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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
 
    458,877 5,826,739 9,425 1,216 618 574,624 78 62
    5,198 19,760            
    519,282 12,057,700 23,230 7,205 1,059 539,270 4,353 53,270
983,356 17,904,199 32,655 8,421 1,677 1,113,893 4,431 53,332
3,533,205 41,666,049 87,791 58,618 54,120 107,700,000 5,202 60,546
27.8 43.0 37.2 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 983,356
Unassessed 2,549,849
Total Miles 3,533,205







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Description of this table

Assessed
Rivers and Streams

983,356.5 Miles of
Assessed Rivers and Streams

Good 458,877
Threatened 5,198
Impaired 519,282
Total Miles Assessed 983,356

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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 765,181 55.8 .4 43.8 color.gifcolor.gifcolor.gif
Recreation Recreation 391,820 56.6 1.0 42.4 color.gifcolor.gifcolor.gif
Agricultural Agricultural 354,934 95.5 .2 4.4 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 255,735 36.2 .1 63.7 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 197,779 77.8 .1 22.2 color.gifcolor.gifcolor.gif
Industrial Industrial 197,136 97.8 .0 2.2 color.gifcolor.gif
Hydropower Generation Other 85,231 97.9 .0 2.1 color.gifcolor.gif
Aesthetic Value Aesthetic Value 26,257 92.1 .0 7.9 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 160,084
Sediment color.gif 124,919
Nutrients color.gif 99,466
Organic Enrichment/Oxygen Depletion color.gif 85,464
Polychlorinated Biphenyls (PCBs) color.gif 78,332
Metals (other than Mercury) color.gif 75,261
Temperature color.gif 67,431
Mercury color.gif 64,469
Habitat Alterations color.gif 63,308
Flow Alteration(s) color.gif 40,862
Cause Unknown color.gif 40,496
Cause Unknown - Impaired Biota color.gif 38,018
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 33,975
Turbidity color.gif 28,714
pH/Acidity/Caustic Conditions color.gif 28,424
Pesticides color.gif 17,072
Other Cause color.gif 12,318
Ammonia color.gif 12,043
Fish Consumption Advisory color.gif 10,267
Total Toxics color.gif 9,118
Toxic Inorganics color.gif 7,890
Algal Growth color.gif 5,993
Toxic Organics color.gif 4,474
Dioxins color.gif 4,322
Oil and Grease color.gif 2,809
Biotoxins color.gif 2,150
Nuisance Exotic Species color.gif 1,440
Trash color.gif 761
Cause Unknown - Fish Kills color.gif 688
Radiation color.gif 677
Chlorine color.gif 621
Taste, Color and Odor color.gif 605
Noxious Aquatic Plants color.gif 343
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 125,220
Unknown color.gif 101,886
Atmospheric Deposition color.gif 99,648
Hydromodification color.gif 57,997
Urban-Related Runoff/Stormwater color.gif 56,126
Municipal Discharges/Sewage color.gif 53,919
Natural/Wildlife color.gif 52,365
Unspecified Nonpoint Source color.gif 48,270
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 33,732
Resource Extraction color.gif 28,809
Silviculture (Forestry) color.gif 19,562
Industrial color.gif 16,060
Construction color.gif 12,716
Other color.gif 9,231
Land Application/Waste Sites/Tanks color.gif 8,168
Legacy/Historical Pollutants color.gif 4,940
Spills/Dumping color.gif 2,902
Recreation And Tourism (Non-Boating) color.gif 1,511
Aquaculture color.gif 304
Groundwater Loadings/Withdrawals color.gif 270
Recreational Boating And Marinas color.gif 142
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 17,904,199
Unassessed 23,761,850
Total Acres 41,666,049







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

17,904,199.0 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 5,826,739
Threatened 19,760
Impaired 12,057,700
Total Acres Assessed 17,904,199

