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National Summary of State Information

Map of the United States

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.





Assessed Waters of United States

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

Description of this table
 
    477,909 5,639,165 7,300 1,154 618 573,947 78 62
    7,305 130,709            
    555,155 12,235,499 26,080 7,283 1,059 538,492 4,353 53,270
1,040,368 18,005,373 33,380 8,437 1,677 1,112,438 4,431 53,332
3,533,205 41,666,049 87,791 58,618 54,120 107,700,000 5,202 60,546
29.4 43.2 38.0 14.4 3.1 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
11 5   2  

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Summary of Water Quality Assessments for Each Waterbody Type


National Summary
Water Quality Attainment in Assessed Rivers and Streams

Description of this table

All
Rivers and Streams

3,533,205.0 Miles of Rivers and Streams

Assessed 1,040,368
Unassessed 2,492,837
Total Miles 3,533,205







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Description of this table

Assessed
Rivers and Streams

1,040,368.4 Miles of
Assessed Rivers and Streams

Good 477,909
Threatened 7,305
Impaired 555,155
Total Miles Assessed 1,040,368

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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
% Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 808,709 57.3 .6 42.1 color.gifcolor.gifcolor.gif
Recreation Recreation 426,048 59.1 1.4 39.5 color.gifcolor.gifcolor.gif
Agricultural Agricultural 354,757 95.5 .2 4.4 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 284,213 29.6 .8 69.6 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 200,775 77.8 .2 22.1 color.gifcolor.gifcolor.gif
Industrial Industrial 197,136 97.8 .0 2.2 color.gifcolor.gif
Hydropower Generation Other 84,816 97.9 .0 2.1 color.gifcolor.gif
Aesthetic Value Aesthetic Value 28,735 92.8 .0 7.2 color.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 2,483 74.9 .0 25.1 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Rivers and Streams

Description of this table
Pathogens color.gif 164,065
Sediment color.gif 120,729
Nutrients color.gif 104,102
Mercury color.gif 102,346
Organic Enrichment/Oxygen Depletion color.gif 87,915
Polychlorinated Biphenyls (PCBs) color.gif 79,632
Metals (other than Mercury) color.gif 76,526
Temperature color.gif 68,745
Habitat Alterations color.gif 63,766
Flow Alteration(s) color.gif 41,985
Cause Unknown color.gif 39,175
Cause Unknown - Impaired Biota color.gif 39,113
Turbidity color.gif 36,715
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 34,293
pH/Acidity/Caustic Conditions color.gif 29,151
Pesticides color.gif 18,893
Ammonia color.gif 12,213
Other Cause color.gif 12,020
Total Toxics color.gif 10,729
Fish Consumption Advisory color.gif 9,916
Toxic Inorganics color.gif 7,641
Algal Growth color.gif 6,069
Toxic Organics color.gif 4,982
Dioxins color.gif 4,598
Oil and Grease color.gif 3,085
Biotoxins color.gif 2,150
Nuisance Exotic Species color.gif 1,448
Trash color.gif 1,233
Taste, Color and Odor color.gif 854
Chlorine color.gif 747
Cause Unknown - Fish Kills color.gif 688
Radiation color.gif 677
Noxious Aquatic Plants color.gif 354
Nuisance Native Species color.gif 127

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National Summary
Probable Sources of Impairments in Assessed Rivers and Streams

Description of this table
Agriculture color.gif 129,795
Unknown color.gif 102,213
Atmospheric Deposition color.gif 100,181
Hydromodification color.gif 61,276
Urban-Related Runoff/Stormwater color.gif 60,011
Municipal Discharges/Sewage color.gif 57,647
Natural/Wildlife color.gif 52,611
Unspecified Nonpoint Source color.gif 48,040
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 35,172
Resource Extraction color.gif 29,064
Silviculture (Forestry) color.gif 19,719
Industrial color.gif 17,877
Construction color.gif 13,042
Other color.gif 10,022
Land Application/Waste Sites/Tanks color.gif 9,397
Legacy/Historical Pollutants color.gif 6,035
Spills/Dumping color.gif 3,305
Recreation And Tourism (Non-Boating) color.gif 1,959
Aquaculture color.gif 312
Groundwater Loadings/Withdrawals color.gif 270
Recreational Boating And Marinas color.gif 142
Commercial Harbor And Port Activities color.gif 52
Military Bases color.gif 42

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National Summary
Water Quality Attainment in Assessed Lakes, Reservoirs, and Ponds

