Guam Water Quality Assessment Report

Search for a waterbody within Guam

Features

Site-specific Targeted Monitoring Summary Results

Guam (2010)

	Rivers and Streams (Miles)	Bays and Estuaries (Square Miles)	Coastal Shoreline (Miles)	Wetlands (Acres)
	Size of Water
Good Waters	55.7	20.4
Previously impaired waters now attaining all uses
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters	29.0	14.8	16.1	6.4
TMDL completed	21.6		5.8
TMDL alternative
Non-pollutant impairment
TMDL needed	7.4	14.8	10.3	6.4
New TMDLs completed	.0	.0	.0	.0
Remaining TMDLs needed	7.4	14.8	10.3	6.4

Total Assessed Waters	84.7	35.1	16.1	6.4
Total Waters	228.7	915.0	116.5	1,795.4
Percent of Waters Assessed	37.0	3.8	13.8	.4

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010

Site-specific Targeted Monitoring Results

Guam Rivers and Streams 2010

Description of this table

Assessed Status	Miles

Assessed	84.7
Unassessed	144.0
Total Miles	228.7

Description of this table

Attainment Status	Miles

Good	55.7
Threatened	.0
Impaired	29.0
Total Miles Assessed	84.7

Description of this table

TMDL Development Status	Miles

All TMDLs completed	21.6
TMDL alternative	.0
Non-pollutant impairment	.0
TMDL needed	7.4
Total Threatened and Impaired	29.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Guam 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
Aesthetic Enjoyment	1.1	.0	.0	100.0
Aquatic Life	64.8	56.4	.0	43.6
Consumption	48.2	95.2	.0	4.8
Drinking Water	.1	.0	.0	100.0
Drinking Water (With Treatment)	1.1	.0	.0	100.0
Limited Body Contact Recreation	28.6	83.4	.0	16.6
Whole Body Contact Recreation	27.2	92.8	.0	7.2

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Site-specific Targeted Monitoring Results

Causes of Impairment
Guam Rivers and Streams 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Turbidity	Turbidity	21.8
Escherichia Coli (E. Coli)	Pathogens	6.2
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	5.5
Enterococcus Bacteria	Pathogens	1.6
Nitrates	Nutrients	1.4
Salinity	Salinity/Total Dissolved Solids/Chlorides/Sulfates	1.3
Total Suspended Solids (TSS)	Turbidity	1.3
PCB(s) in Fish Tissue	Polychlorinated Biphenyls (PCBs)	1.2
Copper	Metals (other than Mercury)	1.1
Temperature, Water	Temperature	1.1
Zinc	Metals (other than Mercury)	1.1
Aluminum	Metals (other than Mercury)	1.1
Iron	Metals (other than Mercury)	1.1
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	1.1
Chromium, Total	Metals (other than Mercury)	1.1
Total Coliform	Pathogens	1.1
Nickel	Metals (other than Mercury)	1.1
Ammonia, Un-ionized	Ammonia	1.1
Manganese	Metals (other than Mercury)	1.1

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Site-specific Targeted Monitoring Results

Probable Sources
Guam Rivers and Streams 2010

No probable sources of impairments reported.

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Site-specific Targeted Monitoring Results

Guam Bays and Estuaries 2010

Description of this table

Assessed Status	Square Miles

Assessed	35.1
Unassessed	879.9
Total Square Miles	915.0

Description of this table

Attainment Status	Square Miles

Good	20.4
Threatened	.0
Impaired	14.8
Total Square Miles Assessed	35.1

Description of this table

TMDL Development Status	Square Miles

All TMDLs completed	.0
TMDL alternative	.0
Non-pollutant impairment	.0
TMDL needed	14.8
Total Threatened and Impaired	14.8

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Guam Bays and Estuaries 2010

* 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
					% Impaired
Aquatic Life	32.7	91.8	.0	8.2
Consumption	23.2	39.3	.0	60.7
Whole Body Contact Recreation	31.1	97.8	.0	2.2

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Site-specific Targeted Monitoring Results

Causes of Impairment
Guam Bays and Estuaries 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Square Miles Threatened or Impaired
PCB(s) in Fish Tissue	Polychlorinated Biphenyls (PCBs)	11.7
Dieldrin	Pesticides	2.0
Trichloroethylene (TCE)	Toxic Organics	2.0
Antimony	Toxic Inorganics	2.0
Tetrachloroethylene	Toxic Organics	2.0
Arsenic	Metals (other than Mercury)	2.0
Chlordane	Pesticides	2.0
Nitrates	Nutrients	.7
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	.7
Enterococcus Bacteria	Pathogens	.7
Chlordane in Fish Tissue	Pesticides	.6
Dioxin (Including 2,3,7,8-TCDD)	Dioxins	.6
Toxic Seafood Advisory (Seaweed)	Other Cause	.4

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Site-specific Targeted Monitoring Results

Probable Sources
Guam Bays and Estuaries 2010

No probable sources of impairments reported.

