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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
 
    478,342 5,587,941 7,327 900 616 574,082 78 62
    7,657 145,572            
    562,503 12,175,292 26,084 7,262 1,058 538,918 4,353 53,270
1,048,502 17,908,805 33,411 8,162 1,674 1,113,000 4,431 53,332
3,533,205 41,666,049 87,791 58,618 54,120 107,700,000 5,202 60,546
29.7 43.0 38.1 13.9 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
12 5 1 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 1,048,502
Unassessed 2,484,703
Total Miles 3,533,205







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Description of this table

Assessed
Rivers and Streams

1,048,502.2 Miles of
Assessed Rivers and Streams

Good 478,342
Threatened 7,657
Impaired 562,503
Total Miles Assessed 1,048,502

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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 815,834 56.9 .6 42.5 color.gifcolor.gifcolor.gif
Recreation Recreation 431,966 58.4 1.5 40.1 color.gifcolor.gifcolor.gif
Agricultural Agricultural 382,291 96.0 .1 3.9 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 277,773 28.7 .9 70.4 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 199,167 76.8 .2 23.0 color.gifcolor.gifcolor.gif
Industrial Industrial 198,273 97.8 .0 2.2 color.gifcolor.gif
Hydropower Generation Other 85,948 97.9 .0 2.1 color.gifcolor.gif
Aesthetic Value Aesthetic Value 28,790 92.8 .0 7.2 color.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 4,541 80.2 .0 19.8 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Rivers and Streams

Description of this table
Pathogens color.gif 169,436
Sediment color.gif 119,356
Nutrients color.gif 105,970
Mercury color.gif 102,913
Organic Enrichment/Oxygen Depletion color.gif 88,368
Polychlorinated Biphenyls (PCBs) color.gif 80,542
Metals (other than Mercury) color.gif 76,333
Temperature color.gif 68,671
Habitat Alterations color.gif 63,697
Flow Alteration(s) color.gif 42,580
Cause Unknown - Impaired Biota color.gif 39,853
Cause Unknown color.gif 39,413
Turbidity color.gif 38,032
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 33,880
pH/Acidity/Caustic Conditions color.gif 28,004
Pesticides color.gif 19,088
Ammonia color.gif 11,654
Other Cause color.gif 11,380
Total Toxics color.gif 10,708
Fish Consumption Advisory color.gif 9,916
Toxic Inorganics color.gif 7,607
Algal Growth color.gif 6,013
Dioxins color.gif 5,044
Toxic Organics color.gif 4,990
Oil and Grease color.gif 3,014
Biotoxins color.gif 2,150
Nuisance Exotic Species color.gif 1,424
Trash color.gif 1,415
Taste, Color and Odor color.gif 854
Chlorine color.gif 754
Cause Unknown - Fish Kills color.gif 678
Radiation color.gif 656
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 131,550
Unknown color.gif 103,802
Atmospheric Deposition color.gif 99,553
Urban-Related Runoff/Stormwater color.gif 61,660
Hydromodification color.gif 60,188
Municipal Discharges/Sewage color.gif 59,659
Natural/Wildlife color.gif 52,613
Unspecified Nonpoint Source color.gif 49,070
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 34,689
Resource Extraction color.gif 29,951
Silviculture (Forestry) color.gif 19,339
Industrial color.gif 17,932
Construction color.gif 12,414
Other color.gif 10,150
Land Application/Waste Sites/Tanks color.gif 10,138
Legacy/Historical Pollutants color.gif 5,994
Spills/Dumping color.gif 3,085
Recreation And Tourism (Non-Boating) color.gif 1,808
Aquaculture color.gif 338
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 20

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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 17,908,805
Unassessed 23,757,244
Total Acres 41,666,049







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

17,908,804.7 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 5,587,941
Threatened 145,572
Impaired 12,175,292
Total Acres Assessed 17,908,805

