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On This Page 303(d) Listed Waters for 2010

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2002 2004 2006 2008

Waterbody Changes from Prior Cycle

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Virgin Islands Water Quality Assessment Report


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Site-specific Targeted Monitoring Summary Results

Virgin Islands (2010)

Description of this table
  Size of Water
Ocean and
Near Coastal
(Square Miles)
   Good Waters 294.5
      Previously impaired waters
      now attaining all uses
   Threatened Waters
      TMDL completed     
      TMDL alternative     
      Non-pollutant impairment     
      TMDL needed     
   Impaired Waters 30.4
      TMDL completed     .4
      TMDL alternative     
      Non-pollutant impairment     
      TMDL needed     30.0
         New TMDLs completed     2.2
         Remaining TMDLs needed           27.8
Total Assessed Waters 325.0
Total Waters Unavailable
Percent of Waters Assessed Unavailable

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010


Site-specific Targeted Monitoring Results

Virgin Islands Ocean and Near Coastal 2010

Description of this table
Pie chart not displayed because total size for Ocean and Near Coastal is unavailable.
Assessed Status Square Miles
Assessed 325.0
Unassessed Unavailable
Total Square Miles Unavailable







arrow pointing right 		Description of this table
Attainment Status Square Miles
Good 294.5
Threatened .0
Impaired 30.4
Total Square Miles Assessed 325.0







arrow pointing right 		Description of this table
TMDL Development Status Square Miles
All TMDLs completed 2.6
TMDL alternative .0
Non-pollutant impairment .0
TMDL needed 27.8
Total Threatened and Impaired 30.4

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Virgin Islands Ocean and Near Coastal 2010

* 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 Use 325.0 90.6 .0 9.4 color.gifcolor.gif
Primary Contact Recreation 325.0 90.6 .0 9.4 color.gifcolor.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Virgin Islands Ocean and Near Coastal 2010

Description of this table
Cause of Impairment Cause of Impairment Group Square Miles
Threatened or
Impaired
Turbidity Turbidity color.gif 22.4
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 18.9
Fecal Coliform Pathogens color.gif 12.5
Enterococcus Bacteria Pathogens color.gif 11.3
Phosphorus, Total Nutrients color.gif 6.8
pH pH/Acidity/Caustic Conditions color.gif 6.7
Secchi Disk Transparency Turbidity color.gif 3.2
Toxicity Total Toxics color.gif 2.8
Temperature, Water Temperature color.gif 1.0

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Site-specific Targeted Monitoring Results

Probable Sources
Virgin Islands Ocean and Near Coastal 2010

Description of this table
Probable Source Probable Source Group Square Miles
Threatened or
Impaired
Multiple Non-Point Sources Unspecified Nonpoint Source color.gif 4.8
Marina Boat Maintenance Recreational Boating And Marinas color.gif 4.6
Industrial Point Source Discharge Industrial color.gif 3.8
Other Recreational Pollution Sources Recreation And Tourism (Non-Boating) color.gif 3.4
Source Unknown Unknown color.gif 3.3
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 3.0
Highway/Road/Bridge Runoff (Non-Construction Related) Urban-Related Runoff/Stormwater color.gif 2.9
Other Marina/Boating On-Vessel Discharges Recreational Boating And Marinas color.gif 2.8
Highways, Roads, Bridges, Infrastructure (New Construction) Construction color.gif 2.6
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 2.6
Changes In Tidal Circulation/Flushing Hydromodification color.gif 2.0
Non-Point Source Unspecified Nonpoint Source color.gif 1.9
Marina/Boating Pumpout Releases Recreational Boating And Marinas color.gif 1.7
Marina/Boating Sanitary On-Vessel Discharges Recreational Boating And Marinas color.gif 1.4
Municipal Point Source Impacts From Inadequate Industrial/Commercial Pretreatment Municipal Discharges/Sewage color.gif 1.4
Combined Sewer Overflows Municipal Discharges/Sewage color.gif 1.3
Illegal Dumping Spills/Dumping color.gif 1.3
Residential Districts Urban-Related Runoff/Stormwater color.gif 1.2
Erosion And Sedimentation Hydromodification color.gif 1.1
Municipal Point Source Discharges Municipal Discharges/Sewage color.gif .9
Internal Nutrient Recycling Natural/Wildlife color.gif .6
Impacts From Resort Areas (Winter And Non-Winter Resorts) Recreation And Tourism (Non-Boating) color.gif .4
Post-Development Erosion And Sedimentation Hydromodification color.gif .4
Discharges From Municipal Separate Storm Sewer Systems (Ms4) Urban-Related Runoff/Stormwater color.gif .3
Other Spill Related Impacts Spills/Dumping color.gif .3
Dredging (E.G., For Navigation Channels) Hydromodification color.gif .2
Wastes From Pets Urban-Related Runoff/Stormwater color.gif .2
Package Plant Or Other Permitted Small Flows Discharges Municipal Discharges/Sewage color.gif .2
Commercial Ferries Commercial Harbor And Port Activities color.gif .1
Marina Fueling Operations Recreational Boating And Marinas color.gif .1
Erosion From Derelict Land (Barren Land) Hydromodification color.gif .0