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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
Aquatic Life Harvesting Aquatic Life Harvesting 10,013,580 25.5 .0 74.5 color.gifcolor.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 9,784,029 58.9 .1 40.9 color.gifcolor.gifcolor.gif
Recreation Recreation 8,201,555 87.1 .2 12.7 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 6,469,384 81.6 .0 18.4 color.gifcolor.gif
Agricultural Agricultural 5,123,470 95.6 .0 4.4 color.gifcolor.gif
Industrial Industrial 3,318,752 99.9 .0 .1 color.gifcolor.gif
Hydropower Generation Other 2,520,363 87.4 .0 12.6 color.gifcolor.gif
Aesthetic Value Aesthetic Value 1,219,164 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 7,568,415
Nutrients color.gif 3,111,638
Polychlorinated Biphenyls (PCBs) color.gif 2,848,252
Turbidity color.gif 1,467,234
Organic Enrichment/Oxygen Depletion color.gif 1,376,656
Metals (other than Mercury) color.gif 942,690
pH/Acidity/Caustic Conditions color.gif 897,696
Algal Growth color.gif 888,938
Sediment color.gif 704,495
Nuisance Exotic Species color.gif 675,737
Fish Consumption Advisory color.gif 501,212
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 452,474
Habitat Alterations color.gif 288,060
Other Cause color.gif 267,777
Pesticides color.gif 235,000
Temperature color.gif 218,251
Ammonia color.gif 208,367
Flow Alteration(s) color.gif 182,447
Pathogens color.gif 168,938
Taste, Color and Odor color.gif 162,655
Dioxins color.gif 119,568
Cause Unknown color.gif 95,325
Cause Unknown - Impaired Biota color.gif 57,780
Noxious Aquatic Plants color.gif 53,462
Nuisance Native Species color.gif 27,318
Biotoxins color.gif 17,628
Total Toxics color.gif 12,714
Cause Unknown - Fish Kills color.gif 9,391
Toxic Organics color.gif 5,812
Toxic Inorganics color.gif 4,268
Trash color.gif 1,718
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 4,830,468
Unknown color.gif 3,141,961
Agriculture color.gif 905,204
Legacy/Historical Pollutants color.gif 747,461
Natural/Wildlife color.gif 722,565
Other color.gif 661,832
Unspecified Nonpoint Source color.gif 582,964
Hydromodification color.gif 576,637
Municipal Discharges/Sewage color.gif 561,845
Urban-Related Runoff/Stormwater color.gif 522,320
Resource Extraction color.gif 377,832
Industrial color.gif 203,706
Construction color.gif 202,812
Spills/Dumping color.gif 202,719
Silviculture (Forestry) color.gif 135,251
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 133,323
Recreation And Tourism (Non-Boating) color.gif 107,461
Land Application/Waste Sites/Tanks color.gif 44,096
Recreational Boating And Marinas color.gif 24,196
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 32,655
Unassessed 55,135
Total Square Miles 87,791







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Description of this table

Assessed
Bays and Estuaries

32,655.1 Square Miles of
Assessed Bays and Estuaries

Good 9,425
Threatened 0
Impaired 23,230
Total Square Miles Assessed 32,655

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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 23,453 24.6 .0 75.4 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 19,400 42.0 .0 58.0 color.gifcolor.gif
Recreation Recreation 13,553 68.6 .0 31.4 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 175 89.5 .0 10.5 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 10,809
Polychlorinated Biphenyls (PCBs) color.gif 7,304
Pathogens color.gif 6,157
Organic Enrichment/Oxygen Depletion color.gif 5,013
Dioxins color.gif 4,418
Other Cause color.gif 3,642
Fish Consumption Advisory color.gif 3,084
Noxious Aquatic Plants color.gif 1,855
Pesticides color.gif 1,766
Metals (other than Mercury) color.gif 1,584
Algal Growth color.gif 1,412
Cause Unknown - Impaired Biota color.gif 1,178
Nutrients color.gif 687
Nuisance Exotic Species color.gif 656
Turbidity color.gif 378
Total Toxics color.gif 333
Trash color.gif 288
Sediment color.gif 223
pH/Acidity/Caustic Conditions color.gif 95
Toxic Organics color.gif 78
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 44
Cause Unknown color.gif 40
Temperature color.gif 35
Ammonia color.gif 31
Oil and Grease color.gif 16
Toxic Inorganics color.gif 6
Taste, Color and Odor color.gif 6
Flow Alteration(s) color.gif 1
Habitat Alterations color.gif 1

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National Summary
Probable Sources of Impairments in Assessed Bays and Estuaries