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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 10,295,637 59.1 1.2 39.7 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 9,916,066 22.0 1.3 76.8 color.gifcolor.gifcolor.gif
Recreation Recreation 8,152,614 85.0 1.6 13.4 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 6,102,941 79.3 1.8 18.9 color.gifcolor.gifcolor.gif
Agricultural Agricultural 5,912,191 96.9 .0 3.1 color.gifcolor.gif
Industrial Industrial 3,251,743 99.9 .0 .1 color.gifcolor.gif
Hydropower Generation Other 2,474,326 87.2 .0 12.8 color.gifcolor.gif
Aesthetic Value Aesthetic Value 1,212,475 62.6 .0 37.4 color.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 229 84.3 .0 15.7 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 7,941,479
Nutrients color.gif 3,146,731
Polychlorinated Biphenyls (PCBs) color.gif 2,955,823
Organic Enrichment/Oxygen Depletion color.gif 1,436,279
Turbidity color.gif 1,340,760
Metals (other than Mercury) color.gif 989,794
pH/Acidity/Caustic Conditions color.gif 951,141
Algal Growth color.gif 907,445
Nuisance Exotic Species color.gif 752,707
Sediment color.gif 694,696
Fish Consumption Advisory color.gif 539,504
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 458,486
Habitat Alterations color.gif 319,844
Pathogens color.gif 319,179
Pesticides color.gif 259,381
Temperature color.gif 238,548
Ammonia color.gif 207,141
Other Cause color.gif 195,863
Flow Alteration(s) color.gif 189,938
Dioxins color.gif 109,156
Nuisance Native Species color.gif 100,137
Noxious Aquatic Plants color.gif 79,641
Cause Unknown - Impaired Biota color.gif 57,780
Cause Unknown color.gif 42,798
Toxic Organics color.gif 30,501
Taste, Color and Odor color.gif 20,838
Biotoxins color.gif 17,628
Total Toxics color.gif 12,834
Cause Unknown - Fish Kills color.gif 9,391
Toxic Inorganics color.gif 6,027
Trash color.gif 4,600
Chlorine color.gif 3,208
Oil and Grease color.gif 1,321
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 4,677,732
Unknown color.gif 3,039,048
Agriculture color.gif 1,062,779
Other color.gif 799,739
Legacy/Historical Pollutants color.gif 762,335
Natural/Wildlife color.gif 759,858
Unspecified Nonpoint Source color.gif 672,427
Municipal Discharges/Sewage color.gif 643,718
Urban-Related Runoff/Stormwater color.gif 616,134
Hydromodification color.gif 582,996
Resource Extraction color.gif 427,925
Industrial color.gif 261,898
Construction color.gif 246,952
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 187,594
Spills/Dumping color.gif 177,655
Recreation And Tourism (Non-Boating) color.gif 112,158
Silviculture (Forestry) color.gif 76,425
Land Application/Waste Sites/Tanks color.gif 54,142
Recreational Boating And Marinas color.gif 34,907
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 33,411
Unassessed 54,379
Total Square Miles 87,791







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Description of this table

Assessed
Bays and Estuaries

33,411.2 Square Miles of
Assessed Bays and Estuaries

Good 7,327
Threatened 0
Impaired 26,084
Total Square Miles Assessed 33,411

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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 24,221 16.5 .0 83.5 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 20,250 40.6 .0 59.4 color.gifcolor.gif
Recreation Recreation 14,536 71.1 .0 28.9 color.gifcolor.gif
Agricultural Agricultural 3,789 96.6 .0 3.4 color.gifcolor.gif
Industrial Industrial 3,223 100.0 .0 .0 color.gifcolor.gif
Hydropower Generation Other 3,167 100.0 .0 .0 color.gifcolor.gif
Public Water Supply Public Water Supply 186 77.0 .0 23.0 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 14,146
Polychlorinated Biphenyls (PCBs) color.gif 7,610
Pathogens color.gif 6,944
Organic Enrichment/Oxygen Depletion color.gif 5,382
Dioxins color.gif 4,351
Other Cause color.gif 3,428
Fish Consumption Advisory color.gif 3,084
Metals (other than Mercury) color.gif 1,869
Noxious Aquatic Plants color.gif 1,855
Pesticides color.gif 1,810
Algal Growth color.gif 1,474
Nutrients color.gif 1,249
Cause Unknown - Impaired Biota color.gif 1,177
Nuisance Exotic Species color.gif 763
Toxic Organics color.gif 718
Trash color.gif 434
Turbidity color.gif 363
Total Toxics color.gif 333
Sediment color.gif 224
Temperature color.gif 145
Oil and Grease color.gif 101
pH/Acidity/Caustic Conditions color.gif 64
Cause Unknown color.gif 58
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 44
Ammonia color.gif 41
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 5,784
Municipal Discharges/Sewage color.gif 5,376
Other color.gif 4,465
Industrial color.gif 4,302
Natural/Wildlife color.gif 3,523
Urban-Related Runoff/Stormwater color.gif 3,188
Spills/Dumping color.gif 3,162
Unspecified Nonpoint Source color.gif 2,593
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 8,162
Unassessed 50,456
Total Miles 58,618







