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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
 
    464,428 5,928,815 6,687 1,287 1,041 1,304,892 75 62
    6,355 47,330 17     805    
    462,601 11,600,032 11,740 791 4,856 746,163 1,110 56,647
933,384 17,576,176 18,444 2,078 5,897 2,051,861 1,184 56,709
3,533,205 41,666,049 87,791 58,618 54,120 107,700,000 5,202 60,546
26.4 42.2 21.0 3.5 10.9 1.9 22.8 93.7

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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
Assessed 933,384
Unassessed 2,599,821
Total Miles 3,533,205







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Description of this table
Good 464,428
Threatened 6,355
Impaired 462,601
Total Miles Assessed 933,384

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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 300,584 56.5 .5 43.0 color.gifcolor.gifcolor.gif
Recreation Recreation 118,095 69.9 1.4 28.7 color.gifcolor.gifcolor.gif
Agricultural Agricultural 117,128 87.3 1.4 11.3 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 86,013 80.6 1.7 17.7 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 43,794 25.9 2.0 72.1 color.gifcolor.gifcolor.gif
Industrial Industrial 28,236 66.2 .2 33.6 color.gifcolor.gifcolor.gif
Hydropower Generation Other 14,869 7.4 1.7 90.8 color.gifcolor.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 12,813 3.6 5.0 91.4 color.gifcolor.gifcolor.gif
Aesthetic Value Aesthetic Value 3,654 69.5 .0 30.5 color.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Rivers and Streams

Description of this table
Pathogens color.gif 141,491
Sediment color.gif 107,397
Nutrients color.gif 101,316
Organic Enrichment/Oxygen Depletion color.gif 83,352
Habitat Alterations color.gif 82,442
Polychlorinated Biphenyls (PCBs) color.gif 73,064
Metals (other than Mercury) color.gif 64,344
Flow Alteration(s) color.gif 56,391
Mercury color.gif 46,891
Temperature color.gif 46,738
Cause Unknown color.gif 35,394
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 31,656
Cause Unknown - Impaired Biota color.gif 30,954
pH/Acidity/Caustic Conditions color.gif 27,746
Turbidity color.gif 27,032
Pesticides color.gif 16,599
Other Cause color.gif 16,420
Ammonia color.gif 14,113
Fish Consumption Advisory color.gif 9,209
Toxic Inorganics color.gif 6,225
Dioxins color.gif 6,166
Algal Growth color.gif 5,840
Toxic Organics color.gif 3,658
Oil and Grease color.gif 3,654
Total Toxics color.gif 3,208
Nuisance Exotic Species color.gif 994
Taste, Color and Odor color.gif 942
Radiation color.gif 814
Chlorine color.gif 663
Cause Unknown - Fish Kills color.gif 450
Trash color.gif 370
Noxious Aquatic Plants color.gif 295
Nuisance Native Species color.gif 38
Biotoxins color.gif 23

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National Summary
Probable Sources of Impairments in Assessed Rivers and Streams

Description of this table
Agriculture color.gif 103,577
Unknown color.gif 77,611
Atmospheric Deposition color.gif 64,088
Hydromodification color.gif 59,899
Natural/Wildlife color.gif 53,423
Unspecified Nonpoint Source color.gif 44,338
Municipal Dishcarges/Sewage color.gif 37,949
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 33,015
Urban-Related Runoff/Stormwater color.gif 32,043
Resource Extraction color.gif 25,438
Silviculture (Forestry) color.gif 19,428
Construction color.gif 12,533
Industrial color.gif 9,924
Other color.gif 8,560
Land Application/Waste Sites/Tanks color.gif 8,003
Legacy/Historical Pollutants color.gif 4,191
Spills/Dumping color.gif 1,698
Recreation And Tourism (Non-Boating) color.gif 1,668
Aquaculture color.gif 1,055
Groundwater Loadings/Withdrawals color.gif 181
Recreational Boating And Marinas color.gif 147
Military Bases color.gif 42

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

Description of this table
Assessed 17,576,176
Unassessed 24,089,873
Total Acres 41,666,049







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Description of this table
Good 5,928,815
Threatened 47,330
Impaired 11,600,032
Total Acres Assessed 17,576,176

