Threatened 0

Impaired 1,057

Total Square Miles Assessed 1,598

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 1,050 97.0 .0 3.0

Aquatic Life Harvesting 888 7.0 .0 93.0

Fish, Shellfish, And Wildlife

Protection And Propagation

840 35.1 .0 64.9

Other 376 46.7 .0 53.3

Agricultural 201 100.0 .0 .0

National Summary

Causes of Impairment in Assessed Ocean and Near Coastal

Description of this table

Cause of Impairment Group

Square Miles

Threatened or

Impaired

Mercury 796

Organic Enrichment/Oxygen Depletion 579

Pesticides 567

Polychlorinated Biphenyls (PCBs) 531

Pathogens 80

Nuisance Exotic Species 35

Total Toxics 29

Turbidity 22

Metals (other than Mercury) 15

Toxic Organics 14

Habitat Alterations 10

9
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Dioxins

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

Atmospheric Deposition 777

Unknown 602

Urban-Related Runoff/Stormwater 452

Municipal Discharges/Sewage 116

Recreational Boating And Marinas 9

Unspecified Nonpoint Source 7

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

Assessed Status Acres

Assessed 1,119,515

Description of this table

Attainment Status Acres
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Unassessed 106,580,485

Total Acres 107,700,000

Good 197,205

Threatened 0

Impaired 922,311

Total Acres Assessed 1,119,515

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

1,112,731 17.3 .0 82.7

Recreation 1,048,237 54.9 .0 45.1

Public Water Supply 480,401 99.8 .0 .2

Aquatic Life Harvesting 33,495 .5 .0 99.5

Agricultural 19,037 85.4 .0 14.6

Industrial 19,032 100.0 .0 .0

Other 719 100.0 .0 .0

National Summary

Causes of Impairment in Assessed Wetlands

Description of this table

Cause of Impairment Group

Acres

Threatened or

Impaired

Organic Enrichment/Oxygen Depletion 860,167

Pathogens 464,029

Mercury 231,260

Metals (other than Mercury) 28,823

Toxic Inorganics 28,053

Sediment 11,405

Salinity/Total Dissolved Solids/Chlorides/Sulfates 8,634

Temperature 7,680

Flow Alteration(s) 4,417

Turbidity 4,089

Algal Growth 3,891

Nuisance Exotic Species 2,989

Nutrients 1,873

Habitat Alterations 1,754
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Cause Unknown - Impaired Biota 1,263

Cause Unknown 1,000

Fish Consumption Advisory 1,000

Cause Unknown - Fish Kills 997

Noxious Aquatic Plants 940

pH/Acidity/Caustic Conditions 838

Polychlorinated Biphenyls (PCBs) 707

Other Cause 678

Trash 458

Toxic Organics 0

Pesticides 0

Ammonia 0

Total Toxics 0

National Summary

Probable Sources of Impairments in Assessed Wetlands

Description of this table

Probable Source Group

Acres

Threatened or

Impaired

Unknown

707,599

Natural/Wildlife 472,619

Municipal Discharges/Sewage 464,479

Atmospheric Deposition 200,741

Agriculture 199,062

Industrial 195,840

Resource Extraction 32,215

Hydromodification 14,947

Habitat Alterations (Not Directly Related To

Hydromodification)

7,680

Land Application/Waste Sites/Tanks 1,138

Unspecified Nonpoint Source 1,098

Construction 1,000

Other 237

Urban-Related Runoff/Stormwater 104

National Summary

Water Quality Attainment in Assessed Great Lakes Shoreline

Description of this table Description of this table
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Assessed Status Miles

Assessed 4,431

Unassessed 772

Total Miles 5,202

Attainment Status Miles

Good 78

Threatened 0

Impaired 4,353

Total Miles Assessed 4,431

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
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% Impaired

Aquatic Life Harvesting 4,064 .0 .0 100.0

Agricultural 3,131 100.0 .0 .0

Other 3,131 100.0 .0 .0

Industrial 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 2,194

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 3,400

Agriculture 536

Legacy/Historical Pollutants 427

Unknown 141

Municipal Discharges/Sewage 120
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Land Application/Waste Sites/Tanks 31

Industrial 31

Unspecified Nonpoint Source 8

Hydromodification 7

Urban-Related Runoff/Stormwater 2

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 62

Threatened 0

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

Industrial 39,031 100.0 .0 .0

Agricultural 39,031 100.0 .0 .0

Other 39,031 100.0 .0 .0

Fish, Shellfish, And Wildlife
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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

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 29,968

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 53,270

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. 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)

Coastal

Shoreline

(Miles)

Ocean

and

Near

Coastal

(Square

Miles)

Wetlands

(Acres)

Great

Lakes

Shoreline

(Miles)

Great

Lakes

Open

Water

(Square

Miles)