Description of this table

All
Lakes, Reservoirs, and Ponds

41,666,049.0 Acres of Lakes, Reservoirs, and Ponds

Assessed 18,005,373
Unassessed 23,660,676
Total Acres 41,666,049







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

18,005,372.5 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 5,639,165
Threatened 130,709
Impaired 12,235,499
Total Acres Assessed 18,005,373

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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
% Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 10,206,733 58.2 1.2 40.5 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 10,184,461 24.2 1.1 74.7 color.gifcolor.gifcolor.gif
Recreation Recreation 8,262,127 85.8 1.6 12.7 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 6,275,702 79.3 1.7 19.0 color.gifcolor.gifcolor.gif
Agricultural Agricultural 5,047,942 95.6 .0 4.4 color.gifcolor.gif
Industrial Industrial 3,318,772 99.9 .0 .1 color.gifcolor.gif
Hydropower Generation Other 2,437,051 87.0 .0 13.0 color.gifcolor.gif
Aesthetic Value Aesthetic Value 1,218,629 51.8 .0 48.2 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Lakes, Reservoirs, and Ponds

Description of this table
Mercury color.gif 8,037,372
Nutrients color.gif 3,160,647
Polychlorinated Biphenyls (PCBs) color.gif 2,961,007
Turbidity color.gif 1,449,814
Organic Enrichment/Oxygen Depletion color.gif 1,399,795
Metals (other than Mercury) color.gif 983,950
pH/Acidity/Caustic Conditions color.gif 890,997
Algal Growth color.gif 886,837
Sediment color.gif 761,496
Nuisance Exotic Species color.gif 752,707
Fish Consumption Advisory color.gif 539,504
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 459,494
Habitat Alterations color.gif 319,198
Pathogens color.gif 315,694
Pesticides color.gif 258,953
Temperature color.gif 218,251
Ammonia color.gif 208,768
Other Cause color.gif 196,433
Flow Alteration(s) color.gif 187,888
Taste, Color and Odor color.gif 162,678
Dioxins color.gif 109,289
Nuisance Native Species color.gif 100,624
Noxious Aquatic Plants color.gif 79,762
Cause Unknown - Impaired Biota color.gif 57,780
Cause Unknown color.gif 39,415
Biotoxins color.gif 17,628
Total Toxics color.gif 12,834
Toxic Organics color.gif 10,044
Cause Unknown - Fish Kills color.gif 9,391
Toxic Inorganics color.gif 6,170
Trash color.gif 4,600
Chlorine color.gif 3,208
Oil and Grease color.gif 1,331
Radiation color.gif 48

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

Description of this table
Atmospheric Deposition color.gif 4,848,277
Unknown color.gif 3,142,546
Agriculture color.gif 989,524
Other color.gif 807,763
Legacy/Historical Pollutants color.gif 780,849
Natural/Wildlife color.gif 762,960
Municipal Discharges/Sewage color.gif 709,903
Urban-Related Runoff/Stormwater color.gif 681,682
Hydromodification color.gif 653,680
Unspecified Nonpoint Source color.gif 592,182
Resource Extraction color.gif 441,667
Construction color.gif 245,348
Industrial color.gif 241,431
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 191,611
Spills/Dumping color.gif 184,388
Silviculture (Forestry) color.gif 139,349
Recreation And Tourism (Non-Boating) color.gif 112,208
Land Application/Waste Sites/Tanks color.gif 55,166
Recreational Boating And Marinas color.gif 34,724
Aquaculture color.gif 4,620
Military Bases color.gif 2,639
Groundwater Loadings/Withdrawals color.gif 438

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National Summary
Water Quality Attainment in Assessed Bays and Estuaries

Description of this table

All
Bays and Estuaries

87,790.6 Square Miles of Bays and Estuaries

Assessed 33,380
Unassessed 54,411
Total Square Miles 87,791







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Description of this table

Assessed
Bays and Estuaries

33,379.7 Square Miles of
Assessed Bays and Estuaries

Good 7,300
Threatened 0
Impaired 26,080
Total Square Miles Assessed 33,380

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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
% Good
% Threatened
% Impaired
Aquatic Life Harvesting Aquatic Life Harvesting 24,209 16.4 .0 83.6 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 20,257 40.3 .0 59.7 color.gifcolor.gif
Recreation Recreation 14,788 69.7 .0 30.3 color.gifcolor.gif
Agricultural Agricultural 3,788 96.7 .0 3.3 color.gifcolor.gif
Industrial Industrial 3,225 100.0 .0 .0 color.gifcolor.gif
Hydropower Generation Other 3,203 98.9 .0 1.1 color.gifcolor.gif
Public Water Supply Public Water Supply 189 90.2 .0 9.8 color.gifcolor.gif
Aesthetic Value Aesthetic Value 67 76.6 .0 23.4 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Bays and Estuaries