Description of this table
Atmospheric Deposition color.gif 8,026
Unknown color.gif 5,773
Municipal Discharges/Sewage color.gif 4,987
Industrial color.gif 4,239
Other color.gif 3,825
Natural/Wildlife color.gif 3,521
Spills/Dumping color.gif 3,137
Unspecified Nonpoint Source color.gif 2,833
Agriculture color.gif 2,557
Urban-Related Runoff/Stormwater color.gif 2,283
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 2,057
Hydromodification color.gif 1,940
Legacy/Historical Pollutants color.gif 1,516
Resource Extraction color.gif 780
Recreational Boating And Marinas color.gif 525
Commercial Harbor And Port Activities color.gif 495
Land Application/Waste Sites/Tanks color.gif 52
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 8,421
Unassessed 50,197
Total Miles 58,618







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Description of this table

Assessed
Coastal Shoreline

8,421.1 Miles of
Assessed Coastal Shoreline

Good 1,216
Threatened 0
Impaired 7,205
Total Miles Assessed 8,421

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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 7,399 9.0 .0 91.0 color.gifcolor.gif
Recreation Recreation 1,663 76.2 .0 23.8 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 815 68.1 .0 31.9 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 6,473
Pathogens color.gif 1,083
Organic Enrichment/Oxygen Depletion color.gif 423
Turbidity color.gif 129
Nutrients color.gif 124
Algal Growth color.gif 91
Polychlorinated Biphenyls (PCBs) color.gif 76
Cause Unknown - Impaired Biota color.gif 70
pH/Acidity/Caustic Conditions color.gif 69
Metals (other than Mercury) color.gif 62
Other Cause color.gif 45
Pesticides color.gif 44
Ammonia color.gif 21
Temperature color.gif 20
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 468
Atmospheric Deposition color.gif 388
Municipal Discharges/Sewage color.gif 327
Urban-Related Runoff/Stormwater color.gif 271
Hydromodification color.gif 136
Unspecified Nonpoint Source color.gif 135
Industrial color.gif 126
Agriculture color.gif 126
Recreational Boating And Marinas color.gif 35
Construction color.gif 20
Spills/Dumping color.gif 13
Land Application/Waste Sites/Tanks color.gif 11
Legacy/Historical Pollutants color.gif 8
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 1,113,893
Unassessed 106,586,107
Total Acres 107,700,000







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Description of this table

Assessed
Wetlands

1,113,893.3 Acres of
Assessed Wetlands

Good 574,624
Threatened 0
Impaired 539,270
Total Acres Assessed 1,113,893

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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 1,103,482 57.9 .0 42.1 color.gifcolor.gif
Recreation Recreation 1,044,220 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 10,886
Algal Growth color.gif 4,731
Flow Alteration(s) color.gif 4,037
Turbidity color.gif 3,915
Nuisance Exotic Species color.gif 2,204
Habitat Alterations color.gif 1,754
Nutrients color.gif 1,720
Cause Unknown - Fish Kills color.gif 1,034
Fish Consumption Advisory color.gif 1,000
Cause Unknown 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
Other Cause color.gif 678
Trash color.gif 458
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 299
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 72,799
Recreational Boating And Marinas color.gif 72,320
Resource Extraction color.gif 32,215
Natural/Wildlife color.gif 8,332
Hydromodification color.gif 7,090
Land Application/Waste Sites/Tanks color.gif 1,138
Unspecified Nonpoint Source color.gif 1,098
Construction color.gif 1,000
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
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 3,472
Dioxins color.gif 2,963
Mercury color.gif 2,194
Pesticides color.gif 1,975
Pathogens color.gif 492
Nutrients color.gif 315
Nuisance Exotic Species color.gif 290
Sediment color.gif 290
Fish Consumption Advisory color.gif 285
Habitat Alterations color.gif 170
Other Cause color.gif 152
Organic Enrichment/Oxygen Depletion color.gif 120
Algal Growth color.gif 25
Toxic Inorganics color.gif 5

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National Summary
Probable Sources of Impairments in Assessed Great Lakes Shoreline

