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- District Of Columbia 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:
District Of Columbia Assessment Report
State Water Quality Program
District Of Columbia Water Quality Assessment Report
Assessed Waters of District Of Columbia by Watershed
Search for a waterbody within District Of Columbia
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
District Of Columbia (2008)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
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| Good Waters | |||||||||||||||
| Previously impaired waters now attaining all uses |
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| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 38.4 | 238.4 | 5.9 | ||||||||||||
| TMDL completed | 19.3 | ||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 19.1 | 238.4 | 5.9 | ||||||||||||
| New TMDLs completed | .0 | .0 | .8 | ||||||||||||
| Remaining TMDLs needed | 19.1 | 238.4 | 5.1 | ||||||||||||
 |
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| Total Assessed Waters | 38.4 | 238.4 | 5.9 | ||||||||||||
| Total Waters | 39.0 | 238.4 | 6.0 | ||||||||||||
| Percent of Waters Assessed | 98.5 | 100.0 | 98.8 | ||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2008
Site-specific Targeted Monitoring Results
District Of Columbia Rivers and Streams 2008
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia 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 |
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 % Impaired |
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| Navigation | 9.5 | 100.0 | .0 | .0 | |
| Primary Contact Recreation | 38.4 | .0 | .0 | 100.0 | |
| Protection And Propagation Of Fish, Shellfish And Wildlife | 34.1 | .0 | .0 | 100.0 | |
| Protection Of Human Health Related To Consumption Of Fish And Shellfish | 36.4 | 5.8 | .0 | 94.2 | |
| Secondary Contact Recreation And Aesthetic Enjoyment | 38.4 | 7.3 | .0 | 92.7 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Rivers and Streams 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Fecal Coliform | Pathogens | 38.4 |
| Combination Benthic/Fishes Bioassessments | Cause Unknown - Impaired Biota | 32.4 |
| Particle Distribution (Embeddedness) | Sediment | 26.3 |
| Other Flow Regime Alterations | Flow Alteration(s) | 17.9 |
| Debris/Floatables/Trash | Trash | 14.8 |
| Combined Biota/Habitat Bioassessments (Streams) | Cause Unknown - Impaired Biota | 13.0 |
| Alterations in Wetland Habitats | Habitat Alterations | 6.2 |
| Alteration in Stream-Side or Littoral Vegetative Covers | Habitat Alterations | 5.1 |
| Benthic Macroinvertebrates Bioassessments | Cause Unknown - Impaired Biota | 4.5 |
| Fish Bioassessments | Cause Unknown - Impaired Biota | 4.5 |
| Total Suspended Solids (TSS) | Turbidity | 3.7 |
| Oil and Grease | Oil and Grease | 1.7 |
| Habitat Assessment (Streams) | Cause Unknown - Impaired Biota | 1.0 |
| Physical Substrate Habitat Alterations | Habitat Alterations | .7 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Rivers and Streams 2008
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Residential Districts | Urban-Related Runoff/Stormwater | 29.2 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 23.5 |
| Wet Weather Discharges (Non-Point Source) | Urban-Related Runoff/Stormwater | 17.0 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 17.0 |
| Hydrostructure Impacts On Fish Passage | Hydromodification | 15.4 |
| Source Unknown | Unknown | 15.1 |
| Yard Maintenance | Urban-Related Runoff/Stormwater | 13.9 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 12.2 |
| Illegal Dumps Or Other Inappropriate Waste Disposal | Spills/Dumping | 11.4 |
| Illegal Dumping | Spills/Dumping | 9.9 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | 9.5 |
| Post-Development Erosion And Sedimentation | Hydromodification | 8.5 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 5.8 |
| Channelization | Hydromodification | 5.6 |
| Site Clearance (Land Development Or Redevelopment) | Construction | 5.3 |
| Cercla Npl (Superfund) Sites | Legacy/Historical Pollutants | 1.6 |
| Loss Of Riparian Habitat | Habitat Alterations (Not Directly Related To Hydromodification) | 1.2 |
| Above Ground Storage Tank Leaks (Tank Farms) | Spills/Dumping | .9 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | .9 |
| Landfills | Land Application/Waste Sites/Tanks | .6 |
Site-specific Targeted Monitoring Results
District Of Columbia Lakes, Reservoirs, and Ponds 2008
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia Lakes, Reservoirs, and Ponds 2008
* 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 |
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| Navigation | 238.4 | 100.0 | .0 | .0 | |
| Primary Contact Recreation | 238.4 | .0 | .0 | 100.0 | |
| Protection And Propagation Of Fish, Shellfish And Wildlife | 238.4 | 54.5 | .0 | 45.5 | |
| Protection Of Human Health Related To Consumption Of Fish And Shellfish | 238.4 | .0 | .0 | 100.0 | |