Description of this table
Mercury color.gif 14,139
Polychlorinated Biphenyls (PCBs) color.gif 7,607
Pathogens color.gif 6,881
Organic Enrichment/Oxygen Depletion color.gif 5,435
Dioxins color.gif 4,351
Other Cause color.gif 3,431
Fish Consumption Advisory color.gif 3,084
Noxious Aquatic Plants color.gif 1,855
Metals (other than Mercury) color.gif 1,846
Pesticides color.gif 1,807
Algal Growth color.gif 1,638
Nutrients color.gif 1,265
Cause Unknown - Impaired Biota color.gif 1,177
Nuisance Exotic Species color.gif 763
Toxic Organics color.gif 718
Trash color.gif 434
Total Toxics color.gif 333
Turbidity color.gif 319
Sediment color.gif 224
Temperature color.gif 165
Oil and Grease color.gif 101
pH/Acidity/Caustic Conditions color.gif 80
Ammonia color.gif 48
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 44
Cause Unknown color.gif 34
Taste, Color and Odor color.gif 7
Toxic Inorganics color.gif 6
Chlorine color.gif 5
Nuisance Native Species color.gif 4
Flow Alteration(s) color.gif 3
Habitat Alterations color.gif 2

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National Summary
Probable Sources of Impairments in Assessed Bays and Estuaries

Description of this table
Atmospheric Deposition color.gif 8,372
Unknown color.gif 5,781
Municipal Discharges/Sewage color.gif 5,550
Other color.gif 4,465
Industrial color.gif 4,326
Natural/Wildlife color.gif 3,523
Urban-Related Runoff/Stormwater color.gif 3,182
Spills/Dumping color.gif 3,162
Unspecified Nonpoint Source color.gif 2,603
Agriculture color.gif 2,583
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 2,201
Hydromodification color.gif 2,065
Legacy/Historical Pollutants color.gif 1,563
Recreational Boating And Marinas color.gif 794
Resource Extraction color.gif 780
Commercial Harbor And Port Activities color.gif 495
Land Application/Waste Sites/Tanks color.gif 84
Recreation And Tourism (Non-Boating) color.gif 10
Construction color.gif 4
Land Application/Waste Sites color.gif 1
Groundwater Loadings/Withdrawals color.gif 0
Aquaculture color.gif 0
Silviculture (Forestry) color.gif 0

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National Summary
Water Quality Attainment in Assessed Coastal Shoreline

Description of this table

All
Coastal Shoreline

58,618.0 Miles of Coastal Shoreline

Assessed 8,437
Unassessed 50,181
Total Miles 58,618







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Description of this table

Assessed
Coastal Shoreline

8,437.0 Miles of
Assessed Coastal Shoreline

Good 1,154
Threatened 0
Impaired 7,283
Total Miles Assessed 8,437

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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
% Good
% Threatened
% Impaired
Aquatic Life Harvesting Aquatic Life Harvesting 7,391 9.0 .0 91.0 color.gifcolor.gif
Recreation Recreation 1,604 79.6 .0 20.4 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 729 52.5 .0 47.5 color.gifcolor.gif
Aesthetic Value Aesthetic Value 235 100.0 .0 .0 color.gif
Hydropower Generation Other 87 .0 .0 100.0 color.gif
Industrial Industrial 30 83.3 .0 16.7 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Coastal Shoreline

Description of this table
Mercury color.gif 6,465
Pathogens color.gif 1,067
Organic Enrichment/Oxygen Depletion color.gif 490
Turbidity color.gif 213
pH/Acidity/Caustic Conditions color.gif 138
Nutrients color.gif 124
Algal Growth color.gif 91
Polychlorinated Biphenyls (PCBs) color.gif 76
Cause Unknown - Impaired Biota color.gif 70
Metals (other than Mercury) color.gif 62
Temperature color.gif 50
Pesticides color.gif 44
Other Cause color.gif 30
Ammonia color.gif 21
Oil and Grease color.gif 13
Sediment color.gif 5

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National Summary
Probable Sources of Impairments in Assessed Coastal Shoreline

