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Data are also available for these years:  2002  2004  2006

303(d) Listed Waters for 2008

Waterbody Changes from Prior Cycle

Comparison Summary by Reporting Year

For More Information:

Guam Assessment Report Exit EPA Disclaimer
State Water Quality Program Exit EPA Disclaimer

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Guam 2008 Water Quality Assessment Report

Assessed Waters of Guam by Watershed

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Display impaired waters and TMDL information only

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Guam Assessment Summary for Reporting Year 2008

Description of this table
  Size of Water
Rivers and
Streams (Miles)		 Bays and
Estuaries
(Square Miles)		 Coastal
Shoreline
(Miles)		 Wetlands
(Acres)
   Good Waters
      Previously impaired waters
      now attaining all uses
   Threatened Waters
      TMDL completed                
      TMDL alternative                
      Non-pollutant impairment                
      TMDL needed                
   Impaired Waters 32.3 14.8 15.5 6.4
      TMDL completed     17.0            
      TMDL alternative                
      Non-pollutant impairment                
      TMDL needed     15.3     14.8     15.5     6.4
         New TMDLs completed     .0     .0     .0     .0
         Remaining TMDLs needed           15.3           14.8           15.5           6.4
Total Assessed Waters 32.3 14.8 15.5 6.4
Total Waters 228.7 915.0 116.5 Unavailable
Percent of Waters Assessed 14.1 1.6 13.3 Unavailable

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2008


Guam Assessed Waters
Summary of Water Quality Attainment for Rivers and Streams
Reporting Year 2008

Description of this table
Assessed Status Miles
Assessed 32.3
Unassessed 196.4
Total Miles 228.7







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Attainment Status Miles
Good .0
Threatened .0
Impaired 32.3
Total Miles Assessed 32.3







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TMDL Development Status Miles
All TMDLs completed 17.0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 15.3
Total Threatened and Impaired 32.3

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Guam Assessed Waters
Designated Use Support for Rivers and Streams
Reporting Year 2008*

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aesthetic Enjoyment 4.9 .0 .0 100.0 color.gif
Aquatic Life 32.2 .0 .0 100.0 color.gif
Consumption 4.9 .0 .0 100.0 color.gif
Drinking Water .1 .0 .0 100.0 color.gif
Drinking Water (With Treatment) 4.9 .0 .0 100.0 color.gif
Limited Body Contact Recreation 4.7 .0 .0 100.0 color.gif
Whole Body Contact Recreation 5.5 .0 .0 100.0 color.gif

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Guam Causes of Impairment
for Threatened and Impaired Rivers and Streams
Reporting Year 2008

Description of this table
Cause of Impairment Cause of Impairment Group Miles
Threatened or
Impaired
Sedimentation/Siltation Sediment color.gif 22.0
Escherichia Coli (E. Coli) Pathogens color.gif 9.7
Enterococcus Bacteria Pathogens color.gif 5.4
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 5.3
Nitrates Nutrients color.gif 4.9
Chromium, Total Metals (other than Mercury) color.gif 4.9
Salinity Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 4.9
Total Dissolved Solids (TDS) Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 4.9
Temperature, Water Temperature color.gif 4.9
Iron Metals (other than Mercury) color.gif 4.9
Nickel Metals (other than Mercury) color.gif 4.9
Manganese Metals (other than Mercury) color.gif 4.9
Ammonia, Un-ionized Ammonia color.gif 4.9
Total Suspended Solids (TSS) Turbidity color.gif 4.9
Copper Metals (other than Mercury) color.gif 4.9
Zinc Metals (other than Mercury) color.gif 4.9
Total Coliform Pathogens color.gif 4.9
Aluminum Metals (other than Mercury) color.gif 4.9

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Guam Probable Sources of Impairments
for Threatened and Impaired Rivers and Streams
Reporting Year 2008

No probable sources of impairments reported.

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Guam Assessed Waters
Summary of Water Quality Attainment for Bays and Estuaries
Reporting Year 2008

Description of this table
Assessed Status Square Miles
Assessed 14.8
Unassessed 900.2
Total Square Miles 915.0







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Attainment Status Square Miles
Good .0
Threatened .0
Impaired 14.8
Total Square Miles Assessed 14.8







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TMDL Development Status Square Miles
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 14.8
Total Threatened and Impaired 14.8

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Guam Assessed Waters
Designated Use Support for Bays and Estuaries
Reporting Year 2008*

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Square Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aquatic Life 1.7 .0 .0 100.0 color.gif
Consumption 14.0 .0 .0 100.0 color.gif
Whole Body Contact Recreation .7 .0 .0 100.0 color.gif

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Guam Causes of Impairment
for Threatened and Impaired Bays and Estuaries
Reporting Year 2008

Description of this table
Cause of Impairment Cause of Impairment Group Square Miles
Threatened or
Impaired
PCB(s) in Fish Tissue Polychlorinated Biphenyls (PCBs) color.gif 13.1
Arsenic Metals (other than Mercury) color.gif 1.0
Dieldrin Pesticides color.gif 1.0
Antimony Toxic Inorganics color.gif 1.0
Tetrachloroethylene Toxic Organics color.gif 1.0
Chlordane Pesticides color.gif 1.0
Trichloroethylene (TCE) Toxic Organics color.gif 1.0
Nitrates Nutrients color.gif .7
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif .7
Enterococcus Bacteria Pathogens color.gif .7

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Guam Probable Sources of Impairments
for Threatened and Impaired Bays and Estuaries
Reporting Year 2008

No probable sources of impairments reported.

