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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
2010
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 (2008)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Coastal Shoreline (Miles) |
||||||||||||||
| Good Waters | 49.9 | 46.2 | |||||||||||||
| Previously impaired waters now attaining all uses |
7.5 | ||||||||||||||
| 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 | |||||||||||||
 |
|||||||||||||||
| 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
Site-specific Targeted Monitoring Results
American Samoa Rivers and Streams 2008
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
American Samoa Rivers and Streams 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 |
|||||
 % Impaired |
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| Aquatic Life | 221.3 | 51.9 | .0 | 48.1 | |
| Swimming | 116.0 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
American Samoa Rivers and Streams 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 |
Site-specific Targeted Monitoring Results
Probable Sources
American Samoa Rivers and Streams 2008
No probable sources of impairments reported.
Site-specific Targeted Monitoring Results
American Samoa Coastal Shoreline 2008
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
American Samoa Coastal Shoreline 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 |
|||||
| % 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 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
American Samoa Coastal Shoreline 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 |
Site-specific Targeted Monitoring Results
Probable Sources
American Samoa Coastal Shoreline 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. 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 | 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) |
||||||||||||||
| Unspecified Nonpoint Source | 31.0 | ||||||||||||||
American Samoa TMDL Alternatives by Cause of Impairment 2008
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 | 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