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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
2008
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 (2006)
Description of this table
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2006
Site-specific Targeted Monitoring Results
Virgin Islands Ocean and Near Coastal 2006
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Virgin Islands Ocean and Near Coastal 2006
* 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 | 401.0 | 93.5 | .0 | 6.5 | |
| Primary Contact Recreation | 401.1 | 97.5 | .0 | 2.5 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Virgin Islands Ocean and Near Coastal 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 18.7 |
| Turbidity | Turbidity | 11.7 |
| Fecal Coliform | Pathogens | 8.0 |
| Phosphorus, Total | Nutrients | 7.8 |
| Enterococcus Bacteria | Pathogens | 6.1 |
| pH | pH/Acidity/Caustic Conditions | 3.2 |
| 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 2006
No probable sources of impairments reported.
Virgin Islands Causes of Impairment for Reporting Year 2006
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 | 18.7 | ||||||||||||||
| Pathogens | 11.0 | ||||||||||||||
| pH/Acidity/Caustic Conditions | 3.2 | ||||||||||||||
| Temperature | 1.0 | ||||||||||||||
| Total Toxics | 2.8 | ||||||||||||||
| Turbidity | 12.0 | ||||||||||||||
Virgin Islands Probable Sources Contributing to Impairments
for Reporting Year 2006
No probable sources reported.
Virgin Islands TMDL Alternatives by Cause of Impairment 2006
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 | 47 |
| Turbidity | 34 |
| Pathogens | 21 |
| pH/Acidity/Caustic Conditions | 12 |
| Nutrients | 9 |
| Temperature | 3 |
| Total Toxics | 2 |
Total: 128 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