Algal Growth 5,945 892,475 1,412 91 3,891 25

Ammonia 11,778 210,141 31 21 1 0

Biotoxins 2,150 17,261

Cause Unknown 39,187 102,688 40 1,000
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Cause Unknown - Fish

Kills

1,371 6,457 997

Cause Unknown -

Impaired Biota

39,003 58,062 1,165 70 1,263

Chlorine 618

Dioxins 4,321 119,568 4,418 9 2,963 38,862

Fish Consumption

Advisory

9,948 501,212 230 0 1,000 285 14,087

Flow Alteration(s) 40,739 181,857 0 4,417

Habitat Alterations 62,373 288,060 0 10 1,754 170

Mercury 63,740 7,452,118 10,809 6,473 796 231,260 2,194 29,968

Metals (other than

Mercury)

75,784 964,674 1,590 62 15 28,823

Noxious Aquatic Plants 295 45,665 1,855 940

Nuisance Exotic Species 1,406 679,042 656 35 2,989 290 25

Nuisance Native Species 127 27,318

Nutrients 98,381 3,055,444 880 123 7 1,873 315

Oil and Grease 2,874 1,321 16 13

Organic

Enrichment/Oxygen

Depletion

84,771 1,607,785 5,204 423 579 860,167 120 13,867

Other Cause 11,950 269,946 777 45 678 152

Pathogens 157,682 271,917 6,551 1,085 80 464,029 492

Pesticides 16,819 260,342 1,766 44 567 0 1,975 29,661

pH/Acidity/Caustic

Conditions

28,578 886,947 95 69 7 838

Polychlorinated

Biphenyls (PCBs)

78,257 2,839,921 7,291 76 531 707 3,472 39,183

Radiation 630 48

Salinity/Total Dissolved

Solids/Chlorides/Sulfates

34,259 456,484 38 8,634

Sediment 125,164 717,578 223 5 11,405 290

Taste, Color and Odor 871 147,152 6

Temperature 67,223 205,815 35 20 1 7,680

Total Toxics 8,999 12,571 332 29 0 192

Toxic Inorganics 7,879 4,355 6 28,053 5

Toxic Organics 4,474 5,806 78 14 0

Trash 751 1,718 288 458

Turbidity 29,275 1,372,482 380 129 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 124,177 849,373 2,547 126 199,062 536 4,373

Aquaculture 318 4,620 0 5
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Atmospheric

Deposition

101,283 4,809,011 8,026 388 777 200,741 3,400 53,270

Commercial Harbor

And Port Activities

23,046 495 0

Construction 12,576 209,169 4 20 3 1,000

Groundwater

Loadings/Withdrawals

270 235 0

Habitat Alterations

(Not Directly Related

To

Hydromodification)

33,211 124,515 2,057 7,680

Hydromodification 57,760 572,545 1,939 136 4 14,947 7

Industrial 16,158 203,180 4,240 126 4 195,840 31

Land

Application/Waste

Sites

1

Land

Application/Waste

Sites/Tanks

7,917 44,259 11 11 1,138 31

Legacy/Historical

Pollutants

4,908 772,959 1,476 8 427 13,991

Military Bases 42 2,436

Municipal

Discharges/Sewage

53,662 633,710 4,846 327 116 464,479 120

Natural/Wildlife 53,170 701,159 3,996 1 1 472,619 0

Other 8,889 657,612 3,779 237 25

Recreation And

Tourism (NonBoating)1,613 99,369 3 0 4

Recreational Boating

And Marinas

132 18,351 1,028 35 9

Resource Extraction 29,096 386,642 1,290 0 32,215

Silviculture

(Forestry)

19,760 135,251 0

Spills/Dumping 2,818 194,455 283 13 2

Unknown 99,012 3,201,602 5,825 469 602 707,599 141 310

Unspecified Nonpoint

Source 48,282 576,935 2,832 135 7 1,098 8

Urban-Related

Runoff/Stormwater

55,956 525,519 2,189 271 452 104 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 107 234

2006 85 101

2007 233 399
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2008

339

421

2009 318 515

2010

344

423

2011 252 301

2012 244 359

2013 3 4

Impaired Waters Listed By State

Description of this table

State Name Number of Waters on 303(d) List

Alabama 209

Alaska 35

American Samoa 44

Arizona 79

Arkansas 225

California 1,021

Colorado 244

Connecticut 425

Delaware 101

District Of Columbia 36

Florida 2,292

Georgia 215

Guam 47

Hawaii 309

Idaho 916

Illinois 1,057

Indiana 1,836

Iowa 474

Kansas 1,330

Kentucky 1,300

Louisiana 274

Maine 114

Maryland 184

Massachusetts 710

Michigan 2,352

Minnesota 1,144

Mississippi 180

Missouri 257
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Montana 584

N. Mariana Islands 24

Nebraska 330

Nevada 181

New Hampshire 1,449

New Jersey 716

New Mexico 196

New York 528

North Carolina 1,270

North Dakota 201

Ohio 267

Oklahoma 723

Oregon 1,397

Pennsylvania 6,957

Puerto Rico

165

Rhode Island 120

South Carolina 961

South Dakota 155

Tennessee 1,028

Texas 719

Utah 156

Vermont 126

Virgin Islands 87

Virginia 1,523

Washington 2,420

West Virginia 1,097

Wisconsin 593

Wyoming 107

Total: 41,490 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
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Addressed