Description of this table
Unknown color.gif 487
Atmospheric Deposition color.gif 388
Municipal Discharges/Sewage color.gif 382
Urban-Related Runoff/Stormwater color.gif 324
Hydromodification color.gif 143
Unspecified Nonpoint Source color.gif 135
Agriculture color.gif 126
Industrial color.gif 119
Recreational Boating And Marinas color.gif 65
Spills/Dumping color.gif 13
Legacy/Historical Pollutants color.gif 8
Land Application/Waste Sites/Tanks color.gif 7
Aquaculture color.gif 5
Natural/Wildlife color.gif 1
Recreation And Tourism (Non-Boating) color.gif 0
Resource Extraction color.gif 0

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National Summary
Water Quality Attainment in Assessed Ocean and Near Coastal

Description of this table

All
Ocean and Near Coastal

54,120.0 Square Miles of Ocean and Near Coastal

Assessed 1,677
Unassessed 52,443
Total Square Miles 54,120







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Description of this table

Assessed
Ocean and Near Coastal

1,677.4 Square Miles of
Assessed Ocean and Near Coastal

Good 618
Threatened 0
Impaired 1,059
Total Square Miles Assessed 1,677

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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
% Good
% Threatened
% Impaired
Recreation Recreation 1,129 97.1 .0 2.9 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 919 40.5 .0 59.5 color.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 888 7.0 .0 93.0 color.gifcolor.gif
Hydropower Generation Other 376 46.7 .0 53.3 color.gifcolor.gif
Agricultural Agricultural 201 100.0 .0 .0 color.gif

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National Summary
Causes of Impairment in Assessed Ocean and Near Coastal

Description of this table
Mercury color.gif 796
Organic Enrichment/Oxygen Depletion color.gif 579
Pesticides color.gif 567
Polychlorinated Biphenyls (PCBs) color.gif 531
Pathogens color.gif 81
Nuisance Exotic Species color.gif 35
Total Toxics color.gif 29
Turbidity color.gif 24
Metals (other than Mercury) color.gif 15
Toxic Organics color.gif 14
Habitat Alterations color.gif 10
Dioxins color.gif 9
pH/Acidity/Caustic Conditions color.gif 7
Nutrients color.gif 7
Temperature color.gif 1
Ammonia color.gif 1

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National Summary
Probable Sources of Impairments in Assessed Ocean and Near Coastal

Description of this table
Atmospheric Deposition color.gif 777
Unknown color.gif 604
Urban-Related Runoff/Stormwater color.gif 453
Municipal Discharges/Sewage color.gif 114
Recreational Boating And Marinas color.gif 8
Hydromodification color.gif 7
Recreation And Tourism (Non-Boating) color.gif 5
Unspecified Nonpoint Source color.gif 4
Construction color.gif 4
Industrial color.gif 4
Spills/Dumping color.gif 2
Natural/Wildlife color.gif 1
Commercial Harbor And Port Activities color.gif 0

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National Summary
Water Quality Attainment in Assessed Wetlands

Description of this table

All
Wetlands

107,700,000.0 Acres of Wetlands

Assessed 1,112,438
Unassessed 106,587,562
Total Acres 107,700,000







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Description of this table

Assessed
Wetlands

1,112,438.3 Acres of
Assessed Wetlands

Good 573,947
Threatened 0
Impaired 538,492
Total Acres Assessed 1,112,438

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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
% Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 1,102,027 57.9 .0 42.1 color.gifcolor.gif
Recreation Recreation 1,044,120 92.9 .0 7.1 color.gifcolor.gif
Public Water Supply Public Water Supply 480,401 100.0 .0 .0 color.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 121,430 .7 .0 99.3 color.gifcolor.gif
Agricultural Agricultural 44,987 37.6 .0 62.4 color.gifcolor.gif
Industrial Industrial 19,032 100.0 .0 .0 color.gif
Hydropower Generation Other 719 100.0 .0 .0 color.gif

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National Summary
Causes of Impairment in Assessed Wetlands