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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 3,399,558 29.6 .7 69.7 color.gifcolor.gifcolor.gif
Recreation Recreation 2,229,040 47.8 3.5 48.7 color.gifcolor.gifcolor.gif
Public Water Supply Public Water Supply 1,926,021 53.8 2.1 44.1 color.gifcolor.gifcolor.gif
Agricultural Agricultural 1,525,560 68.6 2.5 28.9 color.gifcolor.gifcolor.gif
Industrial Industrial 1,323,247 64.1 .2 35.7 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 1,199,532 19.4 5.0 75.6 color.gifcolor.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 732,768 16.1 15.6 68.3 color.gifcolor.gifcolor.gif
Hydropower Generation Other 690,152 4.8 1.4 93.8 color.gifcolor.gifcolor.gif
Aesthetic Value Aesthetic Value 356,026 3.0 .0 97.0 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 6,363,574
Polychlorinated Biphenyls (PCBs) color.gif 2,674,268
Nutrients color.gif 2,454,436
Organic Enrichment/Oxygen Depletion color.gif 1,948,125
Metals (other than Mercury) color.gif 1,175,677
Algal Growth color.gif 1,054,028
Turbidity color.gif 1,008,887
Sediment color.gif 720,243
Nuisance Exotic Species color.gif 650,335
Temperature color.gif 551,724
pH/Acidity/Caustic Conditions color.gif 518,354
Flow Alteration(s) color.gif 517,765
Fish Consumption Advisory color.gif 485,488
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 477,875
Pathogens color.gif 445,009
Habitat Alterations color.gif 443,640
Pesticides color.gif 372,020
Nuisance Native Species color.gif 277,458
Taste, Color and Odor color.gif 114,086
Dioxins color.gif 106,378
Toxic Organics color.gif 94,158
Noxious Aquatic Plants color.gif 60,101
Other Cause color.gif 59,905
Cause Unknown color.gif 55,771
Cause Unknown - Impaired Biota color.gif 55,010
Ammonia color.gif 52,746
Radiation color.gif 48,264
Total Toxics color.gif 23,610
Toxic Inorganics color.gif 7,363
Biotoxins color.gif 6,147
Cause Unknown - Fish Kills color.gif 4,614
Oil and Grease color.gif 3,286
Trash color.gif 1,701

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

Description of this table
Atmospheric Deposition color.gif 3,772,604
Unknown color.gif 2,615,322
Agriculture color.gif 1,579,540
Natural/Wildlife color.gif 1,321,000
Hydromodification color.gif 1,240,011
Unspecified Nonpoint Source color.gif 815,722
Other color.gif 777,527
Legacy/Historical Pollutants color.gif 755,219
Urban-Related Runoff/Stormwater color.gif 716,406
Municipal Dishcarges/Sewage color.gif 642,654
Resource Extraction color.gif 509,934
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 359,247
Construction color.gif 300,827
Silviculture (Forestry) color.gif 247,865
Industrial color.gif 209,500
Spills/Dumping color.gif 176,699
Recreational Boating And Marinas color.gif 126,174
Commercial Harbor And Port Activities color.gif 109,240
Recreation And Tourism (Non-Boating) color.gif 108,069
Groundwater Loadings/Withdrawals color.gif 98,009
Land Application/Waste Sites/Tanks color.gif 80,284
Aquaculture color.gif 4,490
Military Bases color.gif 2

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National Summary
Water Quality Attainment in Assessed Bays and Estuaries

Description of this table
Assessed 18,444
Unassessed 69,347
Total Square Miles 87,791







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Description of this table
Good 6,687
Threatened 17
Impaired 11,740
Total Square Miles Assessed 18,444

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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
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 3,683 7.5 .5 92.1 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 927 .7 1.8 97.5 color.gifcolor.gifcolor.gif
Recreation Recreation 889 78.3 .1 21.6 color.gifcolor.gifcolor.gif
Industrial Industrial 570 74.1 .0 25.9 color.gifcolor.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 533 .8 .0 99.2 color.gifcolor.gif
Hydropower Generation Other 290 13.4 .0 86.6 color.gifcolor.gif
Public Water Supply Public Water Supply 182 9.9 .0 90.1 color.gifcolor.gif
Agricultural Agricultural 53 .0 .0 100.0 color.gif