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Guam Assessed Waters
Summary of Water Quality Attainment for Coastal Shoreline
Reporting Year 2008

Description of this table
Assessed Status Miles
Assessed 15.5
Unassessed 101.0
Total Miles 116.5







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Attainment Status Miles
Good .0
Threatened .0
Impaired 15.5
Total Miles Assessed 15.5







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TMDL Development Status Miles
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 15.5
Total Threatened and Impaired 15.5

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Guam Assessed Waters
Designated Use Support for Coastal Shoreline
Reporting Year 2008*

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Miles Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Limited Body Contact Recreation .9 .0 .0 100.0 color.gif
Whole Body Contact Recreation 14.6 .0 .0 100.0 color.gif

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Guam Causes of Impairment
for Threatened and Impaired Coastal Shoreline
Reporting Year 2008

Description of this table
Cause of Impairment Cause of Impairment Group Miles
Threatened or
Impaired
Enterococcus Bacteria Pathogens color.gif 15.5

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Guam Probable Sources of Impairments
for Threatened and Impaired Coastal Shoreline
Reporting Year 2008

No probable sources of impairments reported.

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Guam Assessed Waters
Summary of Water Quality Attainment for Wetlands
Reporting Year 2008

Description of this table
Pie chart not displayed because total size for Wetlands is unavailable.
Assessed Status Acres
Assessed 6.4
Unassessed Unavailable
Total Acres Unavailable







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Attainment Status Acres
Good .0
Threatened .0
Impaired 6.4
Total Acres Assessed 6.4







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TMDL Development Status Acres
All TMDLs completed .0
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 6.4
Total Threatened and Impaired 6.4

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Guam Assessed Waters
Designated Use Support for Wetlands
Reporting Year 2008*

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
Designated Use Acres Assessed Percent Good Percent Threatened Percent Impaired % Good
% Threatened
% Impaired
Aquatic Life 6.4 .0 .0 100.0 color.gif
Consumption 6.4 .0 .0 100.0 color.gif

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Guam Causes of Impairment
for Threatened and Impaired Wetlands
Reporting Year 2008

Description of this table
Cause of Impairment Cause of Impairment Group Acres
Threatened or
Impaired
PCB(s) in Fish Tissue Polychlorinated Biphenyls (PCBs) color.gif 6.4

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Guam Probable Sources of Impairments
for Threatened and Impaired Wetlands
Reporting Year 2008

No probable sources of impairments reported.

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Guam Causes of Impairment for Reporting Year 2008


Description of this table
NOTE: Click on the underlined Cause of Impairment Group to see a list of specific state causes of impairment making up the Cause of Impairment Group.
Cause of Impairment Group Size of Assessed Waters with Listed Causes of Impairment
Rivers and
Streams (Miles)		 Bays and
Estuaries
(Square Miles)		 Coastal
Shoreline
(Miles)		 Wetlands
(Acres)
Ammonia 4.9
Metals (other than Mercury) 4.9 1.0
Nutrients 4.9 .7
Organic Enrichment/Oxygen Depletion 5.3 .7
Pathogens 10.3 .7 15.5
Pesticides 1.0
Polychlorinated Biphenyls (PCBs) 13.1 6.4
Salinity/Total Dissolved Solids/Chlorides/Sulfates 4.9
Sediment 22.0
Temperature 4.9
Toxic Inorganics 1.0
Toxic Organics 1.0
Turbidity 4.9

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Guam Probable Sources Contributing to Impairments
for Reporting Year 2008

No probable sources reported.

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Guam TMDL Alternatives by Cause of Impairment 2008


No TMDL Alternatives reported.

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Guam Previously Impaired Waters Now Attaining All Uses


No previously impaired waters reported as attaining all uses.

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Guam 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.
Cause of Impairment Group Name Number of Causes of Impairment Reported
Pathogens color.gif 52
Metals (other than Mercury) color.gif 15
Polychlorinated Biphenyls (PCBs) color.gif 4
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 4
Organic Enrichment/Oxygen Depletion color.gif 4
Nutrients color.gif 4
Toxic Organics color.gif 2
Pesticides color.gif 2
Ammonia color.gif 2
Turbidity color.gif 2
Temperature color.gif 2
Sediment color.gif 1
Toxic Inorganics color.gif 1

Total: 95 Causes of Impairment

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Guam Cumulative TMDLs by Pollutant

This chart includes TMDLs since October 1, 1995.

Description of this table
NOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant.
Pollutant Number of TMDLs Number of Causes of
Impairment Addressed
Sediment color.gif 1 1

Total: 1 TMDLs; 1 Causes of Impairment Addressed


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Guam 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
2007 color.gif 1 1

Total: 1 TMDLs; 1 Causes of Impairment Addressed

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