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Virgin Islands Causes of Impairment for Reporting Year 2010


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. See also Pollution categories summary document (PDF) (20 pp, 557K, About PDF) for brief, non-technical descriptions of general cause categories.
Cause of Impairment Group Size of Assessed Waters with Listed Causes of Impairment
Ocean and
Near Coastal
(Square Miles)
Nutrients 6.8
Organic Enrichment/Oxygen Depletion 18.9
Pathogens 16.3
pH/Acidity/Caustic Conditions 6.7
Temperature 1.0
Total Toxics 2.8
Turbidity 22.4

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Virgin Islands Probable Sources Contributing to Impairments
for Reporting Year 2010

Description of this table
NOTE: Click on the underlined Probable Source Group to see a list of specific state Probable Sources making up the Probable Source Group.
Probable Source Group Size of Assessed Waters with Probable Sources of Impairments
Ocean and
Near Coastal
(Square Miles)
Commercial Harbor And Port Activities .1
Construction 2.6
Hydromodification 3.7
Industrial 3.8
Municipal Discharges/Sewage 6.8
Natural/Wildlife .6
Recreation And Tourism (Non-Boating) 3.8
Recreational Boating And Marinas 8.8
Spills/Dumping 1.6
Unknown 3.3
Unspecified Nonpoint Source 6.7
Urban-Related Runoff/Stormwater 6.2

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Virgin Islands TMDL Alternatives by Cause of Impairment 2010


No TMDL Alternatives reported.

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Virgin Islands Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards


No previously 303(d)-listed waters reported as now attaining all applicable water quality standards.

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Virgin Islands 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
Turbidity color.gif 75
Organic Enrichment/Oxygen Depletion color.gif 54
Pathogens color.gif 40
pH/Acidity/Caustic Conditions color.gif 23
Nutrients color.gif 8
Temperature color.gif 3
Total Toxics color.gif 1

Total: 204 Causes of Impairment

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Virgin Islands 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
Biochemical Oxygen Demand (BOD) color.gif 19 19
Fecal Coliform color.gif 18 18
Sediment Oxygen Demand color.gif 14 14
Dissolved Oxygen color.gif 5 5
Enterococcus Bacteria color.gif 5 5
Oil and Grease color.gif 3 3
Phosphorus color.gif 1 1
Total Suspended Solids (TSS) color.gif 1 1

Total: 66 TMDLs; 66 Causes of Impairment Addressed


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Virgin Islands 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
2003 color.gif 3 3
2004 color.gif 3 3
2005 color.gif 10 10
2006 color.gif 1 1
2007 color.gif 12 12
2010 color.gif 37 37

Total: 66 TMDLs; 66 Causes of Impairment Addressed

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