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National Summary
Causes of Impairment in Assessed Bays and Estuaries

Description of this table
Organic Enrichment/Oxygen Depletion color.gif 3,601
Polychlorinated Biphenyls (PCBs) color.gif 3,240
Pathogens color.gif 3,043
Mercury color.gif 2,080
Noxious Aquatic Plants color.gif 1,924
Metals (other than Mercury) color.gif 1,480
Pesticides color.gif 1,380
Toxic Organics color.gif 995
Nutrients color.gif 819
Other Cause color.gif 642
Cause Unknown - Impaired Biota color.gif 412
Total Toxics color.gif 318
Flow Alteration(s) color.gif 299
Habitat Alterations color.gif 273
Cause Unknown color.gif 273
pH/Acidity/Caustic Conditions color.gif 250
Turbidity color.gif 239
Algal Growth color.gif 216
Sediment color.gif 209
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 141
Dioxins color.gif 121
Nuisance Exotic Species color.gif 92
Temperature color.gif 39
Ammonia color.gif 35
Trash color.gif 31
Oil and Grease color.gif 13
Toxic Inorganics color.gif 6
Taste, Color and Odor color.gif 3

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National Summary
Probable Sources of Impairments in Assessed Bays and Estuaries

Description of this table
Municipal Dishcarges/Sewage color.gif 4,500
Atmospheric Deposition color.gif 4,238
Unknown color.gif 3,977
Natural/Wildlife color.gif 3,789
Industrial color.gif 3,044
Agriculture color.gif 2,885
Hydromodification color.gif 2,532
Other color.gif 2,406
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 2,091
Urban-Related Runoff/Stormwater color.gif 1,994
Unspecified Nonpoint Source color.gif 1,773
Resource Extraction color.gif 582
Recreational Boating And Marinas color.gif 545
Commercial Harbor And Port Activities color.gif 481
Legacy/Historical Pollutants color.gif 254
Groundwater Loadings/Withdrawals color.gif 158
Land Application/Waste Sites/Tanks color.gif 52
Spills/Dumping color.gif 26
Construction color.gif 16
Recreation And Tourism (Non-Boating) 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
Assessed 2,078
Unassessed 56,540
Total Miles 58,618







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Description of this table
Good 1,287
Threatened 0
Impaired 791
Total Miles Assessed 2,078

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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
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 1,113 56.7 .0 43.3 color.gifcolor.gif
Recreation Recreation 711 77.5 .0 22.5 color.gifcolor.gif
Hydropower Generation Other 680 73.9 .0 26.1 color.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 643 82.4 .0 17.6 color.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 328 80.1 .0 19.9 color.gifcolor.gif
Industrial Industrial 303 79.5 .0 20.5 color.gifcolor.gif
Agricultural Agricultural 50 .0 .0 100.0 color.gif
Public Water Supply Public Water Supply 49 .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 338
Pathogens color.gif 277
Metals (other than Mercury) color.gif 249
Turbidity color.gif 69
Pesticides color.gif 67
Other Cause color.gif 55
Nutrients color.gif 42
Cause Unknown color.gif 42
Algal Growth color.gif 38
Organic Enrichment/Oxygen Depletion color.gif 38
Polychlorinated Biphenyls (PCBs) color.gif 34
Ammonia color.gif 13
Toxic Organics color.gif 13
Oil and Grease color.gif 13
pH/Acidity/Caustic Conditions color.gif 6
Temperature color.gif 3
Cause Unknown - Impaired Biota color.gif 0

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National Summary
Probable Sources of Impairments in Assessed Coastal Shoreline

Description of this table
Unspecified Nonpoint Source color.gif 101
Natural/Wildlife color.gif 100
Urban-Related Runoff/Stormwater color.gif 47
Municipal Dishcarges/Sewage color.gif 39
Industrial color.gif 37
Other color.gif 34
Commercial Harbor And Port Activities color.gif 20
Recreation And Tourism (Non-Boating) color.gif 20
Agriculture color.gif 16
Unknown color.gif 13
Spills/Dumping color.gif 13
Resource Extraction color.gif 12
Construction color.gif 3
Land Application/Waste Sites/Tanks color.gif 1
Recreational Boating And Marinas color.gif 1

