Jump to main content.

Return to home page

On This Page

For More Information:

Download Excel compatible information

Download GIS Information (Internet Explorer only)

Region 3 Summary of State Information

Map of the Region 3 Connecticut Maine Massachusetts New Hampshire Rhode Island Vermont New Jersey New York Puerto Rico U.S. Virgin Islands Delaware District of Columbia Maryland Pennsylvania Virginia West Virginia Alabama Florida Georgia Kentucky Mississippi North Carolina South Carolina Tennessee Illinois Indiana Michigan Minnesota Ohio Wisconsin Arkansas Louisiana New Mexico Oklahoma Texas Iowa Kansas Missouri Nebraska Colorado Montana North Dakota South Dakota Utah Wyoming Arizona California Hawaii Nevada Alaska Idaho Oregon Washington

Depicted below are regional 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.


Frequent Questions


Assessed Waters of Region 3

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

Description of this table
  Size of Water
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)		 Coastal
Shoreline
(Miles)
   Good Waters 85,641 29,226 368 25
   Threatened Waters
   Impaired Waters 43,396 126,314 4,471  
Total Assessed Waters 129,037 155,540 4,839 25
Total Waters 177,290 414,957 5,477 57
Percent of Waters Assessed 72.8 37.5 88.4 43.9

Top of page

Summary of Water Quality Assessments for Each Waterbody Type


Region 3
Water Quality Attainment in Assessed Rivers and Streams

Description of this table
Assessed Status Miles
Assessed 129,037
Unassessed 48,253
Total Miles 177,290







arrow pointing right 		Description of this table
Attainment Status Miles
Good 85,641
Threatened 0
Impaired 43,396
Total Miles Assessed 129,037

Top of page

Region 3
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
Designated Use Group Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 92,090 77.5 .0 22.5 color.gifcolor.gif
Recreation Recreation 2,764 14.2 .0 85.8 color.gifcolor.gif
Industrial Industrial 2,449 100.0 .0 .0 color.gif
Aquatic Life Harvesting Aquatic Life Harvesting 2,227 26.1 .0 73.9 color.gifcolor.gif
Agricultural Agricultural 1,928 100.0 .0 .0 color.gif
Public Water Supply Public Water Supply 472 77.5 .0 22.5 color.gifcolor.gif

Top of page

Region 3
Causes of Impairment in Assessed Rivers and Streams

Description of this table
Cause of Impairment Group Miles
Threatened or
Impaired
Pathogens color.gif 13,661
Metals (other than Mercury) color.gif 9,650
Sediment color.gif 8,188
Cause Unknown - Impaired Biota color.gif 7,137
pH/Acidity/Caustic Conditions color.gif 5,467
Nutrients color.gif 4,886
Polychlorinated Biphenyls (PCBs) color.gif 3,110
Organic Enrichment/Oxygen Depletion color.gif 2,979
Mercury color.gif 2,974
Flow Alteration(s) color.gif 1,865
Cause Unknown color.gif 1,020
Habitat Alterations color.gif 844
Temperature color.gif 681
Dioxins color.gif 473
Pesticides color.gif 291
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 245
Turbidity color.gif 229
Algal Growth color.gif 127
Total Toxics color.gif 89
Toxic Organics color.gif 81
Toxic Inorganics color.gif 80
Ammonia color.gif 49
Oil and Grease color.gif 41
Taste, Color and Odor color.gif 17
Trash color.gif 15
Chlorine color.gif 9
Noxious Aquatic Plants color.gif 5

Top of page

Region 3
Probable Sources of Impairments in Assessed Rivers and Streams

Description of this table
Probable Source Group Miles
Threatened or
Impaired
Agriculture color.gif 9,417
Unknown color.gif 7,808
Resource Extraction color.gif 5,918
Natural/Wildlife color.gif 5,341
Urban-Related Runoff/Stormwater color.gif 4,642
Municipal Dishcarges/Sewage color.gif 2,783
Unspecified Nonpoint Source color.gif 1,884
Hydromodification color.gif 1,427
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 1,196
Atmospheric Deposition color.gif 1,076
Other color.gif 938
Industrial color.gif 677
Construction color.gif 399
Legacy/Historical Pollutants color.gif 197
Land Application/Waste Sites/Tanks color.gif 166
Recreation And Tourism (Non-Boating) color.gif 51
Silviculture (Forestry) color.gif 36
Spills/Dumping color.gif 21
Aquaculture color.gif 3

Top of page

Region 3
Water Quality Attainment in Assessed Lakes, Reservoirs, and Ponds

Description of this table
Assessed Status Acres
Assessed 155,540
Unassessed 259,417
Total Acres 414,957







arrow pointing right 		Description of this table
Attainment Status Acres
Good 29,226
Threatened 0
Impaired 126,314
Total Acres Assessed 155,540

Top of page

Region 3
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
Designated Use Group Acres Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 21,630 23.4 .0 76.6 color.gifcolor.gif
Industrial Industrial 2,954 100.0 .0 .0 color.gif
Recreation Recreation 2,954 46.3 .0 53.7 color.gifcolor.gif
Agricultural Agricultural 2,765 100.0 .0 .0 color.gif
Public Water Supply Public Water Supply 296 100.0 .0 .0 color.gif

