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- American Samoa Assessment Summary
- Water Quality by Waterbody Type
- Causes of Impairment
- Probable Sources Contributing to Impairments
- Previously Impaired Waters Now Attaining All Uses
- TMDL Alternatives by Cause of Impairment
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these years: 2002 2004 2006
Waterbody Changes from Prior Cycle
Comparison Summary by Reporting Year
For More Information:
American Samoa 2008 Water Quality Assessment Report
Assessed Waters of American Samoa by Watershed
Search for a Waterbody within American Samoa
American Samoa Assessment Summary for Reporting Year 2008
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
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| Good Waters | 49.9 | 46.2 | |||||||||||||
| Previously impaired waters now attaining all uses |
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| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 171.4 | 78.2 | |||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 171.4 | 78.2 | |||||||||||||
| New TMDLs completed | .0 | .0 | |||||||||||||
| Remaining TMDLs needed | 171.4 | 78.2 | |||||||||||||
 |
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| Total Assessed Waters | 221.3 | 124.4 | |||||||||||||
| Total Waters | 257.5 | 149.4 | |||||||||||||
| Percent of Waters Assessed | 85.9 | 83.3 | |||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2008
American Samoa Assessed Waters
Summary of Water Quality Attainment for Rivers and Streams
Reporting Year 2008
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American Samoa Assessed Waters
Designated Use Support for Rivers and Streams
Reporting Year 2008*
* 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 |
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 % Impaired |
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| Aquatic Life | 221.3 | 51.9 | .0 | 48.1 | |
| Swimming | 116.0 | .0 | .0 | 100.0 | |
American Samoa Causes of Impairment
for Threatened and Impaired Rivers and Streams
Reporting Year 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Enterococcus Bacteria | Pathogens | 116.0 |
| Nitrogen, Total | Nutrients | 100.4 |
| Phosphorus, Total | Nutrients | 100.4 |
| Turbidity | Turbidity | 84.4 |
| Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 77.9 |
American Samoa Probable Sources of Impairments
for Threatened and Impaired Rivers and Streams
Reporting Year 2008
No probable sources of impairments reported.
American Samoa Assessed Waters
Summary of Water Quality Attainment for Coastal Shoreline
Reporting Year 2008
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American Samoa Assessed Waters
Designated Use Support for Coastal Shoreline
Reporting Year 2008*
* 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 |
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| % Impaired |
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| Aquatic Life | 67.8 | 54.3 | .0 | 45.7 | |
| Fish Consumption | 28.6 | 72.4 | .0 | 27.6 | |
| Swimming | 102.5 | 29.8 | .0 | 70.2 | |
American Samoa Causes of Impairment
for Threatened and Impaired Coastal Shoreline
Reporting Year 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Enterococcus Bacteria | Pathogens | 72.0 |
| Cause Unknown | Cause Unknown | 31.0 |
| Mercury | Mercury | 7.9 |
| Polychlorinated Biphenyls (PCBs) | Polychlorinated Biphenyls (PCBs) | 7.9 |
American Samoa Probable Sources of Impairments
for Threatened and Impaired Coastal Shoreline
Reporting Year 2008
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Non-Point Source | Unspecified Nonpoint Source | 31.0 |
American Samoa 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. | |||||||||||||||
| Cause of Impairment Group | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
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| Cause Unknown | 31.0 | ||||||||||||||
| Mercury | 7.9 | ||||||||||||||
| Nutrients | 100.4 | ||||||||||||||
| Organic Enrichment/Oxygen Depletion | 77.9 | ||||||||||||||
| Pathogens | 116.0 | 72.0 | |||||||||||||
| Polychlorinated Biphenyls (PCBs) | 7.9 | ||||||||||||||
| Turbidity | 84.4 | ||||||||||||||
American Samoa 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 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
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| Unspecified Nonpoint Source | 31.0 | ||||||||||||||
American Samoa TMDL Alternatives by Cause of Impairment 2008
No TMDL Alternatives reported.
American Samoa Previously Impaired Waters Now Attaining All Uses
Description of this table| NOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those waters now attaining all uses. | ||
| Cycle Attaining | Number of Waters Attaining | Number of Causes of Impairment Addressed |
|---|---|---|
| 2009 | 1 |
1 |
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 | 35 |
| Nutrients | 16 |
| Cause Unknown | 10 |
| Turbidity | 7 |
| Organic Enrichment/Oxygen Depletion | 6 |
Total: 74 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