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National Summary
Water Quality Attainment in Assessed Ocean and Near Coastal

Description of this table
Assessed 5,897
Unassessed 48,223
Total Square Miles 54,120







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Description of this table
Good 1,041
Threatened 0
Impaired 4,856
Total Square Miles Assessed 5,897

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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
Aquatic Life Harvesting Aquatic Life Harvesting 557 87.4 .0 12.6 color.gifcolor.gif
Recreation Recreation 491 99.2 .0 .8 color.gifcolor.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 490 99.9 .0 .1 color.gifcolor.gif
Public Water Supply Public Water Supply 224 100.0 .0 .0 color.gif
Hydropower Generation Other 100 99.4 .0 .6 color.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 99 100.0 .0 .0 color.gif
Industrial Industrial 3 100.0 .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 4,639
Polychlorinated Biphenyls (PCBs) color.gif 563
Organic Enrichment/Oxygen Depletion color.gif 542
Pesticides color.gif 487
Pathogens color.gif 84
Dioxins color.gif 79
Nuisance Exotic Species color.gif 35
Total Toxics color.gif 29
Metals (other than Mercury) color.gif 15
Toxic Organics color.gif 14
Turbidity color.gif 13
Habitat Alterations color.gif 10
Nutrients color.gif 8
pH/Acidity/Caustic Conditions 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
Unknown color.gif 283
Atmospheric Deposition color.gif 70
Municipal Dishcarges/Sewage color.gif 8
Recreational Boating And Marinas color.gif 8
Hydromodification color.gif 5
Recreation And Tourism (Non-Boating) color.gif 4
Unspecified Nonpoint Source color.gif 4
Urban-Related Runoff/Stormwater color.gif 4
Construction color.gif 3
Industrial color.gif 3
Spills/Dumping color.gif 2
Agriculture color.gif 1
Commercial Harbor And Port Activities color.gif 1
Natural/Wildlife color.gif 0

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National Summary
Water Quality Attainment in Assessed Wetlands

Description of this table
Assessed 2,051,861
Unassessed 105,648,139
Total Acres 107,700,000







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Description of this table
Good 1,304,892
Threatened 805
Impaired 746,163
Total Acres Assessed 2,051,861

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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 981,255 67.2 .1 32.7 color.gifcolor.gifcolor.gif
Exceptional Recreational or Ecological Significance Exceptional Recreational Or Ecological Significance 141,544 8.3 44.6 47.2 color.gifcolor.gifcolor.gif
Recreation Recreation 108,536 26.9 61.8 11.3 color.gifcolor.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 90,292 .2 .0 99.8 color.gifcolor.gif
Industrial Industrial 84,516 25.0 .0 75.0 color.gifcolor.gif
Public Water Supply Public Water Supply 82,403 19.1 .2 80.7 color.gifcolor.gifcolor.gif
Hydropower Generation Other 66,403 .0 .0 100.0 color.gif
Agricultural Agricultural 32,465 47.9 .6 51.5 color.gifcolor.gifcolor.gif

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National Summary
Causes of Impairment in Assessed Wetlands

Description of this table
Organic Enrichment/Oxygen Depletion color.gif 469,968
Mercury color.gif 225,786
Metals (other than Mercury) color.gif 166,952
Habitat Alterations color.gif 107,594
Nutrients color.gif 69,361
Pathogens color.gif 66,452
Flow Alteration(s) color.gif 33,054
Toxic Inorganics color.gif 21,473
Sediment color.gif 13,476
Total Toxics color.gif 12,659
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 11,363
pH/Acidity/Caustic Conditions color.gif 10,043
Temperature color.gif 7,680
Nuisance Exotic Species color.gif 5,300
Algal Growth color.gif 3,821
Turbidity color.gif 1,965
Cause Unknown color.gif 1,665
Fish Consumption Advisory color.gif 1,000
Noxious Aquatic Plants color.gif 940
Polychlorinated Biphenyls (PCBs) color.gif 707
Cause Unknown - Impaired Biota color.gif 678
Trash color.gif 458
Other Cause color.gif 371
Pesticides color.gif 362
Ammonia color.gif 140
Toxic Organics color.gif 133
Radiation color.gif 2