Description of this table
Organic Enrichment/Oxygen Depletion color.gif 396,167
Mercury color.gif 246,160
Pathogens color.gif 72,349
Toxic Inorganics color.gif 28,053
Metals (other than Mercury) color.gif 26,248
Temperature color.gif 14,900
Sediment color.gif 10,786
Algal Growth color.gif 4,631
Flow Alteration(s) color.gif 4,037
Turbidity color.gif 3,915
Nuisance Exotic Species color.gif 2,104
Habitat Alterations color.gif 1,754
Nutrients color.gif 1,720
Cause Unknown - Fish Kills color.gif 1,034
Cause Unknown color.gif 1,000
Fish Consumption Advisory color.gif 1,000
Cause Unknown - Impaired Biota color.gif 973
Noxious Aquatic Plants color.gif 940
pH/Acidity/Caustic Conditions color.gif 838
Polychlorinated Biphenyls (PCBs) color.gif 707
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 299
Trash color.gif 0
Pesticides color.gif 0
Toxic Organics color.gif 0
Ammonia color.gif 0
Total Toxics color.gif 0

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National Summary
Probable Sources of Impairments in Assessed Wetlands

Description of this table
Unknown color.gif 333,053
Agriculture color.gif 201,776
Atmospheric Deposition color.gif 200,741
Industrial color.gif 195,980
Municipal Discharges/Sewage color.gif 72,341
Recreational Boating And Marinas color.gif 72,320
Resource Extraction color.gif 32,215
Natural/Wildlife color.gif 8,332
Hydromodification color.gif 6,870
Unspecified Nonpoint Source color.gif 1,098
Construction color.gif 1,000
Land Application/Waste Sites/Tanks color.gif 680
Other color.gif 237
Urban-Related Runoff/Stormwater color.gif 104

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National Summary
Water Quality Attainment in Assessed Great Lakes Shoreline

Description of this table

All
Great Lakes Shoreline

5,202.2 Miles of Great Lakes Shoreline

Assessed 4,431
Unassessed 772
Total Miles 5,202







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Description of this table

Assessed
Great Lakes Shoreline

4,430.5 Miles of
Assessed Great Lakes Shoreline

Good 78
Threatened 0
Impaired 4,353
Total Miles Assessed 4,431

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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
% Good
% Threatened
% Impaired
Aquatic Life Harvesting Aquatic Life Harvesting 4,064 .0 .0 100.0 color.gif
Agricultural Agricultural 3,131 100.0 .0 .0 color.gif
Hydropower Generation Other 3,131 100.0 .0 .0 color.gif
Industrial Industrial 3,131 100.0 .0 .0 color.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 865 33.1 .0 66.9 color.gifcolor.gif
Recreation Recreation 816 32.2 .0 67.8 color.gifcolor.gif
Public Water Supply Public Water Supply 336 100.0 .0 .0 color.gif

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National Summary
Causes of Impairment in Assessed Great Lakes Shoreline

Description of this table
Polychlorinated Biphenyls (PCBs) color.gif 4,064
Dioxins color.gif 3,471
Pesticides color.gif 2,483
Mercury color.gif 2,194
Pathogens color.gif 621
Nutrients color.gif 380
Sediment color.gif 319
Nuisance Exotic Species color.gif 307
Fish Consumption Advisory color.gif 285
Flow Alteration(s) color.gif 202
Algal Growth color.gif 191
Habitat Alterations color.gif 170
Organic Enrichment/Oxygen Depletion color.gif 138
Other Cause color.gif 19
Toxic Inorganics color.gif 5
Trash color.gif 3

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National Summary
Probable Sources of Impairments in Assessed Great Lakes Shoreline

Description of this table
Atmospheric Deposition color.gif 3,411
Legacy/Historical Pollutants color.gif 867
Agriculture color.gif 620
Municipal Discharges/Sewage color.gif 305
Hydromodification color.gif 231
Unknown color.gif 144
Urban-Related Runoff/Stormwater color.gif 99
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 90
Industrial color.gif 72
Spills/Dumping color.gif 18
Construction color.gif 18
Land Application/Waste Sites/Tanks color.gif 11
Unspecified Nonpoint Source color.gif 6
Natural/Wildlife color.gif 0

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National Summary
Water Quality Attainment in Assessed Great Lakes Open Water

Description of this table

All
Great Lakes Open Water

60,546.0 Square Miles of Great Lakes Open Water

Assessed 53,332
Unassessed 7,214
Total Square Miles 60,546







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Description of this table

Assessed
Great Lakes Open Water

53,331.6 Square Miles of
Assessed Great Lakes Open Water

Good 62
Threatened 0
Impaired 53,270
Total Square Miles Assessed 53,332

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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
% Good
% Threatened
% Impaired
Aquatic Life Harvesting Aquatic Life Harvesting 39,184 .0 .0 100.0 color.gif
Agricultural Agricultural 39,031 100.0 .0 .0 color.gif
Industrial Industrial 39,031 100.0 .0 .0 color.gif
Hydropower Generation Other 39,031 100.0 .0 .0 color.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 14,300 1.5 .0 98.5 color.gifcolor.gif
Public Water Supply Public Water Supply 151 100.0 .0 .0 color.gif
Recreation Recreation 151 100.0 .0 .0 color.gif