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Site-specific Targeted Monitoring Results

Guam Coastal Shoreline 2010

Description of this table

Assessed Status	Miles

Assessed	16.1
Unassessed	100.4
Total Miles	116.5

Description of this table

Attainment Status	Miles

Good	.0
Threatened	.0
Impaired	16.1
Total Miles Assessed	16.1

Description of this table

TMDL Development Status	Miles

All TMDLs completed	5.8
TMDL alternative	.0
Non-pollutant impairment	.0
TMDL needed	10.3
Total Threatened and Impaired	16.1

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Guam 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
Consumption	.7	.0	.0	100.0
Whole Body Contact Recreation	15.5	.0	.0	100.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Guam Coastal Shoreline 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Enterococcus Bacteria	Pathogens	15.5
PCB(s) in Fish Tissue	Polychlorinated Biphenyls (PCBs)	.7

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Site-specific Targeted Monitoring Results

Probable Sources
Guam Coastal Shoreline 2010

No probable sources of impairments reported.

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Site-specific Targeted Monitoring Results

Guam Wetlands 2010

Description of this table

Assessed Status	Acres

Assessed	6.4
Unassessed	1,789.0
Total Acres	1,795.4

Description of this table

Attainment Status	Acres

Good	.0
Threatened	.0
Impaired	6.4
Total Acres Assessed	6.4

Description of this table

TMDL Development Status	Acres

All TMDLs completed	.0
TMDL alternative	.0
Non-pollutant impairment	.0
TMDL needed	6.4
Total Threatened and Impaired	6.4

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Guam Wetlands 2010

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

Description of this table

Designated Use	Acres Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Consumption	6.4	.0	.0	100.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
Guam Wetlands 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
PCB(s) in Fish Tissue	Polychlorinated Biphenyls (PCBs)	6.4

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Site-specific Targeted Monitoring Results

Probable Sources
Guam Wetlands 2010

No probable sources of impairments reported.

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Guam Causes of Impairment for Reporting Year 2010

Description of this table

Cause of Impairment Group	Size of Assessed Waters with Listed Causes of Impairment
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	Rivers and Streams (Miles)	Bays and Estuaries (Square Miles)	Coastal Shoreline (Miles)	Wetlands (Acres)
Ammonia	1.1
Dioxins		.6
Metals (other than Mercury)	1.1	2.0
Nutrients	1.4	.7
Organic Enrichment/Oxygen Depletion	5.5	.7
Other Cause		.4
Pathogens	6.7	.7	15.5
Pesticides		2.6
Polychlorinated Biphenyls (PCBs)	1.2	11.7	.7	6.4
Salinity/Total Dissolved Solids/Chlorides/Sulfates	1.3
Temperature	1.1
Toxic Inorganics		2.0
Toxic Organics		2.0
Turbidity	22.9

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Guam Probable Sources Contributing to Impairments
for Reporting Year 2010

No probable sources reported.

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Guam TMDL Alternatives by Cause of Impairment 2010

No TMDL Alternatives reported.

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Guam 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.

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Guam Causes of Impairment for 303(d) Listed Waters

Description of this table

Cause of Impairment Group Name	Number of Causes of Impairment Reported
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.
Pathogens	37
Metals (other than Mercury)	15
Polychlorinated Biphenyls (PCBs)	12
Nutrients	5
Salinity/Total Dissolved Solids/Chlorides/Sulfates	5
Organic Enrichment/Oxygen Depletion	5
Turbidity	4
Pesticides	3
Toxic Organics	2
Ammonia	2
Temperature	2
Toxic Inorganics	1
Other Cause	1

Total: 94 Causes of Impairment

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Guam Cumulative TMDLs by Pollutant

This chart includes TMDLs since October 1, 1995.

Description of this table

Pollutant	Number of TMDLs	Number of Causes of Impairment Addressed
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.
Enterococcus Bacteria	17	17
Sediment	1	1

Total: 18 TMDLs; 18 Causes of Impairment Addressed

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Guam Cumulative Number of TMDLs

EPA Fiscal Year starts October 1 and ends September 30.

Description of this table

Fiscal Year	Number of TMDLs	Number of Causes of Impairment Addressed
NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year.
2007	1	1
2010	17	17

Total: 18 TMDLs; 18 Causes of Impairment Addressed

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TMDL Document Search

Full Text Search of TMDL Documents

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