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National Summary of
Impaired Waters and TMDL 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.





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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Causes of Impairment for 303(d) Listed Waters

Description of this table
NOTE: Click on a cause of impairment (e.g. pathogens) to see the specific state-reported causes that are grouped to make up this category. Click on the "Number of Causes of Impairment Reported" to see a list of waters with that cause of impairment.
Pathogens color.gif 10,468
Metals (other than Mercury) color.gif 7,442
Nutrients color.gif 6,912
Organic Enrichment/Oxygen Depletion color.gif 6,369
Sediment color.gif 6,161
Polychlorinated Biphenyls (PCBs) color.gif 5,637
Mercury color.gif 4,790
pH/Acidity/Caustic Conditions color.gif 4,194
Cause Unknown - Impaired Biota color.gif 3,673
Temperature color.gif 3,110
Turbidity color.gif 2,893
Pesticides color.gif 1,912
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,888
Cause Unknown color.gif 1,181
Algal Growth color.gif 1,052
Habitat Alterations color.gif 775
Dioxins color.gif 626
Total Toxics color.gif 452
Toxic Organics color.gif 402
Toxic Inorganics color.gif 385
Ammonia color.gif 381
Other Cause color.gif 288
Oil and Grease color.gif 136
Flow Alteration(s) color.gif 128
Taste, Color and Odor color.gif 123
Fish Consumption Advisory color.gif 97
Noxious Aquatic Plants color.gif 89
Biotoxins color.gif 87
Cause Unknown - Fish Kills color.gif 69
Trash color.gif 68
Radiation color.gif 52
Chlorine color.gif 40
Nuisance Exotic Species color.gif 34
Nuisance Native Species color.gif 3

Total: 71,917 Causes of Impairment

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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 12,183 12,474
Metals (other than Mercury) color.gif 9,219 9,407
Mercury color.gif 7,150 7,178
Nutrients color.gif 5,705 6,834
Sediment color.gif 3,863 4,481
Temperature color.gif 2,193 2,203
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 1,204 1,302
Ammonia color.gif 1,106 1,170
Polychlorinated Biphenyls (PCBs) color.gif 490 511
Chlorine color.gif 335 341
Other Cause color.gif 268 323
Toxic Inorganics color.gif 202 202
Toxic Organics color.gif 158 199
Cause Unknown - Impaired Biota color.gif 128 132
Total Toxics color.gif 105 114
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: 51,784 TMDLs; 54,805 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 1,625
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 2,054
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 190
South Carolina color.gif 513
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: 51,784 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 2,442
2014 color.gif 171 179

Total: 51,784 TMDLs; 54,805 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


TMDL Document Search


Full Text Search of TMDL Documents

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