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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
2008
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 (2010)
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 | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 38.4 | 238.4 | 5.9 | ||||||||||||
| New TMDLs completed | .0 | .0 | .0 | ||||||||||||
| Remaining TMDLs needed | 38.4 | 238.4 | 5.9 | ||||||||||||
 |
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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 2010
Site-specific Targeted Monitoring Results
District Of Columbia Rivers and Streams 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia 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 |
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 % Impaired |
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| Navigation | 9.5 | 100.0 | .0 | .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 | 38.4 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Rivers and Streams 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Cause Unknown | Cause Unknown | 38.4 |
| Combination Benthic/Fishes Bioassessments | Cause Unknown - Impaired Biota | 31.0 |
| Particle Distribution (Embeddedness) | Sediment | 24.9 |
| Other Flow Regime Alterations | Flow Alteration(s) | 16.5 |
| Debris/Floatables/Trash | Trash | 13.5 |
| Combined Biota/Habitat Bioassessments (Streams) | Cause Unknown - Impaired Biota | 11.6 |
| Alterations in Wetland Habitats | Habitat Alterations | 4.8 |
| Benthic Macroinvertebrates Bioassessments | Cause Unknown - Impaired Biota | 4.5 |
| Fish Bioassessments | Cause Unknown - Impaired Biota | 3.9 |
| Alteration in Stream-Side or Littoral Vegetative Covers | Habitat Alterations | 3.7 |
| Total Suspended Solids (TSS) | Turbidity | 3.7 |
| Habitat Assessment (Streams) | Cause Unknown - Impaired Biota | 1.0 |
| Physical Substrate Habitat Alterations | Habitat Alterations | .7 |
| Oil and Grease | Oil and Grease | .6 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Rivers and Streams 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Residential Districts | Urban-Related Runoff/Stormwater | 27.8 |
| Wet Weather Discharges (Point Source And Combination Of Stormwater, Sso Or Cso) | Municipal Discharges/Sewage | 17.0 |
| Wet Weather Discharges (Non-Point Source) | Urban-Related Runoff/Stormwater | 17.0 |
| Hydrostructure Impacts On Fish Passage | Hydromodification | 14.0 |
| Yard Maintenance | Urban-Related Runoff/Stormwater | 13.9 |
| Illegal Dumps Or Other Inappropriate Waste Disposal | Spills/Dumping | 11.4 |
| Impacts From Hydrostructure Flow Regulation/Modification | Hydromodification | 10.8 |
| Illegal Dumping | Spills/Dumping | 9.9 |
| Post-Development Erosion And Sedimentation | Hydromodification | 8.5 |
| Channelization | Hydromodification | 5.6 |
| Site Clearance (Land Development Or Redevelopment) | Construction | 5.3 |
| Cercla Npl (Superfund) Sites | Legacy/Historical Pollutants | 1.6 |
| Municipal (Urbanized High Density Area) | Urban-Related Runoff/Stormwater | 1.4 |
| Loss Of Riparian Habitat | Habitat Alterations (Not Directly Related To Hydromodification) | 1.2 |
| Discharges From Municipal Separate Storm Sewer Systems (Ms4) | Urban-Related Runoff/Stormwater | 1.0 |
| Landfills | Land Application/Waste Sites/Tanks | .6 |
| Source Unknown | Unknown | .6 |
Site-specific Targeted Monitoring Results
District Of Columbia Lakes, Reservoirs, and Ponds 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia 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 |
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| Navigation | 238.4 | 100.0 | .0 | .0 | |
| Protection And Propagation Of Fish, Shellfish And Wildlife | 238.4 | .0 | .0 | 100.0 | |
| Protection Of Human Health Related To Consumption Of Fish And Shellfish | 238.4 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Lakes, Reservoirs, and Ponds 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Cause Unknown | Cause Unknown | 238.4 |
| pH | pH/Acidity/Caustic Conditions | 135.7 |
| Dissolved Oxygen Saturation | Organic Enrichment/Oxygen Depletion | 102.7 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Lakes, Reservoirs, and Ponds 2010
No probable sources of impairments reported.
Site-specific Targeted Monitoring Results
District Of Columbia Bays and Estuaries 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
District Of Columbia 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 |
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| % Impaired |
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| Navigation | 5.9 | 100.0 | .0 | .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 | .8 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
District Of Columbia Bays and Estuaries 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Square Miles Threatened or Impaired |
|---|---|---|
| Cause Unknown | Cause Unknown | 5.6 |
| Debris/Floatables/Trash | Trash | .8 |
| Biochemical Oxygen Demand (BOD) | Organic Enrichment/Oxygen Depletion | .3 |
Site-specific Targeted Monitoring Results
Probable Sources
District Of Columbia Bays and Estuaries 2010
No probable sources of impairments reported.
District Of Columbia 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) |
Bays and Estuaries (Square Miles) |
|||||||||||||
| Cause Unknown | 38.4 | 238.4 | 5.6 | ||||||||||||
| Cause Unknown - Impaired Biota | 31.0 | ||||||||||||||
| Flow Alteration(s) | 16.5 | ||||||||||||||
| Habitat Alterations | 9.2 | ||||||||||||||
| Oil and Grease | .6 | ||||||||||||||
| Organic Enrichment/Oxygen Depletion | 102.7 | .3 | |||||||||||||
| pH/Acidity/Caustic Conditions | 135.7 | ||||||||||||||
| Sediment | 24.9 | ||||||||||||||
| Trash | 13.5 | .8 | |||||||||||||
| Turbidity | 3.7 | ||||||||||||||
District Of Columbia 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) |
Bays and Estuaries (Square Miles) |
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| Construction | 5.3 | ||||||||||||||
| Habitat Alterations (Not Directly Related To Hydromodification) | 1.2 | ||||||||||||||
| Hydromodification | 24.0 | ||||||||||||||
| Land Application/Waste Sites/Tanks | .6 | ||||||||||||||
| Legacy/Historical Pollutants | 1.6 | ||||||||||||||
| Municipal Discharges/Sewage | 17.0 | ||||||||||||||
| Spills/Dumping | 11.4 | ||||||||||||||
| Unknown | .6 | ||||||||||||||
| Urban-Related Runoff/Stormwater | 30.4 | ||||||||||||||
District Of Columbia TMDL Alternatives by Cause of Impairment 2010
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 |
|---|---|
| Cause Unknown - Impaired Biota | 37 |
| Cause Unknown | 35 |
| Sediment | 15 |
| Other Cause | 13 |
| Habitat Alterations | 9 |
| Flow Alteration(s) | 9 |
| pH/Acidity/Caustic Conditions | 2 |
| Organic Enrichment/Oxygen Depletion | 2 |
| Oil and Grease | 1 |
Total: 123 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