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Description of this table

Assessed
Coastal Shoreline

8,162.2 Miles of
Assessed Coastal Shoreline

Good 900
Threatened 0
Impaired 7,262
Total Miles Assessed 8,162

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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 7,123 6.5 .0 93.5 color.gifcolor.gif
Recreation Recreation 1,686 77.0 .0 23.0 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 916 45.6 .0 54.4 color.gifcolor.gif
Aesthetic Value Aesthetic Value 235 100.0 .0 .0 color.gif
Industrial Industrial 30 83.3 .0 16.7 color.gifcolor.gif
Hydropower Generation Other 4 .0 .0 100.0 color.gif

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National Summary
Causes of Impairment in Assessed Coastal Shoreline

Description of this table
Mercury color.gif 6,461
Pathogens color.gif 1,043
Organic Enrichment/Oxygen Depletion color.gif 437
Turbidity color.gif 331
pH/Acidity/Caustic Conditions color.gif 143
Nutrients color.gif 131
Temperature color.gif 96
Oil and Grease color.gif 95
Algal Growth color.gif 93
Cause Unknown - Impaired Biota color.gif 74
Metals (other than Mercury) color.gif 60
Polychlorinated Biphenyls (PCBs) color.gif 50
Pesticides color.gif 36
Ammonia color.gif 22
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 497
Atmospheric Deposition color.gif 388
Municipal Discharges/Sewage color.gif 370
Urban-Related Runoff/Stormwater color.gif 273
Hydromodification color.gif 140
Unspecified Nonpoint Source color.gif 121
Agriculture color.gif 113
Recreational Boating And Marinas color.gif 106
Industrial color.gif 94
Spills/Dumping color.gif 13
Legacy/Historical Pollutants color.gif 8
Aquaculture color.gif 5
Construction color.gif 4
Land Application/Waste Sites/Tanks color.gif 4
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 1,674
Unassessed 52,446
Total Square Miles 54,120







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Description of this table

Assessed
Ocean and Near Coastal

1,674.4 Square Miles of
Assessed Ocean and Near Coastal

Good 616
Threatened 0
Impaired 1,058
Total Square Miles Assessed 1,674

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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 1,126 97.2 .0 2.8 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
Organic Enrichment/Oxygen Depletion color.gif 579
Polychlorinated Biphenyls (PCBs) color.gif 531
Mercury color.gif 281
Pathogens color.gif 80
Pesticides color.gif 52
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
Urban-Related Runoff/Stormwater color.gif 379
Atmospheric Deposition color.gif 269
Unknown color.gif 116
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 1,113,000
Unassessed 106,587,000
Total Acres 107,700,000