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National Summary
Probable Sources of Impairments in Assessed Wetlands

Description of this table
Agriculture color.gif 383,822
Unknown color.gif 210,159
Atmospheric Deposition color.gif 200,741
Industrial color.gif 195,980
Natural/Wildlife color.gif 133,558
Hydromodification color.gif 115,704
Resource Extraction color.gif 89,353
Other color.gif 65,874
Unspecified Nonpoint Source color.gif 63,901
Construction color.gif 13,971
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 8,017
Groundwater Loadings/Withdrawals color.gif 3,045
Land Application/Waste Sites/Tanks color.gif 1,634
Recreation And Tourism (Non-Boating) color.gif 787
Municipal Dishcarges/Sewage color.gif 458
Silviculture (Forestry) color.gif 2
Urban-Related Runoff/Stormwater color.gif 2

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National Summary
Water Quality Attainment in Assessed Great Lakes Shoreline

Description of this table
Assessed 1,184
Unassessed 4,018
Total Miles 5,202







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Description of this table
Good 75
Threatened 0
Impaired 1,110
Total Miles Assessed 1,184

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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
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 285 .0 .0 100.0 color.gif
Recreation Recreation 63 .0 .0 100.0 color.gif
Aquatic Life Harvesting Aquatic Life Harvesting 63 .0 .0 100.0 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 819
Pathogens color.gif 400
Dioxins color.gif 323
Pesticides color.gif 323
Nuisance Exotic Species color.gif 290
Nutrients color.gif 290
Sediment color.gif 290
Fish Consumption Advisory color.gif 285
Habitat Alterations color.gif 170
Organic Enrichment/Oxygen Depletion color.gif 120
Mercury color.gif 59
Algal Growth color.gif 8

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National Summary
Probable Sources of Impairments in Assessed Great Lakes Shoreline

Description of this table
Legacy/Historical Pollutants color.gif 682
Atmospheric Deposition color.gif 285
Unknown color.gif 134
Municipal Dishcarges/Sewage color.gif 27
Unspecified Nonpoint Source color.gif 9
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
Assessed 56,709
Unassessed 3,837
Total Square Miles 60,546







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Description of this table
Good 62
Threatened 0
Impaired 56,647
Total Square Miles Assessed 56,709

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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
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 14,300 1.5 .0 98.5 color.gifcolor.gif
Aquatic Life Harvesting Aquatic Life Harvesting 152 .0 .0 100.0 color.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 42,560
Dioxins color.gif 41,937
Mercury color.gif 31,961
Pesticides color.gif 29,944
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
Taste, Color and Odor color.gif 3
Nutrients color.gif 3

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

Description of this table
Atmospheric Deposition color.gif 56,254
Legacy/Historical Pollutants color.gif 15,128
Urban-Related Runoff/Stormwater color.gif 13,867
Agriculture color.gif 4,373
Unknown color.gif 554
Other color.gif 25
Municipal Dishcarges/Sewage color.gif 3
Unspecified Nonpoint Source color.gif 3
Industrial color.gif 3

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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.
Size of Assessed Waters with Listed Causes of Impairment
Algal Growth 5,840 1,054,028 216 38   3,821 8  
Ammonia 14,113 52,746 35 13 1 140    
Biotoxins 23 6,147            
Cause Unknown 35,394 55,771 273 42   1,665    
Cause Unknown - Fish Kills 450 4,614            
Cause Unknown - Impaired Biota 30,954 55,010 412 0   678    
Chlorine 663              
Dioxins 6,166 106,378 121   79   323 41,937
Fish Consumption Advisory 9,209 485,488   0   1,000 285 14,087
Flow Alteration(s) 56,391 517,765 299     33,054    
Habitat Alterations 82,442 443,640 273   10 107,594 170  
Mercury 46,891 6,363,574 2,080 338 4,639 225,786 59 31,961
Metals (other than Mercury) 64,344 1,175,677 1,480 249 15 166,952    
Noxious Aquatic Plants 295 60,101 1,924     940    
Nuisance Exotic Species 994 650,335 92   35 5,300 290 25
Nuisance Native Species 38 277,458            
Nutrients 101,316 2,454,436 819 42 8 69,361 290 3
Oil and Grease 3,654 3,286 13 13        
Organic Enrichment/Oxygen Depletion 83,352 1,948,125 3,601 38 542 469,968 120 13,867
Other Cause 16,420 59,905 642 55   371    
Pathogens 141,491 445,009 3,043 277 84 66,452 400  
Pesticides 16,599 372,020 1,380 67 487 362 323 29,944
pH/Acidity/Caustic Conditions 27,746 518,354 250 6 7 10,043    
Polychlorinated Biphenyls (PCBs) 73,064 2,674,268 3,240 34 563 707 819 42,560
Radiation 814 48,264       2    
Salinity/Total Dissolved Solids/Chlorides/Sulfates 31,656 477,875 141     11,363    
Sediment 107,397 720,243 209     13,476 290  
Taste, Color and Odor 942 114,086 3         3
Temperature 46,738 551,724 39 3 1 7,680    
Total Toxics 3,208 23,610 318   29 12,659   192
Toxic Inorganics 6,225 7,363 6     21,473    
Toxic Organics 3,658 94,158 995 13 14 133    
Trash 370 1,701 31     458    
Turbidity 27,032 1,008,887 239 69 13 1,965    