Top of page

Region 3
Causes of Impairment in Assessed Lakes, Reservoirs, and Ponds

Description of this table
Cause of Impairment Group Acres
Threatened or
Impaired
Polychlorinated Biphenyls (PCBs) color.gif 81,698
Organic Enrichment/Oxygen Depletion color.gif 58,485
Mercury color.gif 50,694
Pathogens color.gif 6,283
pH/Acidity/Caustic Conditions color.gif 5,132
Nutrients color.gif 2,694
Metals (other than Mercury) color.gif 628
Sediment color.gif 193
Dioxins color.gif 158
Oil and Grease color.gif 103
Temperature color.gif 99
Pesticides color.gif 27

Top of page

Region 3
Probable Sources of Impairments in Assessed Lakes, Reservoirs, and Ponds

Description of this table
Probable Source Group Acres
Threatened or
Impaired
Unknown color.gif 91,663
Natural/Wildlife color.gif 6,733
Urban-Related Runoff/Stormwater color.gif 1,891
Hydromodification color.gif 1,687
Atmospheric Deposition color.gif 1,561
Agriculture color.gif 1,532
Municipal Dishcarges/Sewage color.gif 1,393
Other color.gif 103
Unspecified Nonpoint Source color.gif 88
Resource Extraction color.gif 26

Top of page

Region 3
Water Quality Attainment in Assessed Bays and Estuaries

Description of this table
Assessed Status Square Miles
Assessed 4,839
Unassessed 637
Total Square Miles 5,477







arrow pointing right 		Description of this table
Attainment Status Square Miles
Good 368
Threatened 0
Impaired 4,471
Total Square Miles Assessed 4,839

Top of page

Region 3
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
Designated Use Group Square Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 2,528 9.7 .0 90.3 color.gifcolor.gif
Recreation Recreation 30 10.2 .0 89.8 color.gifcolor.gif
Industrial Industrial 29 100.0 .0 .0 color.gif
Aquatic Life Harvesting Aquatic Life Harvesting 15 4.1 .0 95.9 color.gifcolor.gif

Top of page

Region 3
Causes of Impairment in Assessed Bays and Estuaries

Description of this table
Cause of Impairment Group Square Miles
Threatened or
Impaired
Polychlorinated Biphenyls (PCBs) color.gif 2,063
Noxious Aquatic Plants color.gif 1,916
Organic Enrichment/Oxygen Depletion color.gif 1,884
Cause Unknown - Impaired Biota color.gif 388
Algal Growth color.gif 202
Pathogens color.gif 194
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 141
Nutrients color.gif 37
Sediment color.gif 12
Toxic Organics color.gif 12
Mercury color.gif 8
pH/Acidity/Caustic Conditions color.gif 6
Total Toxics color.gif 1
Temperature color.gif 1
Oil and Grease color.gif 1

Top of page

Region 3
Probable Sources of Impairments in Assessed Bays and Estuaries

Description of this table
Probable Source Group Square Miles
Threatened or
Impaired
Municipal Dishcarges/Sewage color.gif 2,148
Natural/Wildlife color.gif 2,121
Industrial color.gif 2,117
Unknown color.gif 2,110
Agriculture color.gif 2,103
Atmospheric Deposition color.gif 2,095
Habitat Alterations (Not Directly Related To Hydromodification) color.gif 2,091
Other color.gif 2,090
Hydromodification color.gif 1,916
Urban-Related Runoff/Stormwater color.gif 305
Unspecified Nonpoint Source color.gif 261
Legacy/Historical Pollutants color.gif 36
Commercial Harbor And Port Activities color.gif 11
Recreational Boating And Marinas color.gif 0
Spills/Dumping color.gif 0

Top of page

Region 3
Water Quality Attainment in Assessed Coastal Shoreline

Description of this table
Assessed Status Miles
Assessed 25
Unassessed 32
Total Miles 57







arrow pointing right 		Description of this table
Attainment Status Miles
Good 25
Threatened 0
Impaired 0
Total Miles Assessed 25

Top of page

Region 3
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
Designated Use Group Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Industrial Industrial 25 100.0 .0 .0 color.gif
Recreation Recreation 25 100.0 .0 .0 color.gif
Fish, Shellfish, and Wildlife Protection and Propagation Fish, Shellfish, And Wildlife Protection And Propagation 25 100.0 .0 .0 color.gif

Top of page

Region 3
Causes of Impairment in Assessed Coastal Shoreline

No causes of impairment reported.

Top of page

Region 3
Probable Sources of Impairments in Assessed Coastal Shoreline

No probable sources of impairments reported.

