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- Virgin Islands Assessment Summary
- Water Quality by Waterbody Type
- Causes of Impairment
- Probable Sources Contributing to Impairments
- TMDL Alternatives by Cause of Impairment
- Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these cycles:
2002
2004
2006
2010
Waterbody Changes from Prior Cycle
For More Information:
Virgin Islands Assessment Report
State Water Quality Program
Virgin Islands Water Quality Assessment Report
Search for a waterbody within Virgin Islands
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
Virgin Islands (2008)
Description of this table
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2008
Site-specific Targeted Monitoring Results
Virgin Islands Ocean and Near Coastal 2008
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Virgin Islands Ocean and Near Coastal 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 |
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 % Impaired |
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| Aquatic Life Use | 402.3 | 93.1 | .0 | 6.9 | |
| Primary Contact Recreation | 401.5 | 95.6 | .0 | 4.3 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Virgin Islands Ocean and Near Coastal 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 20.2 |
| Turbidity | Turbidity | 12.3 |
| Fecal Coliform | Pathogens | 11.3 |
| Phosphorus, Total | Nutrients | 7.8 |
| Enterococcus Bacteria | Pathogens | 7.1 |
| pH | pH/Acidity/Caustic Conditions | 6.8 |
| Secchi Disk Transparency | Turbidity | 3.2 |
| Ambient Bioassays -- Acute Aquatic Toxicity | Total Toxics | 2.8 |
| Ambient Bioassays - Chronic Aquatic Toxicity | Total Toxics | 2.8 |
| Temperature, Water | Temperature | 1.0 |
Site-specific Targeted Monitoring Results
Probable Sources
Virgin Islands Ocean and Near Coastal 2008
Description of this table
| Probable Source | Probable Source Group | Square Miles Threatened or Impaired |
|---|---|---|
| Source Unknown | Unknown | 12.0 |
| Marina Boat Maintenance | Recreational Boating And Marinas | 4.9 |
| Non-Point Source | Unspecified Nonpoint Source | 4.2 |
| Other Marina/Boating On-Vessel Discharges | Recreational Boating And Marinas | 3.8 |
| On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) | Municipal Discharges/Sewage | 3.7 |
| Marina/Boating Sanitary On-Vessel Discharges | Recreational Boating And Marinas | 3.6 |
| Highways, Roads, Bridges, Infrastructure (New Construction) | Construction | 3.4 |
| Other Recreational Pollution Sources | Recreation And Tourism (Non-Boating) | 3.3 |
| Industrial Point Source Discharge | Industrial | 3.1 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 3.0 |
| Highway/Road/Bridge Runoff (Non-Construction Related) | Urban-Related Runoff/Stormwater | 2.4 |
| Changes In Tidal Circulation/Flushing | Hydromodification | 2.0 |
| Marina/Boating Pumpout Releases | Recreational Boating And Marinas | 1.7 |
| Illegal Dumping | Spills/Dumping | 1.3 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 1.3 |
| Post-Development Erosion And Sedimentation | Hydromodification | 1.3 |
| Other Spill Related Impacts | Spills/Dumping | 1.2 |
| Agriculture | Agriculture | 1.1 |
| Impacts From Resort Areas (Winter And Non-Winter Resorts) | Recreation And Tourism (Non-Boating) | 1.0 |
| Marina Boat Construction | Recreational Boating And Marinas | 1.0 |
| Accidental Release/Spill | Spills/Dumping | 1.0 |
| Ballast Water Releases | Commercial Harbor And Port Activities | .9 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | .6 |
| Residential Districts | Urban-Related Runoff/Stormwater | .5 |
| Wastes From Pets | Urban-Related Runoff/Stormwater | .2 |
| Dredging (E.G., For Navigation Channels) | Hydromodification | .2 |
| Commercial Ferries | Commercial Harbor And Port Activities | .1 |
| Marina Fueling Operations | Recreational Boating And Marinas | .1 |
| Municipal Point Source Impacts From Inadequate Industrial/Commercial Pretreatment | Municipal Discharges/Sewage | .1 |
| Erosion From Derelict Land (Barren Land) | Hydromodification | .0 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | .0 |
Virgin Islands 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. 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) |
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| Nutrients | 7.8 | ||||||||||||||
| Organic Enrichment/Oxygen Depletion | 20.2 | ||||||||||||||
| Pathogens | 15.1 | ||||||||||||||
| pH/Acidity/Caustic Conditions | 6.8 | ||||||||||||||
| Temperature | 1.0 | ||||||||||||||
| Total Toxics | 2.8 | ||||||||||||||
| Turbidity | 12.6 | ||||||||||||||
Virgin Islands Probable Sources Contributing to Impairments
for Reporting Year 2008
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) |
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| Agriculture | 1.1 | ||||||||||||||
| Commercial Harbor And Port Activities | 1.0 | ||||||||||||||
| Construction | 3.4 | ||||||||||||||
| Hydromodification | 3.4 | ||||||||||||||
| Industrial | 3.1 | ||||||||||||||
| Municipal Discharges/Sewage | 6.7 | ||||||||||||||
| Recreation And Tourism (Non-Boating) | 4.3 | ||||||||||||||
| Recreational Boating And Marinas | 8.2 | ||||||||||||||
| Spills/Dumping | 2.5 | ||||||||||||||
| Unknown | 12.0 | ||||||||||||||
| Unspecified Nonpoint Source | 4.2 | ||||||||||||||
| Urban-Related Runoff/Stormwater | 4.2 | ||||||||||||||
Virgin Islands TMDL Alternatives by Cause of Impairment 2008
No TMDL Alternatives reported.
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.
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 |
|---|---|
| Organic Enrichment/Oxygen Depletion | 56 |
| Turbidity | 37 |
| Pathogens | 26 |
| pH/Acidity/Caustic Conditions | 23 |
| Nutrients | 8 |
| Temperature | 3 |
| Total Toxics | 2 |
Total: 155 Causes of Impairment
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) |  19 |
19 |
| Fecal Coliform | 18 |
18 |
| Sediment Oxygen Demand | 14 |
14 |
| Dissolved Oxygen | 5 |
5 |
| Enterococcus Bacteria | 5 |
5 |
| Oil and Grease | 3 |
3 |
| Phosphorus | 1 |
1 |
| Total Suspended Solids (TSS) | 1 |
1 |
Total: 66 TMDLs; 66 Causes of Impairment Addressed
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 | 3 |
3 |
| 2004 | 3 |
3 |
| 2005 | 10 |
10 |
| 2006 | 1 |
1 |
| 2007 | 12 |
12 |
| 2010 | 37 |
37 |
Total: 66 TMDLs; 66 Causes of Impairment Addressed