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National Summary
Causes of Impairment in Assessed Great Lakes Open Water

Description of this table
Polychlorinated Biphenyls (PCBs) color.gif 39,183
Dioxins color.gif 38,862
Mercury color.gif 29,968
Pesticides color.gif 29,661
Fish Consumption Advisory color.gif 14,087
Organic Enrichment/Oxygen Depletion color.gif 13,867
Total Toxics color.gif 192
Nuisance Exotic Species color.gif 25

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National Summary
Probable Sources of Impairments in Assessed Great Lakes Open Water

Description of this table
Atmospheric Deposition color.gif 53,270
Legacy/Historical Pollutants color.gif 13,991
Urban-Related Runoff/Stormwater color.gif 13,867
Agriculture color.gif 4,373
Unknown color.gif 310
Other color.gif 25

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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.
Size of Assessed Waters with Listed Causes of Impairment
Algal Growth 6,069 886,837 1,638 91   4,631 191  
Ammonia 12,213 208,768 48 21 1 0    
Biotoxins 2,150 17,628            
Cause Unknown 39,175 39,415 34     1,000    
Cause Unknown - Fish Kills 688 9,391       1,034    
Cause Unknown - Impaired Biota 39,113 57,780 1,177 70   973    
Chlorine 747 3,208 5          
Dioxins 4,598 109,289 4,351   9   3,471 38,862
Fish Consumption Advisory 9,916 539,504 3,084 0   1,000 285 14,087
Flow Alteration(s) 41,985 187,888 3     4,037 202  
Habitat Alterations 63,766 319,198 2   10 1,754 170  
Mercury 102,346 8,037,372 14,139 6,465 796 246,160 2,194 29,968
Metals (other than Mercury) 76,526 983,950 1,846 62 15 26,248    
Noxious Aquatic Plants 354 79,762 1,855     940    
Nuisance Exotic Species 1,448 752,707 763   35 2,104 307 25
Nuisance Native Species 127 100,624 4          
Nutrients 104,102 3,160,647 1,265 124 7 1,720 380  
Oil and Grease 3,085 1,331 101 13        
Organic Enrichment/Oxygen Depletion 87,915 1,399,795 5,435 490 579 396,167 138 13,867
Other Cause 12,020 196,433 3,431 30     19  
Pathogens 164,065 315,694 6,881 1,067 81 72,349 621  
Pesticides 18,893 258,953 1,807 44 567 0 2,483 29,661
pH/Acidity/Caustic Conditions 29,151 890,997 80 138 7 838    
Polychlorinated Biphenyls (PCBs) 79,632 2,961,007 7,607 76 531 707 4,064 39,183
Radiation 677 48            
Salinity/Total Dissolved Solids/Chlorides/Sulfates 34,293 459,494 44     299    
Sediment 120,729 761,496 224 5   10,786 319  
Taste, Color and Odor 854 162,678 7          
Temperature 68,745 218,251 165 50 1 14,900    
Total Toxics 10,729 12,834 333   29 0   192
Toxic Inorganics 7,641 6,170 6     28,053 5  
Toxic Organics 4,982 10,044 718   14 0    
Trash 1,233 4,600 434     0 3  
Turbidity 36,715 1,449,814 319 213 24 3,915    

