2006 Section 303(d) List Fact Sheet for MARYLAND

Other Impaired Water 303(d) List Information
The most current report available is 2006
Data are also available for these years: 2004 2002 1998

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List Status

APPROVED by EPA on DEC-20-2006.

Waterbody Type	Number of Waters on List
NOTE: Click on the underlined "Number of Waters on List" value to see a listing of those waters.
STREAM/CREEK/RIVER	384
TIDAL STREAM	43
BAY	23
COASTAL SHORELINES	11
ESTUARY	11
LAKE/RESERVOIR/POND	11
BAY/ESTUARY	9
SOUND	4
HARBOR	3
CREEK	2

Total Number of Impaired Waters Reported: 501

Watershed Name	Number of Waters on List	Percent of Reported
NOTE: Click on the underlined "Watershed Name" to view a Watershed report. Click on the underlined "Number of Waters on List" value to see a listing of those waters.
Blackwater-Wicomico	7	1.40
Brandywine-Christina	1	.20
Cacapon-Town	9	1.80
Chester-Sassafras	23	4.59
Chincoteague	4	.80
Choptank	2	.40
Conococheague-Opequon	6	1.20
Gunpowder-Patapsco	26	5.19
Lower Potomac	10	2.00
Lower Susquehanna	8	1.60
Middle Potomac-Anacostia-Occoquan	5	1.00
Middle Potomac-Catoctin	5	1.00
Monocacy	2	.40
Nanticoke	3	.60
North Branch Potomac	4	.80
Not Reported	344	68.66
Patuxent	14	2.79
Pocomoke	9	1.80
Severn	8	1.60
Youghiogheny	13	2.59

Total Number of Impaired Waters Reported: 501

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General Impairment Name	Cause of Impairment Reported	Percent of Reported
NOTE: Click on the underlined "Cause of Impairment Reported" value to see a listing of those waters with that cause of impairment. Click on the underlined "General Impairment Name" to see the detailed state-reported impairment names.
CAUSE UNKNOWN - IMPAIRED BIOTA	371	57.43
SEDIMENT	90	13.93
NUTRIENTS	83	12.85
PATHOGENS	49	7.59
TOTAL TOXICITY	29	4.49
MERCURY	13	2.01
PH	9	1.39
TRASH	2	.31

Total Number of Causes of Impairment Reported: 646

Priority	Cause of Impairment Reported	Percent of Reported
NOTE: Click on the underlined "Cause of Impairment Reported" value to see a listing of those waters with that impairment priority.
LOW	384	59.44
NOT REPORTED	193	29.88
HIGH	40	6.19
MEDIUM	29	4.49

Total Number of Causes of Impairment Reported: 646

Pollutant	Number of TMDLs Approved	Percent of Reported
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 Approved" value to see a listing of those approved TMDLs for the pollutant. EPA is in the process of collecting TMDL information from the states. Because these efforts are on-going, there may be additional approved TMDLs that were not included in the listings below.
ALUMINUM	78	12.83
IRON	78	12.83
SULFATE	77	12.66
NITRATE	77	12.66
AMMONIUM	76	12.50
FECAL COLIFORM	67	11.02
PHOSPHORUS	41	6.74
NITROGEN	31	5.10
SUSPENDED SEDIMENT	19	3.13
SEDIMENT	12	1.97
E. COLI	12	1.97
BIOLOGICAL	5	.82
CBOD	5	.82
BOD	4	.66
METHYL MERCURY	4	.66
MERCURY	3	.49
CHLORDANE	3	.49
PCBS	3	.49
LEAD	2	.33
SULFATES	1	.16
AMMONIA	1	.16
PH	1	.16
DISSOLVED OXYGEN	1	.16
AMMONIUM	1	.16
PATHOGENS	1	.16
NOD (NITROGEN OXYGEN DEMAND)	1	.16
HEPTACHLOR	1	.16
BACTERIA	1	.16
CADMIUM	1	.16
NUTRIENTS	1	.16

Total Number of TMDLs Reported to EPA since October 1, 1995: 608

TMDL Document Search

Full Text Search of TMDL Documents is available here.

The following agencies may also have relevant environmental information:

U. S. Geological Survey Data
Maryland Department of the Environment - Introduction to Maryland's TMDL Program