Top of page


Region 3 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.
Cause of Impairment Group Size of Assessed Waters with Listed Causes of Impairment
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)
Algal Growth 127   202
Ammonia 49    
Cause Unknown 1,020    
Cause Unknown - Impaired Biota 7,137   388
Chlorine 9    
Dioxins 473 158  
Flow Alteration(s) 1,865    
Habitat Alterations 844    
Mercury 2,974 50,694 8
Metals (other than Mercury) 9,650 628  
Noxious Aquatic Plants 5   1,916
Nutrients 4,886 2,694 37
Oil and Grease 41 103 1
Organic Enrichment/Oxygen Depletion 2,979 58,485 1,884
Pathogens 13,661 6,283 194
Pesticides 291 27  
pH/Acidity/Caustic Conditions 5,467 5,132 6
Polychlorinated Biphenyls (PCBs) 3,110 81,698 2,063
Salinity/Total Dissolved Solids/Chlorides/Sulfates 245   141
Sediment 8,188 193 12
Taste, Color and Odor 17    
Temperature 681 99 1
Total Toxics 89   1
Toxic Inorganics 80    
Toxic Organics 81   12
Trash 15    
Turbidity 229    

Top of page


Region 3 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.
Probable Source Group Size of Assessed Waters with Probable Sources of Impairments
Rivers and
Streams (Miles)		 Lakes, Reservoirs,
and Ponds (Acres)		 Bays and
Estuaries
(Square Miles)
Agriculture 9,417 1,532 2,103
Aquaculture 3    
Atmospheric Deposition 1,076 1,561 2,095
Commercial Harbor And Port Activities     11
Construction 399    
Habitat Alterations (Not Directly Related To Hydromodification) 1,196   2,091
Hydromodification 1,427 1,687 1,916
Industrial 677   2,117
Land Application/Waste Sites/Tanks 166    
Legacy/Historical Pollutants 197   36
Municipal Dishcarges/Sewage 2,783 1,393 2,148
Natural/Wildlife 5,341 6,733 2,121
Other 938 103 2,090
Recreation And Tourism (Non-Boating) 51    
Recreational Boating And Marinas     0
Resource Extraction 5,918 26  
Silviculture (Forestry) 36    
Spills/Dumping 21   0
Unknown 7,808 91,663 2,110
Unspecified Nonpoint Source 1,884 88 261
Urban-Related Runoff/Stormwater 4,642 1,891 305

Top of page


Region 3 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.
Cycle Attaining Number of Waters Attaining Number of Causes of
Impairment Addressed
2009 color.gif 13 16

Top of page


Region 3
Impaired Waters Listed By State

Description of this table
State Name Number of Waters on 303(d) List
Delaware color.gif 101
District Of Columbia color.gif 27
Maryland color.gif 501
Pennsylvania color.gif 6,957
Virginia color.gif 2,534
West Virginia color.gif 981

Top of page


Region 3 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.
Pollutant Group Number of TMDLs Number of Causes of
Impairment Addressed
Metals (other than Mercury) color.gif 5,198 5,280
Pathogens color.gif 1,350 1,419
Nutrients color.gif 1,072 1,127
Sediment color.gif 1,059 1,088
pH/Acidity/Caustic Conditions color.gif 1,037 1,063
Organic Enrichment/Oxygen Depletion color.gif 312 312
Ammonia color.gif 242 242
Pesticides color.gif 181 181
Polychlorinated Biphenyls (PCBs) color.gif 167 167
Turbidity color.gif 152 152
Cause Unknown - Impaired Biota color.gif 136 140
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 114 115
Toxic Organics color.gif 89 89
Toxic Inorganics color.gif 62 62
Other Cause color.gif 40 40
Temperature color.gif 13 13
Mercury color.gif 11 11
Chlorine color.gif 8 8
Oil and Grease color.gif 7 7
Total Toxics color.gif 7 7
Dioxins color.gif 6 6
Cause Unknown color.gif 5 5
Fish Consumption Advisory color.gif 2 2
Habitat Alterations color.gif 2 2
Algal Growth color.gif 1 1

Total: 11,273 TMDLs; 11,539 Causes of Impairment Addressed

Top of page


Region 3 Approved TMDLs By State

This chart includes TMDLs since October 1, 1995.

Description of this table
State Name Number of TMDLs
Delaware color.gif 558
District Of Columbia color.gif 360
Maryland color.gif 608
Pennsylvania color.gif 6,207
Virginia color.gif 979
West Virginia color.gif 2,561

Top of page


Region 3 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.
Fiscal Year Number of TMDLs Number of Causes of
Impairment Addressed
1998 color.gif 131 131
1999 color.gif 47 47
2000 color.gif 22 22
2001 color.gif 1,427 1,427
2002 color.gif 874 874
2003 color.gif 1,084 1,092
2004 color.gif 1,168 1,198
2005 color.gif 1,733 1,806
2006 color.gif 1,195 1,256
2007 color.gif 1,135 1,179
2008 color.gif 956 985
2009 color.gif 1,493 1,514
2010 color.gif 8 8

Total: 11,273 TMDLs; 11,539 Causes of Impairment Addressed

Top of page

Status of Available Data Used in This Report

Description of this table
State Name Assessed Waters Report Year Impaired Waters Report Year
Delaware 2006 2006
District Of Columbia 2008 2008
Maryland 2002 2006
Pennsylvania 2006 2004
Virginia 2008 2008
West Virginia 2008 2008


TMDL Document Search


Full Text Search of TMDL Documents

Top of page

Jump to main content.