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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.
Size of Assessed Waters with Probable Sources of Impairments
Agriculture 129,795 989,524 2,583 126   201,776 620 4,373
Aquaculture 312 4,620 0 5        
Atmospheric Deposition 100,181 4,848,277 8,372 388 777 200,741 3,411 53,270
Commercial Harbor And Port Activities 52   495   0      
Construction 13,042 245,348 4   4 1,000 18  
Groundwater Loadings/Withdrawals 270 438 0          
Habitat Alterations (Not Directly Related To Hydromodification) 35,172 191,611 2,201       90  
Hydromodification 61,276 653,680 2,065 143 7 6,870 231  
Industrial 17,877 241,431 4,326 119 4 195,980 72  
Land Application/Waste Sites     1          
Land Application/Waste Sites/Tanks 9,397 55,166 84 7   680 11  
Legacy/Historical Pollutants 6,035 780,849 1,563 8     867 13,991
Military Bases 42 2,639            
Municipal Discharges/Sewage 57,647 709,903 5,550 382 114 72,341 305  
Natural/Wildlife 52,611 762,960 3,523 1 1 8,332 0  
Other 10,022 807,763 4,465     237   25
Recreation And Tourism (Non-Boating) 1,959 112,208 10 0 5      
Recreational Boating And Marinas 142 34,724 794 65 8 72,320    
Resource Extraction 29,064 441,667 780 0   32,215    
Silviculture (Forestry) 19,719 139,349 0          
Spills/Dumping 3,305 184,388 3,162 13 2   18  
Unknown 102,213 3,142,546 5,781 487 604 333,053 144 310
Unspecified Nonpoint Source 48,040 592,182 2,603 135 4 1,098 6  
Urban-Related Runoff/Stormwater 60,011 681,682 3,182 324 453 104 99 13,867

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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.
2002 color.gif 25 26
2003 color.gif 4 7
2004 color.gif 159 207
2005 color.gif 107 238
2006 color.gif 85 101
2007 color.gif 233 443
2008 color.gif 339 423
2009 color.gif 318 539
2010 color.gif 344 437
2011 color.gif 252 307
2012 color.gif 249 381
2013 color.gif 19 21

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Impaired Waters Listed By State

Description of this table
Alabama color.gif 283
Alaska color.gif 35
American Samoa color.gif 44
Arizona color.gif 91
Arkansas color.gif 225
California color.gif 1,021
Colorado color.gif 244
Connecticut color.gif 461
Delaware color.gif 101
District Of Columbia color.gif 36
Florida color.gif 2,292
Georgia color.gif 215
Guam color.gif 47
Hawaii color.gif 309
Idaho color.gif 916
Illinois color.gif 1,057
Indiana color.gif 1,836
Iowa color.gif 480
Kansas color.gif 1,372
Kentucky color.gif 1,300
Louisiana color.gif 236
Maine color.gif 114
Maryland color.gif 184
Massachusetts color.gif 720
Michigan color.gif 2,352
Minnesota color.gif 1,144
Mississippi color.gif 229
Missouri color.gif 257
Montana color.gif 584
N. Mariana Islands color.gif 24
Nebraska color.gif 342
Nevada color.gif 215
New Hampshire color.gif 1,449
New Jersey color.gif 716
New Mexico color.gif 209
New York color.gif 1,543
North Carolina color.gif 1,130
North Dakota color.gif 201
Ohio color.gif 267
Oklahoma color.gif 657
Oregon color.gif 1,397
Pennsylvania color.gif 6,957
Puerto Rico color.gif 231
Rhode Island color.gif 120
South Carolina color.gif 961
South Dakota color.gif 155
Tennessee color.gif 1,028
Texas color.gif 719
Utah color.gif 156
Vermont color.gif 104
Virgin Islands color.gif 87
Virginia color.gif 1,523
Washington color.gif 2,420
West Virginia color.gif 1,097
Wisconsin color.gif 593
Wyoming color.gif 107

Total: 42,593 impaired waters


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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.
Number of Causes of
Impairment Addressed
Mercury color.gif 20,332 20,360
Pathogens color.gif 12,568 12,865
Metals (other than Mercury) color.gif 9,407 9,597
Nutrients color.gif 5,856 7,044
Sediment color.gif 3,891 4,528
Temperature color.gif 2,251 2,261
Organic Enrichment/Oxygen Depletion color.gif 2,136 2,255
pH/Acidity/Caustic Conditions color.gif 1,937 1,996
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,644 1,702
Turbidity color.gif 1,520 1,732
Pesticides color.gif 1,216 1,316
Ammonia color.gif 1,114 1,178
Polychlorinated Biphenyls (PCBs) color.gif 528 549
Chlorine color.gif 335 341
Other Cause color.gif 268 323
Toxic Inorganics color.gif 205 205
Toxic Organics color.gif 158 199
Cause Unknown - Impaired Biota color.gif 128 132
Total Toxics color.gif 110 120
Algal Growth color.gif 89 97
Habitat Alterations color.gif 83 84
Trash color.gif 74 74
Dioxins color.gif 27 28
Noxious Aquatic Plants color.gif 21 22
Radiation color.gif 19 22
Oil and Grease color.gif 14 14
Cause Unknown color.gif 7 7
Nuisance Exotic Species color.gif 3 6
Fish Consumption Advisory color.gif 2 2