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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 103,577 1,579,540 2,885 16 1 383,822   4,373
Aquaculture 1,055 4,490 0          
Atmospheric Deposition 64,088 3,772,604 4,238   70 200,741 285 56,254
Commercial Harbor And Port Activities   109,240 481 20 1      
Construction 12,533 300,827 16 3 3 13,971    
Groundwater Loadings/Withdrawals 181 98,009 158     3,045    
Habitat Alterations (Not Directly Related To Hydromodification) 33,015 359,247 2,091     8,017    
Hydromodification 59,899 1,240,011 2,532   5 115,704    
Industrial 9,924 209,500 3,044 37 3 195,980   3
Land Application/Waste Sites/Tanks 8,003 80,284 52 1   1,634    
Legacy/Historical Pollutants 4,191 755,219 254       682 15,128
Military Bases 42 2            
Municipal Dishcarges/Sewage 37,949 642,654 4,500 39 8 458 27 3
Natural/Wildlife 53,423 1,321,000 3,789 100 0 133,558 0  
Other 8,560 777,527 2,406 34   65,874   25
Recreation And Tourism (Non-Boating) 1,668 108,069 0 20 4 787    
Recreational Boating And Marinas 147 126,174 545 1 8      
Resource Extraction 25,438 509,934 582 12   89,353    
Silviculture (Forestry) 19,428 247,865 0     2    
Spills/Dumping 1,698 176,699 26 13 2      
Unknown 77,611 2,615,322 3,977 13 283 210,159 134 554
Unspecified Nonpoint Source 44,338 815,722 1,773 101 4 63,901 9 3
Urban-Related Runoff/Stormwater 32,043 716,406 1,994 47 4 2 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 6
2004 color.gif 159 203
2005 color.gif 106 225
2006 color.gif 84 98
2007 color.gif 233 367
2008 color.gif 331 394
2009 color.gif 103 221

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Impaired Waters Listed By State

Description of this table
Alabama color.gif 200
Alaska color.gif 32
American Samoa color.gif 42
Arizona color.gif 68
Arkansas color.gif 224
California color.gif 691
Colorado color.gif 200
Connecticut color.gif 408
Delaware color.gif 101
District Of Columbia color.gif 27
Florida color.gif 827
Georgia color.gif 281
Guam color.gif 54
Hawaii color.gif 311
Idaho color.gif 1,056
Illinois color.gif 1,058
Indiana color.gif 1,836
Iowa color.gif 278
Kansas color.gif 1,333
Kentucky color.gif 1,089
Louisiana color.gif 250
Maine color.gif 206
Maryland color.gif 501
Massachusetts color.gif 837
Michigan color.gif 2,352
Minnesota color.gif 1,144
Mississippi color.gif 197
Missouri color.gif 0
Montana color.gif 677
N. Mariana Islands color.gif 71
Nebraska color.gif 177
Nevada color.gif 129
New Hampshire color.gif 5,211
New Jersey color.gif 745
New Mexico color.gif 187
New York color.gif 491
North Carolina color.gif 902
North Dakota color.gif 247
Ohio color.gif 267
Oklahoma color.gif 743
Oregon color.gif 1,397
Pennsylvania color.gif 6,957
Puerto Rico color.gif 166
Rhode Island color.gif 141
South Carolina color.gif 1,060
South Dakota color.gif 168
Tennessee color.gif 900
Texas color.gif 651
Utah color.gif 118
Vermont color.gif 131
Virgin Islands color.gif 77
Virginia color.gif 2,534
Washington color.gif 2,419
West Virginia color.gif 981
Wisconsin color.gif 593
Wyoming color.gif 106