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Description of this table

Assessed
Wetlands

1,112,999.9 Acres of
Assessed Wetlands

Good 574,082
Threatened 0
Impaired 538,918
Total Acres Assessed 1,113,000

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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 1,102,403 57.9 .0 42.1 color.gifcolor.gif
Recreation Recreation 1,044,380 92.9 .0 7.1 color.gifcolor.gif
Public Water Supply Public Water Supply 480,667 100.0 .0 .0 color.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 121,882 .8 .0 99.2 color.gifcolor.gif
Agricultural Agricultural 45,655 38.5 .0 61.5 color.gifcolor.gif
Industrial Industrial 18,460 100.0 .0 .0 color.gif
Hydropower Generation Other 985 100.0 .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 72,341
Metals (other than Mercury) color.gif 28,168
Toxic Inorganics color.gif 28,053
Temperature color.gif 14,900
Sediment color.gif 10,786
Algal Growth color.gif 4,631
Flow Alteration(s) color.gif 4,098
Turbidity color.gif 3,915
Nuisance Exotic Species color.gif 2,165
Habitat Alterations color.gif 1,815
Nutrients color.gif 1,720
Cause Unknown - Impaired Biota color.gif 1,214
Cause Unknown - Fish Kills color.gif 1,034
Cause Unknown color.gif 1,000
Fish Consumption Advisory color.gif 1,000
Noxious Aquatic Plants color.gif 940
Polychlorinated Biphenyls (PCBs) color.gif 919
pH/Acidity/Caustic Conditions color.gif 838
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 299
Toxic Organics color.gif 212
Dioxins color.gif 212
Pesticides color.gif 125
Trash 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 333,267
Agriculture color.gif 201,901
Atmospheric Deposition color.gif 200,741
Industrial color.gif 196,192
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 1,133
Construction color.gif 1,000
Land Application/Waste Sites/Tanks color.gif 680
Other color.gif 237
Legacy/Historical Pollutants color.gif 212
Urban-Related Runoff/Stormwater color.gif 158
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 33
Spills/Dumping color.gif 6

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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
Industrial Industrial 3,131 100.0 .0 .0 color.gif
Hydropower Generation Other 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
Construction color.gif 18
Spills/Dumping 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
Recreation Recreation 151 100.0 .0 .0 color.gif
Public Water Supply Public Water Supply 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 6,013 907,445 1,474 93 0 4,631 191  
Ammonia 11,654 207,141 41 22 1 0    
Biotoxins 2,150 17,628            
Cause Unknown 39,413 42,798 58     1,000    
Cause Unknown - Fish Kills 678 9,391       1,034    
Cause Unknown - Impaired Biota 39,853 57,780 1,177 74   1,214    
Chlorine 754 3,208 5          
Dioxins 5,044 109,156 4,351   9 212 3,471 38,862
Fish Consumption Advisory 9,916 539,504 3,084     1,000 285 14,087
Flow Alteration(s) 42,580 189,938 3     4,098 202  
Habitat Alterations 63,697 319,844 2   10 1,815 170  
Mercury 102,913 7,941,479 14,146 6,461 281 246,160 2,194 29,968
Metals (other than Mercury) 76,333 989,794 1,869 60 15 28,168    
Noxious Aquatic Plants 354 79,641 1,855     940    
Nuisance Exotic Species 1,424 752,707 763   35 2,165 307 25
Nuisance Native Species 127 100,137 4          
Nutrients 105,970 3,146,731 1,249 131 7 1,720 380  
Oil and Grease 3,014 1,321 101 95        
Organic Enrichment/Oxygen Depletion 88,368 1,436,279 5,382 437 579 396,167 138 13,867
Other Cause 11,380 195,863 3,428       19  
Pathogens 169,436 319,179 6,944 1,043 80 72,341 621  
Pesticides 19,088 259,381 1,810 36 52 125 2,483 29,661
pH/Acidity/Caustic Conditions 28,004 951,141 64 143 7 838    
Polychlorinated Biphenyls (PCBs) 80,542 2,955,823 7,610 50 531 919 4,064 39,183
Radiation 656 48            
Salinity/Total Dissolved Solids/Chlorides/Sulfates 33,880 458,486 44     299    
Sediment 119,356 694,696 224 5   10,786 319  
Taste, Color and Odor 854 20,838 7          
Temperature 68,671 238,548 145 96 1 14,900    
Total Toxics 10,708 12,834 333   29 0   192
Toxic Inorganics 7,607 6,027 6     28,053 5  
Toxic Organics 4,990 30,501 718   14 212    
Trash 1,415 4,600 434     0 3  
Turbidity 38,032 1,340,760 363 331 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 131,550 1,062,779 2,583 113   201,901 620 4,373
Aquaculture 338 4,620 0 5        
Atmospheric Deposition 99,553 4,677,732 8,372 388 269 200,741 3,411 53,270
Commercial Harbor And Port Activities 52   495   0      
Construction 12,414 246,952 4 4 4 1,000 18  
Groundwater Loadings/Withdrawals 270 438 0          
Habitat Alterations (Not Directly Related To Hydromodification) 34,689 187,594 2,201     33 90  
Hydromodification 60,188 582,996 2,065 140 7 6,870 231  
Industrial 17,932 261,898 4,302 94 4 196,192 72  
Land Application/Waste Sites     1          
Land Application/Waste Sites/Tanks 10,138 54,142 84 4   680 11  
Legacy/Historical Pollutants 5,994 762,335 1,563 8   212 867 13,991
Military Bases 20 2,639            
Municipal Discharges/Sewage 59,659 643,718 5,376 370 114 72,341 305  
Natural/Wildlife 52,613 759,858 3,523 1 1 8,332 0  
Other 10,150 799,739 4,465     237   25
Recreation And Tourism (Non-Boating) 1,808 112,158 10 0 5      
Recreational Boating And Marinas 142 34,907 794 106 8 72,320    
Resource Extraction 29,951 427,925 780 0   32,215    
Silviculture (Forestry) 19,339 76,425 0          
Spills/Dumping 3,085 177,655 3,162 13 2 6 18  
Unknown 103,802 3,039,048 5,784 497 116 333,267 144 310
Unspecified Nonpoint Source 49,070 672,427 2,593 121 4 1,133 6  
Urban-Related Runoff/Stormwater 61,660 616,134 3,188 273 379 158 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 159 211
2005 color.gif 107 241
2006 color.gif 85 102
2007 color.gif 245 458
2008 color.gif 344 448
2009 color.gif 318 542
2010 color.gif 350 452
2011 color.gif 294 383
2012 color.gif 278 429
2013 color.gif 292 348
2014 color.gif 340 507
2015 color.gif 48 71

