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- American Samoa 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
2008
Waterbody Changes from Prior Cycle
For More Information:
American Samoa Water Quality Assessment Report
Search for a waterbody within American Samoa
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
American Samoa (2010)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
||||||||||||||
| Good Waters | 20.5 | 53.5 | |||||||||||||
| Previously impaired waters now attaining all uses |
7.5 | ||||||||||||||
| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 210.1 | 80.7 | |||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 210.1 | 80.7 | |||||||||||||
| New TMDLs completed | .0 | .0 | |||||||||||||
| Remaining TMDLs needed | 210.1 | 80.7 | |||||||||||||
 |
|||||||||||||||
| Total Assessed Waters | 230.6 | 134.2 | |||||||||||||
| Total Waters | 257.5 | 159.2 | |||||||||||||
| Percent of Waters Assessed | 89.6 | 84.3 | |||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010
Site-specific Targeted Monitoring Results
American Samoa Rivers and Streams 2010
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
American Samoa Rivers and Streams 2010
* 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 |
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| Aquatic Life | 230.6 | 27.9 | .0 | 72.1 | |
| Swimming | 205.8 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
American Samoa Rivers and Streams 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Enterococcus Bacteria | Pathogens | 205.8 |
| Nitrogen, Total | Nutrients | 166.2 |
| Phosphorus, Total | Nutrients | 151.8 |
| Turbidity | Turbidity | 150.2 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 130.4 |
Site-specific Targeted Monitoring Results
Probable Sources
American Samoa Rivers and Streams 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Animal Feeding Operations (Nps) | Agriculture | 210.1 |
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 210.1 |
Site-specific Targeted Monitoring Results
American Samoa Coastal Shoreline 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
American Samoa Coastal Shoreline 2010
* 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 |
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| Aquatic Life | 77.8 | 54.4 | .0 | 45.6 | |
| Fish Consumption | 28.6 | 72.4 | .0 | 27.6 | |
| Swimming | 112.3 | 39.8 | .0 | 60.2 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
American Samoa Coastal Shoreline 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Enterococcus Bacteria | Pathogens | 67.6 |
| Undetermined NPS Stressor | Cause Unknown - Impaired Biota | 35.5 |
| Arsenic | Metals (other than Mercury) | 7.9 |
| Mercury | Mercury | 7.9 |
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 7.9 |
Site-specific Targeted Monitoring Results
Probable Sources
American Samoa Coastal Shoreline 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Sanitary Sewer Overflows (Collection System Failures) | Municipal Discharges/Sewage | 67.6 |
| Animal Feeding Operations (Nps) | Agriculture | 67.6 |
| Multiple Non-Point Sources | Unspecified Nonpoint Source | 35.5 |
| Contaminated Sediments | Legacy/Historical Pollutants | 7.9 |
American Samoa 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 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
||||||||||||||
| Cause Unknown - Impaired Biota | 35.5 | ||||||||||||||
| Mercury | 7.9 | ||||||||||||||
| Metals (other than Mercury) | 7.9 | ||||||||||||||
| Nutrients | 166.2 | ||||||||||||||
| Organic Enrichment/Oxygen Depletion | 130.4 | ||||||||||||||
| Pathogens | 205.8 | 67.6 | |||||||||||||
| Polychlorinated Biphenyls (PCBs) | 7.9 | ||||||||||||||
| Turbidity | 150.2 | ||||||||||||||
American Samoa 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 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
||||||||||||||
| Agriculture | 210.1 | 67.6 | |||||||||||||
| Legacy/Historical Pollutants | 7.9 | ||||||||||||||
| Municipal Discharges/Sewage | 210.1 | 67.6 | |||||||||||||
| Unspecified Nonpoint Source | 35.5 | ||||||||||||||
American Samoa TMDL Alternatives by Cause of Impairment 2010
No TMDL Alternatives reported.
American Samoa Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
Description of this table| 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 |
|---|---|---|
| 2009 | 1 |
1 |
| 2010 | 4 |
4 |
American Samoa 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 | 40 |
| Nutrients | 29 |
| Turbidity | 14 |
| Cause Unknown - Impaired Biota | 11 |
| Organic Enrichment/Oxygen Depletion | 10 |
| Metals (other than Mercury) | 1 |
| Mercury | 1 |
| Polychlorinated Biphenyls (PCBs) | 1 |
Total: 107 Causes of Impairment
American Samoa 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 |
|---|---|---|
| Mercury in Fish Tissue |  1 |
1 |
| PCB(s) in Fish Tissue | 1 |
1 |
Total: 2 TMDLs; 2 Causes of Impairment Addressed
American Samoa 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 | 2 |
2 |
Total: 2 TMDLs; 2 Causes of Impairment Addressed