Total: 65,943 TMDLs; 69,059 Causes of Impairment Addressed

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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.
Alabama color.gif 303
Alaska color.gif 58
American Samoa color.gif 2
Arizona color.gif 88
Arkansas color.gif 318
California color.gif 1,810
Colorado color.gif 1,005
Connecticut color.gif 372
Delaware color.gif 579
District Of Columbia color.gif 374
Florida color.gif 1,069
Georgia color.gif 1,734
Guam color.gif 18
Hawaii color.gif 64
Idaho color.gif 2,109
Illinois color.gif 427
Indiana color.gif 1,148
Iowa color.gif 205
Kansas color.gif 3,217
Kentucky color.gif 302
Louisiana color.gif 750
Maine color.gif 337
Maryland color.gif 795
Massachusetts color.gif 581
Michigan color.gif 238
Minnesota color.gif 1,617
Mississippi color.gif 1,438
Missouri color.gif 288
Montana color.gif 1,355
Nebraska color.gif 143
Nevada color.gif 67
New Hampshire color.gif 6,050
New Jersey color.gif 616
New Mexico color.gif 322
New York color.gif 666
North Carolina color.gif 13,443
North Dakota color.gif 136
Ohio color.gif 1,761
Oklahoma color.gif 683
Oregon color.gif 1,241
Pennsylvania color.gif 7,152
Puerto Rico color.gif 321
Rhode Island color.gif 211
South Carolina color.gif 516
South Dakota color.gif 329
Tennessee color.gif 1,240
Texas color.gif 253
Utah color.gif 311
Vermont color.gif 119
Virgin Islands color.gif 66
Virginia color.gif 1,454
Washington color.gif 1,486
West Virginia color.gif 4,123
Wisconsin color.gif 247
Wyoming color.gif 386

Total: 65,943 TMDLs


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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.
1996 color.gif 135 136
1997 color.gif 337 351
1998 color.gif 402 408
1999 color.gif 330 373
2000 color.gif 1,556 1,581
2001 color.gif 2,580 2,616
2002 color.gif 2,743 2,823
2003 color.gif 2,999 3,272
2004 color.gif 3,378 3,636
2005 color.gif 4,319 4,634
2006 color.gif 4,215 4,567
2007 color.gif 4,321 4,651
2008 color.gif 9,263 9,546
2009 color.gif 4,399 4,625
2010 color.gif 2,572 2,708
2011 color.gif 2,830 3,113
2012 color.gif 2,883 3,151
2013 color.gif 15,538 15,626
2014 color.gif 1,143 1,242

Total: 65,943 TMDLs; 69,059 Causes of Impairment Addressed

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Status of Available Data Used in This Report

Description of this table
Alabama 2012 2012
Alaska 2010 2010
American Samoa 2010 2010
Arizona 2010 2010
Arkansas 2008 2008
California 2010 2010
Colorado 2010 2010
Connecticut 2012 2012
Delaware 2006 2006
District Of Columbia 2012 2012
Florida 2010 2010
Georgia 2010 2010
Guam 2010 2010
Hawaii 2006 2006
Idaho 2010 2010
Illinois 2010 2006
Indiana 2010 2008
Iowa 2012 2012
Kansas 2014 2014
Kentucky 2010 2010
Louisiana 2012 2012
Maine 2010 2010
Maryland 2002 2010
Massachusetts 2012 2012
Michigan 2010 2008
Minnesota 2010 2008
Mississippi 2012 2012
Missouri 2012 2012
Montana 2012 2012
N. Mariana Islands 2010 2010
Nebraska 2014 2014
Nevada 2010 2010
New Hampshire 2010 2010
New Jersey 2010 2010
New Mexico 2012 2012
New York 2012 2012
North Carolina 2012 2012
North Dakota 2012 2012
Ohio 2010 2008
Oklahoma 2012 2012
Oregon 2006 2006
Pennsylvania 2006 2004
Puerto Rico 2012 2012
Rhode Island 2012 2012
South Carolina 2010 2010
South Dakota 2010 2012
Tennessee 2010 2010
Texas 2010 2010
Utah 2010 2010
Vermont 2012 2012
Virgin Islands 2012 2012
Virginia 2010 2010
Washington 2008 2008
West Virginia 2010 2010
Wisconsin 2006 2006
Wyoming 2012 2012


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