Total: 43,849 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 7,653 7,881
Metals (other than Mercury) color.gif 6,928 7,064
Mercury color.gif 6,793 6,825
Nutrients color.gif 4,397 5,268
Sediment color.gif 3,372 3,900
Organic Enrichment/Oxygen Depletion color.gif 1,800 1,874
pH/Acidity/Caustic Conditions color.gif 1,601 1,637
Temperature color.gif 1,548 1,555
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,514 1,555
Ammonia color.gif 1,043 1,105
Pesticides color.gif 988 1,048
Turbidity color.gif 885 1,009
Polychlorinated Biphenyls (PCBs) color.gif 357 371
Chlorine color.gif 336 341
Other Cause color.gif 208 225
Toxic Inorganics color.gif 189 189
Cause Unknown - Impaired Biota color.gif 168 172
Toxic Organics color.gif 125 125
Total Toxics color.gif 94 102
Habitat Alterations color.gif 83 84
Algal Growth color.gif 65 69
Trash color.gif 65 68
Dioxins color.gif 24 25
Noxious Aquatic Plants color.gif 21 22
Radiation color.gif 21 22
Oil and Grease color.gif 12 13
Cause Unknown color.gif 5 5
Fish Consumption Advisory color.gif 2 2
Nuisance Exotic Species color.gif 2 2

Total: 40,299 TMDLs; 42,558 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 265
Alaska color.gif 44
American Samoa color.gif 2
Arizona color.gif 69
Arkansas color.gif 232
California color.gif 979
Colorado color.gif 955
Connecticut color.gif 109
Delaware color.gif 558
District Of Columbia color.gif 360
Florida color.gif 657
Georgia color.gif 1,554
Guam color.gif 1
Hawaii color.gif 49
Idaho color.gif 1,611
Illinois color.gif 302
Indiana color.gif 768
Iowa color.gif 136
Kansas color.gif 2,727
Kentucky color.gif 123
Louisiana color.gif 665
Maine color.gif 292
Maryland color.gif 607
Massachusetts color.gif 426
Michigan color.gif 160
Minnesota color.gif 1,166
Mississippi color.gif 1,310
Missouri color.gif 137
Montana color.gif 607
Nebraska color.gif 91
Nevada color.gif 58
New Hampshire color.gif 5,510
New Jersey color.gif 598
New Mexico color.gif 224
New York color.gif 638
North Carolina color.gif 145
North Dakota color.gif 69
Ohio color.gif 1,147
Oklahoma color.gif 223
Oregon color.gif 1,035
Pennsylvania color.gif 6,133
Puerto Rico color.gif 53
Rhode Island color.gif 104
South Carolina color.gif 425
South Dakota color.gif 269
Tennessee color.gif 1,039
Texas color.gif 154
Utah color.gif 301
Vermont color.gif 94
Virgin Islands color.gif 29
Virginia color.gif 970
Washington color.gif 1,120
West Virginia color.gif 2,561
Wisconsin color.gif 96
Wyoming color.gif 342

Total: 40,299 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 122 123
1997 color.gif 338 352
1998 color.gif 403 409
1999 color.gif 334 380
2000 color.gif 1,560 1,584
2001 color.gif 2,571 2,607
2002 color.gif 2,745 2,820
2003 color.gif 2,970 3,247
2004 color.gif 3,377 3,642
2005 color.gif 4,245 4,563
2006 color.gif 4,202 4,554
2007 color.gif 4,321 4,652
2008 color.gif 9,197 9,477
2009 color.gif 3,892 4,112
2010 color.gif 22 36

Total: 40,299 TMDLs; 42,558 Causes of Impairment Addressed

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Status of Available Data Used in This Report

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


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