Pathogens

11,453

11,753

Metals (other than

Mercury)

8,873 9,069

Mercury 7,031 7,063

Nutrients 5,424 6,521

Sediment 3,768 4,383

Temperature 2,142 2,149

Organic

Enrichment/Oxygen

Depletion

1,970 2,090

pH/Acidity/Caustic

Conditions

1,837 1,877

Salinity/Total Dissolved

Solids/Chlorides/Sulfates

1,577 1,632

Turbidity 1,436 1,646

Pesticides 1,172 1,270

Ammonia 1,095 1,159

Polychlorinated Biphenyls

(PCBs)

488 510

Chlorine 335 341

Other Cause 268 323

Toxic Inorganics 200 200

Toxic Organics 158 199

Cause Unknown -

Impaired Biota

128 132

Total Toxics 103 111

Habitat Alterations 83 84

Algal Growth 72 79

Trash 72 76

Dioxins 27 28

Noxious Aquatic Plants 21 22

Radiation 19 22

Oil and Grease 14 14

Cause Unknown 7 7

Nuisance Exotic Species 3 6

Fish Consumption

Advisory

2 2

Total: 49,778 TMDLs; 52,768 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.
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State Name Number of TMDLs

Alabama 287

Alaska 53

American Samoa 2

Arizona 86

Arkansas 271

California 1,568

Colorado 988

Connecticut 325

Delaware 576

District Of Columbia 371

Florida 878

Georgia 1,662

Guam 18

Hawaii 64

Idaho 1,951

Illinois 341

Indiana 1,045

Iowa 188

Kansas 2,982

Kentucky 251

Louisiana 750

Maine 337

Maryland 767

Massachusetts 576

Michigan 238

Minnesota 1,389

Mississippi 1,430

Missouri 288

Montana 1,121

Nebraska 108

Nevada 64

New Hampshire 6,006

New Jersey 616

New Mexico 311

New York 663

North Carolina 232

North Dakota 123

Ohio 1,615

615
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Oklahoma

Oregon 1,241

Pennsylvania 7,075

Puerto Rico 321

Rhode Island 190

South Carolina 486

South Dakota 321

Tennessee 1,210

Texas 224

Utah 308

Vermont 119

Virgin Islands 66

Virginia 1,393

Washington 1,468

West Virginia 3,600

Wisconsin 247

Wyoming 353

Total: 49,778 TMDLs

National Cumulative Number of TMDLs

EPA Fiscal Year starts October 1 and ends September 30.

Description of this table

NOTE: Click on the underlined "Number of TMDLs Completed"

value for a detailed list of the TMDLs for the fiscal year.

Fiscal

Year Number of TMDLs

Number of

Causes of

Impairment

Addressed

1996 122 123

1997 337 351

1998 402 408

1999 330 373

2000 1,556 1,581

2001 2,577 2,613

2002 2,737 2,820

2003 3,002 3,278

2004 3,374 3,631

2005 4,312 4,630

2006 4,207 4,560

2007 4,321 4,650
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2008

9,264

9,547

2009 4,398 4,627

2010 2,564 2,703

2011 2,819 3,112

2012 2,880 3,154

2013 576 607

Total: 49,778 TMDLs; 52,768 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 2010 2010

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 2008 2006

Indiana 2010 2008

Iowa 2010 2010

Kansas 2012 2012

Kentucky 2010 2010

Louisiana 2010 2010

Maine 2010 2010

Maryland 2002 2010

Massachusetts 2010 2010

Michigan 2010 2008

Minnesota 2010 2008

Mississippi 2010 2010

Missouri 2012 2012

Montana 2012 2012

N. Mariana Islands 2010 2010

Nebraska 2012 2012

Nevada 2006 2006

New Hampshire 2010 2010

New Jersey 2010 2010

New Mexico 2010 2010
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New York 2010 2010

North Carolina 2010 2010

North Dakota 2012 2012

Ohio 2010 2008

Oklahoma 2010 2010

Oregon 2006 2006

Pennsylvania 2006 2004

Puerto Rico 2010 2010

Rhode Island 2012 2012

South Carolina 2010 2010

South Dakota 2010 2012

Tennessee 2010 2010

Texas 2010 2010

Utah 2010 2010

Vermont 2008 2010

Virgin Islands 2010 2010

Virginia 2010 2010

Washington 2008 2008

West Virginia 2010 2010

Wisconsin 2006 2006

Wyoming 2012 2012

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