Description of this table
Atmospheric Deposition color.gif 3,400
Agriculture color.gif 536
Legacy/Historical Pollutants color.gif 427
Unknown color.gif 141
Municipal Discharges/Sewage color.gif 120
Land Application/Waste Sites/Tanks color.gif 31
Industrial color.gif 31
Unspecified Nonpoint Source color.gif 8
Hydromodification color.gif 7
Urban-Related Runoff/Stormwater color.gif 2
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
Hydropower Generation Other 39,031 100.0 .0 .0 color.gif
Industrial Industrial 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 5,993 888,938 1,412 91   4,731 25  
Ammonia 12,043 208,367 31 21 1 0    
Biotoxins 2,150 17,628            
Cause Unknown 40,496 95,325 40     1,000    
Cause Unknown - Fish Kills 688 9,391       1,034    
Cause Unknown - Impaired Biota 38,018 57,780 1,178 70   973    
Chlorine 621              
Dioxins 4,322 119,568 4,418   9   2,963 38,862
Fish Consumption Advisory 10,267 501,212 3,084 0   1,000 285 14,087
Flow Alteration(s) 40,862 182,447 1     4,037    
Habitat Alterations 63,308 288,060 1   10 1,754 170  
Mercury 64,469 7,568,415 10,809 6,473 796 246,160 2,194 29,968
Metals (other than Mercury) 75,261 942,690 1,584 62 15 26,248    
Noxious Aquatic Plants 343 53,462 1,855     940    
Nuisance Exotic Species 1,440 675,737 656   35 2,204 290 25
Nuisance Native Species 127 27,318            
Nutrients 99,466 3,111,638 687 124 7 1,720 315  
Oil and Grease 2,809 1,321 16 13        
Organic Enrichment/Oxygen Depletion 85,464 1,376,656 5,013 423 579 396,167 120 13,867
Other Cause 12,318 267,777 3,642 45   678 152  
Pathogens 160,084 168,938 6,157 1,083 81 72,349 492  
Pesticides 17,072 235,000 1,766 44 567 0 1,975 29,661
pH/Acidity/Caustic Conditions 28,424 897,696 95 69 7 838    
Polychlorinated Biphenyls (PCBs) 78,332 2,848,252 7,304 76 531 707 3,472 39,183
Radiation 677 48            
Salinity/Total Dissolved Solids/Chlorides/Sulfates 33,975 452,474 44     299    
Sediment 124,919 704,495 223 5   10,886 290  
Taste, Color and Odor 605 162,655 6          
Temperature 67,431 218,251 35 20 1 14,900    
Total Toxics 9,118 12,714 333   29 0   192
Toxic Inorganics 7,890 4,268 6     28,053 5  
Toxic Organics 4,474 5,812 78   14 0    
Trash 761 1,718 288     458    
Turbidity 28,714 1,467,234 378 129 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 125,220 905,204 2,557 126   201,776 536 4,373
Aquaculture 304 4,620 0 5        
Atmospheric Deposition 99,648 4,830,468 8,026 388 777 200,741 3,400 53,270
Commercial Harbor And Port Activities     495   0      
Construction 12,716 202,812 4 20 4 1,000    
Groundwater Loadings/Withdrawals 270 438 0          
Habitat Alterations (Not Directly Related To Hydromodification) 33,732 133,323 2,057          
Hydromodification 57,997 576,637 1,940 136 7 7,090 7  
Industrial 16,060 203,706 4,239 126 4 195,980 31  
Land Application/Waste Sites     1          
Land Application/Waste Sites/Tanks 8,168 44,096 52 11   1,138 31  
Legacy/Historical Pollutants 4,940 747,461 1,516 8     427 13,991
Military Bases 42 2,639            
Municipal Discharges/Sewage 53,919 561,845 4,987 327 114 72,799 120  
Natural/Wildlife 52,365 722,565 3,521 1 1 8,332 0  
Other 9,231 661,832 3,825     237   25
Recreation And Tourism (Non-Boating) 1,511 107,461 10 0 5      
Recreational Boating And Marinas 142 24,196 525 35 8 72,320    
Resource Extraction 28,809 377,832 780 0   32,215    
Silviculture (Forestry) 19,562 135,251 0          
Spills/Dumping 2,902 202,719 3,137 13 2      
Unknown 101,886 3,141,961 5,773 468 604 333,053 141 310
Unspecified Nonpoint Source 48,270 582,964 2,833 135 4 1,098 8  
Urban-Related Runoff/Stormwater 56,126 522,320 2,283 271 453 104 2 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 23 24
2003 color.gif 4 7
2004 color.gif 159 207
2005 color.gif 107 238
2006 color.gif 85 101
2007 color.gif 233 399
2008 color.gif 339 423
2009 color.gif 318 518
2010 color.gif 344 429
2011 color.gif 252 307
2012 color.gif 249 369
2013 color.gif 17 18