| Secondary Contact Recreation And Aesthetic Enjoyment | 238.4 | 45.5 | .0 | 54.5 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Lakes, Reservoirs, and Ponds 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Fecal Coliform | Pathogens | 238.4 |
| Oil and Grease | Oil and Grease | 102.7 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Lakes, Reservoirs, and Ponds 2008
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 238.4 |
| Combined Sewer Overflows | Municipal Discharges/Sewage | 102.7 |
Site-specific Targeted Monitoring Results
District Of Columbia Bays and Estuaries 2008
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia Bays and Estuaries 2008
* 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 |
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| Navigation | 5.9 | 100.0 | .0 | .0 | |
| Primary Contact Recreation | 5.9 | .0 | .0 | 100.0 | |
| Protection And Propagation Of Fish, Shellfish And Wildlife | 5.9 | 70.0 | .0 | 30.0 | |
| Protection Of Human Health Related To Consumption Of Fish And Shellfish | 5.9 | .0 | .0 | 100.0 | |
| Secondary Contact Recreation And Aesthetic Enjoyment | 5.9 | 86.5 | .0 | 13.5 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Bays and Estuaries 2008
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Fecal Coliform | Pathogens | 5.9 |
| Oil and Grease | Oil and Grease | .8 |
| Biochemical Oxygen Demand (BOD) | Organic Enrichment/Oxygen Depletion | .3 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Bays and Estuaries 2008
Description of this table
| Probable Source | Probable Source Group | Square Miles Threatened or Impaired |
|---|---|---|
| Combined Sewer Overflows | Municipal Discharges/Sewage | 5.6 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 5.2 |
| Municipal Point Source Discharges | Municipal Discharges/Sewage | 4.4 |
| Source Unknown | Unknown | 1.4 |
| Highway/Road/Bridge Runoff (Non-Construction Related) | Urban-Related Runoff/Stormwater | .8 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | .4 |
District Of Columbia 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) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
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| Cause Unknown - Impaired Biota | 32.4 | ||||||||||||||
| Flow Alteration(s) | 17.9 | ||||||||||||||
| Habitat Alterations | 10.6 | ||||||||||||||
| Oil and Grease | 1.7 | 102.7 | .8 | ||||||||||||
| Organic Enrichment/Oxygen Depletion | .3 | ||||||||||||||
| Pathogens | 38.4 | 238.4 | 5.9 | ||||||||||||
| Sediment | 26.3 | ||||||||||||||
| Trash | 14.8 | ||||||||||||||
| Turbidity | 3.7 | ||||||||||||||
District Of Columbia 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) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
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| Construction | 5.3 | ||||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 1.2 | ||||||||||||||
| Hydromodification | 25.4 | ||||||||||||||
| Land Application/Waste Sites/Tanks | .6 | ||||||||||||||
| Legacy/Historical Pollutants | 1.6 | ||||||||||||||
| Municipal Discharges/Sewage | 17.9 | 102.7 | 5.6 | ||||||||||||
| Spills/Dumping | 11.4 | ||||||||||||||
| Unknown | 15.1 | 1.4 | |||||||||||||
| Urban-Related Runoff/Stormwater | 35.2 | 238.4 | 5.6 | ||||||||||||
District Of Columbia TMDL Alternatives by Cause of Impairment 2008
No TMDL Alternatives reported.
District Of Columbia 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.
District Of Columbia 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 | 25 |
| Other Cause | 7 |
| Sediment | 7 |
| Habitat Alterations | 6 |
| Oil and Grease | 4 |
| Flow Alteration(s) | 4 |
| Cause Unknown - Impaired Biota | 1 |
| Organic Enrichment/Oxygen Depletion | 1 |
Total: 55 Causes of Impairment
District Of Columbia 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 |
|---|---|---|
| DDT |  25 |
25 |
| Dieldrin | 25 |
25 |
| Heptachlor Epoxide | 25 |
25 |
| PAH1 - 2 & 3 Ring Polycyclic Aromatic Hydrocarbons | 25 |
25 |
| PAH2 - 4 Ring Polycyclic Aromatic Hydrocarbons | 25 |
25 |
| PAH3 - 5 && Ring Polycyclic Aromatic Hydrocarbons | 25 |
25 |
| Chlordane | 24 |
24 |
| DDE | 24 |
24 |
| DDD | 23 |
23 |
| Fecal Coliform | 23 |
23 |
| Polychlorinated Biphenyls (PCBs) | 19 |
19 |
| Copper | 16 |
16 |
| Lead | 16 |
16 |
| Zinc | 16 |
16 |
| Arsenic | 14 |
14 |
| Pathogens | 9 |
9 |
| Biochemical Oxygen Demand (BOD) | 6 |
6 |
| Suspended Solids | 5 |
5 |
| Oil and Grease | 4 |
4 |
| Suspended Sediment | 4 |
4 |
| Nitrogen | 3 |
3 |
| Phosphorus | 3 |
3 |
| Mercury | 2 |
2 |
| Total Suspended Solids (TSS) | 2 |
2 |
| Toxics | 2 |
2 |
| Trash | 2 |
2 |
| pH | 2 |
2 |
| Nitrogen, Total | 1 |
1 |
| Phosphorus, Total | 1 |
1 |
Total: 371 TMDLs; 371 Causes of Impairment Addressed
District Of Columbia 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 |
|---|---|---|
| 1999 | 1 |
1 |
| 2002 | 7 |
7 |
| 2003 | 129 |
129 |
| 2004 | 151 |
151 |
| 2005 | 60 |
60 |
| 2007 | 2 |
2 |
| 2008 | 11 |
11 |
| 2010 | 2 |
2 |
| 2011 | 6 |
6 |
| 2012 | 2 |
2 |
Total: 371 TMDLs; 371 Causes of Impairment Addressed