Site-specific Targeted Monitoring Summary Results

Virgin Islands (2016)

	Size of Water
	Ocean and Near Coastal (Square Miles)
Good Waters	372.1
Previously impaired waters       now attaining all uses	2.6
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters	48.6
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed	48.6
New TMDLs completed	5.0
Remaining TMDLs needed	43.6
Total Assessed Waters	420.6
Total Waters	Unavailable
Percent of Waters Assessed	Unavailable

Top of page

Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2016

Site-specific Targeted Monitoring Results

Virgin Islands Ocean and Near Coastal 2016

Description of this table Pie chart not displayed because total size for Ocean and Near Coastal is unavailable. Assessed Status Square Miles Assessed 420.6 Unassessed Unavailable Total Square Miles Unavailable

Description of this table Assessed Ocean and Near Coastal 420.6 Square Miles of Assessed Ocean and Near Coastal Attainment Status Square Miles Good 372.1 Threatened .0 Impaired 48.6 Total Square Miles Assessed 420.6

Description of this table Threatened and Impaired Ocean and Near Coastal 48.6 Square Miles of Threatened and Impaired Ocean and Near Coastal TMDL Development Status Square Miles All TMDLs completed 5.0 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed 43.6 Total Threatened and Impaired 48.6

Top of page

Site-specific Targeted Monitoring Results

Individual Designated Use Support
Virgin Islands Ocean and Near Coastal 2016

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

Designated Use	Square Miles Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Aquatic Life Use	402.3	87.9	.0	12.1
Primary Contact Recreation	420.6	88.5	.0	11.5

Top of page

Site-specific Targeted Monitoring Results

Causes of Impairment
Virgin Islands Ocean and Near Coastal 2016

Cause of Impairment	Cause of Impairment Group	Square Miles Threatened or Impaired
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	40.2
Turbidity	Turbidity	36.2
Fecal Coliform	Pathogens	20.3
pH	pH/Acidity/Caustic Conditions	18.4
Enterococcus Bacteria	Pathogens	16.6
Phosphorus	Nutrients	8.4
Secchi Disk Transparency	Turbidity	3.1
Toxicity	Total Toxics	2.8
Temperature	Temperature	1.0
Total Suspended Solids (TSS)	Turbidity	.7
Oil and Grease	Oil and Grease	.5

Top of page

Site-specific Targeted Monitoring Results

Probable Sources
Virgin Islands Ocean and Near Coastal 2016

Probable Source	Probable Source Group	Square Miles Threatened or Impaired
Unknown	Unknown	13.7
Other Recreational Pollution Sources	Recreation And Tourism (Non-Boating)	13.7
Marina Boat Maintenance	Recreational Boating And Marinas	5.6
Highway/Road/Bridge Runoff (Non-Construction Related)	Urban-Related Runoff/Stormwater	5.5
Erosion And Sedimentation	Hydromodification	4.7
Non-Point Source	Unspecified Nonpoint Source	4.5
Marina/Boating Sanitary On-Vessel Discharges	Recreational Boating And Marinas	4.4
Other Marina/Boating On-Vessel Discharges	Recreational Boating And Marinas	3.4
Industrial Point Source Discharge	Industrial	3.1
On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems)	Municipal Discharges/Sewage	2.9
Highways, Roads, Bridges, Infrasturcture (New Construction)	Construction	2.5
Changes In Tidal Circulation/Flushing	Hydromodification	2.0
Marina/Boating Pumpout Releases	Recreational Boating And Marinas	1.7
Discharges From Municipal Combined Storm Sewer Systems	Urban-Related Runoff/Stormwater	1.6
Municipal Point Source Discharges	Municipal Discharges/Sewage	1.4
Illegal Dumping	Spills/Dumping	1.3
Residential Districts	Urban-Related Runoff/Stormwater	1.2
Land Development	Construction	1.1
Impacts From Resort Areas (Winter And Non-Winter Resorts)	Recreation And Tourism (Non-Boating)	1.0
Other Spill Related Impacts	Spills/Dumping	1.0
Major Municipal Point Source	Municipal Discharges/Sewage	.9
Highways, Roads, Bridges, Infrastructure (New Construction)	Construction	.9
Major Industrial Point Source	Industrial	.7
Urban Runoff/Storm Sewers	Urban-Related Runoff/Stormwater	.6
Internal Nutrient Recycling	Natural/Wildlife	.6
Post-Development Erosion And Sedimentation	Hydromodification	.4
Impacts From Resort Areas	Recreation And Tourism (Non-Boating)	.3
Urban Runoff	Urban-Related Runoff/Stormwater	.3
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems)	Municipal Discharges/Sewage	.2
Dredging (E.G., For Navigation Channels)	Hydromodification	.2
Commercial Ferries	Commercial Harbor And Port Activities	.1
Package Plants (Small Flows)	Municipal Discharges/Sewage	.1
Marina Fueling Operations	Recreational Boating And Marinas	.1
Municipal Point Source Impacts From Inadequate Industrial/Commercial Pretreatment	Municipal Discharges/Sewage	.1
Sanitary Sewer Overflows (Collection System Failures)	Municipal Discharges/Sewage	.0
Erosion From Derelict Land (Barren Land)	Hydromodification	.0

Top of page

Virgin Islands Causes of Impairment for Reporting Year 2016

Top of page

Virgin Islands Probable Sources Contributing to Impairments
for Reporting Year 2016

Top of page

Virgin Islands TMDL Alternatives by Cause of Impairment 2016

No TMDL Alternatives reported.

Top of page

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

NOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those previously 303(d)-listed waters now attaining all applicable water quality standards.
Year Attaining	Number of Waters Attaining	Number of Causes of Impairment Addressed
2017	2	2

Top of page

Virgin Islands Causes of Impairment for 303(d) Listed Waters

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	77
Turbidity	75
Pathogens	64
pH/Acidity/Caustic Conditions	20
Nutrients	14
Oil and Grease	3
Temperature	3
Total Toxics	1

Total: 257 Causes of Impairment

Top of page

Virgin Islands Cumulative TMDLs by Pollutant

This chart includes TMDLs since October 1, 1995.

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

Top of page

Virgin Islands Cumulative Number of TMDLs

EPA Fiscal Year starts October 1 and ends September 30.

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

Top of page

TMDL Document Search

Top of page