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Impaired Waters Listed By State

Description of this table
Alabama color.gif 220
Alaska color.gif 35
American Samoa color.gif 45
Arizona color.gif 90
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 242
Guam color.gif 47
Hawaii color.gif 352
Idaho color.gif 741
Illinois color.gif 1,057
Indiana color.gif 1,836
Iowa color.gif 480
Kansas color.gif 1,372
Kentucky color.gif 1,433
Louisiana color.gif 236
Maine color.gif 113
Maryland color.gif 184
Massachusetts color.gif 720
Michigan color.gif 2,584
Minnesota color.gif 1,347
Mississippi color.gif 229
Missouri color.gif 270
Montana color.gif 480
N. Mariana Islands color.gif 24
Nebraska color.gif 342
Nevada color.gif 210
New Hampshire color.gif 1,449
New Jersey color.gif 710
New Mexico color.gif 237
New York color.gif 1,543
North Carolina color.gif 1,152
North Dakota color.gif 217
Ohio color.gif 267
Oklahoma color.gif 635
Oregon color.gif 1,397
Pennsylvania color.gif 6,957
Puerto Rico color.gif 195
Rhode Island color.gif 120
South Carolina color.gif 907
South Dakota color.gif 166
Tennessee color.gif 1,012
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 663
Wyoming color.gif 107