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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 79
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 1,330
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 330
Nevada color.gif 215
New Hampshire color.gif 1,449
New Jersey color.gif 716
New Mexico color.gif 209
New York color.gif 528
North Carolina color.gif 1,270
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 165
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: 41,586 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
Pathogens color.gif 12,188 12,480
Metals (other than Mercury) color.gif 9,231 9,420
Mercury color.gif 7,150 7,178
Nutrients color.gif 5,710 6,840
Sediment color.gif 3,863 4,484
Temperature color.gif 2,248 2,258
Organic Enrichment/Oxygen Depletion color.gif 2,127 2,247
pH/Acidity/Caustic Conditions color.gif 1,890 1,949
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,635 1,693
Turbidity color.gif 1,486 1,691
Pesticides color.gif 1,207 1,306
Ammonia color.gif 1,106 1,170
Polychlorinated Biphenyls (PCBs) color.gif 491 512
Chlorine color.gif 335 341
Other Cause color.gif 268 323
Toxic Inorganics color.gif 204 204
Toxic Organics color.gif 158 199
Cause Unknown - Impaired Biota color.gif 128 132
Total Toxics color.gif 110 120
Algal Growth color.gif 87 95
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: 51,872 TMDLs; 54,901 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 295
Alaska color.gif 55
American Samoa color.gif 2
Arizona color.gif 88
Arkansas color.gif 317
California color.gif 1,637
Colorado color.gif 1,005
Connecticut color.gif 372
Delaware color.gif 579
District Of Columbia color.gif 371
Florida color.gif 1,059
Georgia color.gif 1,694
Guam color.gif 18
Hawaii color.gif 64
Idaho color.gif 2,109
Illinois color.gif 427
Indiana color.gif 1,123
Iowa color.gif 201
Kansas color.gif 3,181
Kentucky color.gif 302
Louisiana color.gif 750
Maine color.gif 337
Maryland color.gif 792
Massachusetts color.gif 581
Michigan color.gif 238
Minnesota color.gif 1,569
Mississippi color.gif 1,439
Missouri color.gif 288
Montana color.gif 1,243
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 254
North Dakota color.gif 131
Ohio color.gif 1,678
Oklahoma color.gif 636
Oregon color.gif 1,241
Pennsylvania color.gif 7,094
Puerto Rico color.gif 321
Rhode Island color.gif 209
South Carolina color.gif 515
South Dakota color.gif 325
Tennessee color.gif 1,240
Texas color.gif 247
Utah color.gif 311
Vermont color.gif 119
Virgin Islands color.gif 66
Virginia color.gif 1,441
Washington color.gif 1,486
West Virginia color.gif 3,948
Wisconsin color.gif 247
Wyoming color.gif 363

Total: 51,872 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 4,210 4,563
2007 color.gif 4,321 4,651
2008 color.gif 9,262 9,545
2009 color.gif 4,402 4,628
2010 color.gif 2,567 2,703
2011 color.gif 2,830 3,113
2012 color.gif 2,883 3,151
2013 color.gif 2,359 2,447
2014 color.gif 259 270

Total: 51,872 TMDLs; 54,901 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 2008 2008
Arkansas 2008 2008
California 2010 2010
Colorado 2010 2010
Connecticut 2012 2012
Delaware 2006 2006
District Of Columbia 2010 2010
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 2012 2012
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 2012 2012
Nevada 2010 2010
New Hampshire 2010 2010
New Jersey 2010 2010
New Mexico 2012 2012
New York 2010 2010
North Carolina 2010 2010
North Dakota 2012 2012
Ohio 2010 2008
Oklahoma 2012 2012
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 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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