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• N. Mariana Islands Water Quality Assessment Report

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Site-specific Targeted Monitoring Summary Results

N. Mariana Islands (2010)

Description of this table

	Size of Water
	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)	Coastal Shoreline (Miles)	Wetlands (Acres)
Good Waters	73.4		150.4	43.3
Previously impaired waters       now attaining all uses			.0
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters		45.2	84.9	516.2
TMDL completed
TMDL alternative
Non-pollutant impairment				516.2
TMDL needed		45.2	84.9
New TMDLs completed	.0	.0	.0	.0
Remaining TMDLs needed		45.2	84.9
Total Assessed Waters	73.4	45.2	235.3	559.5
Total Waters	Unavailable	Unavailable	Unavailable	Unavailable
Percent of Waters Assessed	Unavailable	Unavailable	Unavailable	Unavailable

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

Site-specific Targeted Monitoring Results

N. Mariana Islands Rivers and Streams 2010

Description of this table Pie chart not displayed because total size for Rivers and Streams is unavailable. Assessed Status Miles Assessed 73.4 Unassessed Unavailable Total Miles Unavailable

Description of this table Attainment Status Miles Good 73.4 Threatened .0 Impaired .0 Total Miles Assessed 73.4

Description of this table TMDL Development Status Miles All TMDLs completed .0 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed .0 Total Threatened and Impaired .0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
N. Mariana Islands 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, Others	73.4	100.0	.0	.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
N. Mariana Islands Rivers and Streams 2010

No causes of impairment reported.

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Site-specific Targeted Monitoring Results

Probable Sources
N. Mariana Islands Rivers and Streams 2010

No probable sources of impairments reported.

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Site-specific Targeted Monitoring Results

N. Mariana Islands Lakes, Reservoirs, and Ponds 2010

Description of this table Pie chart not displayed because total size for Lakes, Reservoirs, and Ponds is unavailable. Assessed Status Acres Assessed 45.2 Unassessed Unavailable Total Acres Unavailable

Description of this table Attainment Status Acres Good .0 Threatened .0 Impaired 45.2 Total Acres Assessed 45.2

Description of this table TMDL Development Status Acres All TMDLs completed .0 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed 45.2 Total Threatened and Impaired 45.2

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
N. Mariana Islands Lakes, Reservoirs, and Ponds 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
Aesthetic, Others	45.2	100.0	.0	.0
Potable Water	45.2	.0	.0	100.0
Recreation	45.2	.0	.0	100.0

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Site-specific Targeted Monitoring Results

Causes of Impairment
N. Mariana Islands Lakes, Reservoirs, and Ponds 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Escherichia Coli (E. Coli)	Pathogens	45.2

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Site-specific Targeted Monitoring Results

Probable Sources
N. Mariana Islands Lakes, Reservoirs, and Ponds 2010

Description of this table

Probable Source	Probable Source Group	Acres Threatened or Impaired
Source Unknown	Unknown	45.2

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Site-specific Targeted Monitoring Results

N. Mariana Islands Coastal Shoreline 2010

Description of this table Pie chart not displayed because total size for Coastal Shoreline is unavailable. Assessed Status Miles Assessed 235.3 Unassessed Unavailable Total Miles Unavailable

Description of this table Attainment Status Miles Good 150.4 Threatened .0 Impaired 84.9 Total Miles Assessed 235.3

Description of this table TMDL Development Status Miles All TMDLs completed .0 TMDL alternative .0 Non-pollutant impairment .0 TMDL needed 84.9 Total Threatened and Impaired 84.9

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
N. Mariana Islands 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
Aesthetic, Others	235.3	100.0	.0	.0
Aquatic Life	208.4	59.3	.0	40.7
Fish Consumption	126.5	97.6	.0	2.4
Recreation	205.1	74.7	.0	25.3

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Site-specific Targeted Monitoring Results

Causes of Impairment
N. Mariana Islands Coastal Shoreline 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Phosphate	Nutrients	84.9
Enterococcus Bacteria	Pathogens	51.8
Dissolved Oxygen Saturation	Organic Enrichment/Oxygen Depletion	37.6
Biological Criteria	Cause Unknown - Impaired Biota	34.7
Mercury in Fish Tissue	Mercury	3.0

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Site-specific Targeted Monitoring Results

Probable Sources
N. Mariana Islands Coastal Shoreline 2010

Description of this table

Probable Source	Probable Source Group	Miles Threatened or Impaired
Clean Sediments	Hydromodification	36.1
Source Unknown	Unknown	31.3
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems)	Municipal Discharges/Sewage	28.8
Urban Runoff/Storm Sewers	Urban-Related Runoff/Stormwater	28.2
Livestock (Grazing Or Feeding Operations)	Agriculture	16.9
Sanitary Sewer Overflows (Collection System Failures)	Municipal Discharges/Sewage	15.8
Non-Point Source	Unspecified Nonpoint Source	10.8
Municipal Point Source Discharges	Municipal Discharges/Sewage	5.7
Landfills	Land Application/Waste Sites/Tanks	4.1

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Site-specific Targeted Monitoring Results

N. Mariana Islands Wetlands 2010

Description of this table Pie chart not displayed because total size for Wetlands is unavailable. Assessed Status Acres Assessed 559.5 Unassessed Unavailable Total Acres Unavailable

Description of this table Attainment Status Acres Good 43.3 Threatened .0 Impaired 516.2 Total Acres Assessed 559.5

Description of this table TMDL Development Status Acres All TMDLs completed .0 TMDL alternative .0 Non-pollutant impairment 516.2 TMDL needed .0 Total Threatened and Impaired 516.2

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
N. Mariana Islands 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
Aquatic Life	559.5	7.7	.0	92.3

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Site-specific Targeted Monitoring Results

Causes of Impairment
N. Mariana Islands Wetlands 2010

Description of this table

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Other Flow Regime Alterations	Flow Alteration(s)	516.2
Alterations in Wetland Habitats	Habitat Alterations	516.2
Non-Native Aquatic Plants	Nuisance Exotic Species	516.2

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Site-specific Targeted Monitoring Results

Probable Sources
N. Mariana Islands Wetlands 2010

No probable sources of impairments reported.

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N. Mariana Islands 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)	Lakes, Reservoirs, and Ponds (Acres)	Coastal Shoreline (Miles)	Wetlands (Acres)
Cause Unknown - Impaired Biota			34.7
Flow Alteration(s)				516.2
Habitat Alterations				516.2
Mercury			3.0
Nuisance Exotic Species				516.2
Nutrients			84.9
Organic Enrichment/Oxygen Depletion			37.6
Pathogens		45.2	51.8

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N. Mariana Islands 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)	Lakes, Reservoirs, and Ponds (Acres)	Coastal Shoreline (Miles)	Wetlands (Acres)
Agriculture			16.9
Hydromodification			36.1
Land Application/Waste Sites/Tanks			4.1
Municipal Discharges/Sewage			43.3
Unknown		45.2	31.3
Unspecified Nonpoint Source			10.8
Urban-Related Runoff/Stormwater			28.2

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N. Mariana Islands TMDL Alternatives by Cause of Impairment 2010

No TMDL Alternatives reported.

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N. Mariana Islands 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
2011	4	4

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N. Mariana Islands 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
Nutrients	33
Pathogens	13
Organic Enrichment/Oxygen Depletion	11
Mercury	1

Total: 58 Causes of Impairment

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N. Mariana Islands 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

Total: 0 TMDLs; Causes of Impairment Addressed

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N. Mariana Islands 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

Total: 0 TMDLs; Causes of Impairment Addressed

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