Total: 42,909 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 21,545 21,575
Pathogens color.gif 13,028 13,337
Metals (other than Mercury) color.gif 9,828 10,022
Nutrients color.gif 6,037 7,307
Sediment color.gif 3,922 4,573
Temperature color.gif 2,305 2,315
Organic Enrichment/Oxygen Depletion color.gif 2,150 2,274
pH/Acidity/Caustic Conditions color.gif 1,945 2,004
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,710 1,768
Turbidity color.gif 1,590 1,815
Pesticides color.gif 1,233 1,339
Ammonia color.gif 1,114 1,178
Polychlorinated Biphenyls (PCBs) color.gif 499 518
Chlorine color.gif 335 341
Other Cause color.gif 268 323
Toxic Inorganics color.gif 206 206
Toxic Organics color.gif 158 199
Cause Unknown - Impaired Biota color.gif 128 132
Total Toxics color.gif 110 120
Algal Growth color.gif 93 101
Habitat Alterations color.gif 83 84
Trash color.gif 75 75
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: 68,455 TMDLs; 71,707 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 59
American Samoa color.gif 2
Arizona color.gif 88
Arkansas color.gif 318
California color.gif 1,814
Colorado color.gif 1,005
Connecticut color.gif 407
Delaware color.gif 581
District Of Columbia color.gif 385
Florida color.gif 2,246
Georgia color.gif 1,700
Guam color.gif 43
Hawaii color.gif 65
Idaho color.gif 2,162
Illinois color.gif 429
Indiana color.gif 1,214
Iowa color.gif 212
Kansas color.gif 3,253
Kentucky color.gif 329
Louisiana color.gif 750
Maine color.gif 341
Maryland color.gif 830
Massachusetts color.gif 600
Michigan color.gif 238
Minnesota color.gif 1,789
Mississippi color.gif 1,440
Missouri color.gif 288
Montana color.gif 1,444
Nebraska color.gif 171
Nevada color.gif 67
New Hampshire color.gif 6,052
New Jersey color.gif 616
New Mexico color.gif 334
New York color.gif 718
North Carolina color.gif 13,443
North Dakota color.gif 136
Ohio color.gif 1,761
Oklahoma color.gif 704
Oregon color.gif 1,241
Pennsylvania color.gif 7,152
Puerto Rico color.gif 321
Rhode Island color.gif 217
South Carolina color.gif 521
South Dakota color.gif 329
Tennessee color.gif 1,271
Texas color.gif 257
Utah color.gif 319
Vermont color.gif 119
Virgin Islands color.gif 66
Virginia color.gif 1,478
Washington color.gif 1,486
West Virginia color.gif 4,700
Wisconsin color.gif 247
Wyoming color.gif 394

Total: 68,455 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 1,555 1,580
2001 color.gif 2,580 2,616
2002 color.gif 2,742 2,822
2003 color.gif 2,999 3,272
2004 color.gif 3,392 3,650
2005 color.gif 4,319 4,634
2006 color.gif 4,204 4,555
2007 color.gif 4,321 4,651
2008 color.gif 9,264 9,546
2009 color.gif 4,399 4,623
2010 color.gif 2,572 2,708
2011 color.gif 2,830 3,113
2012 color.gif 2,883 3,151
2013 color.gif 15,534 15,624
2014 color.gif 3,338 3,511
2015 color.gif 319 383

Total: 68,455 TMDLs; 71,707 Causes of Impairment Addressed

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Status of Available Data Used in This Report

Description of this table
Alabama 2014 2014
Alaska 2010 2010
American Samoa 2014 2014
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 2012 2012
Guam 2010 2010
Hawaii 2014 2014
Idaho 2012 2012
Illinois 2010 2006
Indiana 2010 2008
Iowa 2012 2012
Kansas 2014 2014
Kentucky 2012 2012
Louisiana 2012 2012
Maine 2012 2012
Maryland 2002 2010
Massachusetts 2012 2012
Michigan 2010 2010
Minnesota 2010 2010
Mississippi 2012 2012
Missouri 2014 2014
Montana 2014 2014
N. Mariana Islands 2014 2014
Nebraska 2014 2014
Nevada 2012 2012
New Hampshire 2010 2010
New Jersey 2012 2012
New Mexico 2014 2014
New York 2012 2012
North Carolina 2014 2014
North Dakota 2014 2014
Ohio 2010 2008
Oklahoma 2014 2014
Oregon 2006 2006
Pennsylvania 2006 2004
Puerto Rico 2014 2014
Rhode Island 2012 2012
South Carolina 2012 2012
South Dakota 2014 2014
Tennessee 2012 2012
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 2008
Wyoming 2012 2012


TMDL Document Search


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