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- Mississippi 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:
Mississippi Assessment Report
State Water Quality Program
Mississippi Water Quality Assessment Report
Assessed Waters of Mississippi by Watershed
Search for a waterbody within Mississippi
NOTE: The data and information provided on this web site may differ from the information provided in the original Mississippi 2010 Section 305(b) Report. This is a result of differences in the way the state's assessment database tracks information and how the national data system prepares summary reports. Mississippi's 2010 Section 305(b) Water Quality Report is available via http://deq.state.ms.us/MDEQ.nsf/page/FS_SurfaceWaterQualityAssessments.
Information on Mississippi's TMDL program and Section 303(d) List is available via http://deq.state.ms.us/MDEQ.nsf/page/TWB_Total_Maximum_Daily_Load_Section
NOTE: The data and information provided on this web site may differ from the information provided in the original Mississippi 2010 Section 305(b) Report. This is a result of differences in the way the state's assessment database tracks information and how the national data system prepares summary reports. Mississippi's 2010 Section 305(b) Water Quality Report is available via http://deq.state.ms.us/MDEQ.nsf/page/FS_SurfaceWaterQualityAssessments.
Information on Mississippi's TMDL program and Section 303(d) List is available via http://deq.state.ms.us/MDEQ.nsf/page/TWB_Total_Maximum_Daily_Load_Section
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- Pollution Categories Summary Document
Site-specific Targeted Monitoring Summary Results
Mississippi (2010)
Description of this table| Size of Water | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Coastal Shoreline (Miles) |
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| Good Waters | 1,670.6 | 22.8 | |||||||||||||
| Previously impaired waters now attaining all uses |
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| Threatened Waters | |||||||||||||||
| TMDL completed | |||||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | |||||||||||||||
| Impaired Waters | 2,182.8 | 36,806.9 | 3.8 | ||||||||||||
| TMDL completed | 1,089.5 | 36,347.6 | |||||||||||||
| TMDL alternative | |||||||||||||||
| Non-pollutant impairment | |||||||||||||||
| TMDL needed | 1,093.4 | 459.3 | 3.8 | ||||||||||||
| New TMDLs completed | 165.3 | 459.3 | .0 | ||||||||||||
| Remaining TMDLs needed | 928.1 | .0 | 3.8 | ||||||||||||
 |
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| Total Assessed Waters | 3,853.4 | 36,806.9 | 26.6 | ||||||||||||
| Total Waters | 84,003.0 | 500,000.0 | 245.0 | ||||||||||||
| Percent of Waters Assessed | 4.6 | 7.4 | 10.8 | ||||||||||||
Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2010
Site-specific Targeted Monitoring Results
Mississippi Rivers and Streams 2010
Description of this table
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Mississippi 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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| Aquatic Life Use Support | 3,015.2 | 48.2 | .0 | 51.8 | |
| Fish Consumption | 414.3 | .0 | .0 | 100.0 | |
| Primary Contact Recreation | 235.6 | 37.2 | .0 | 62.8 | |
| Secondary Contact Recreation | 351.5 | 68.8 | .0 | 31.2 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Mississippi Rivers and Streams 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Biological Impairment | Cause Unknown - Impaired Biota | 934.3 |
| Sedimentation/Siltation | Sediment | 523.6 |
| Mercury in Fish Tissue | Mercury | 276.4 |
| Fecal Coliform | Pathogens | 259.5 |
| Organic Enrichment/Low Dissolved Oxygen | Organic Enrichment/Oxygen Depletion | 186.4 |
| Toxaphene | Pesticides | 124.5 |
| DDT in Fish Tissue | Pesticides | 124.5 |
| Nutrients | Nutrients | 60.3 |
| PCB(s) in Fish Tissue | Polychlorinated Biphenyls (PCBs) | 50.7 |
| Nitrogen, Total | Nutrients | 43.1 |
| Phosphorus, Total | Nutrients | 43.1 |
| Ammonia, Total | Ammonia | 31.2 |
| Ammonia, Un-ionized | Ammonia | 11.0 |
| Lead | Metals (other than Mercury) | 3.2 |
| Cadmium | Metals (other than Mercury) | 3.2 |
Site-specific Targeted Monitoring Results
Probable Sources
Mississippi Rivers and Streams 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Source Unknown | Unknown | 2,177.6 |
| Industrial Point Source Discharge | Industrial | 3.2 |
| Sediment Resuspension (Clean Sediment) | Hydromodification | 2.0 |
Site-specific Targeted Monitoring Results
Mississippi Lakes, Reservoirs, and Ponds 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Mississippi 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 |
|||||
| Fish Consumption | 36,806.9 | .0 | .0 | 100.0 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Mississippi Lakes, Reservoirs, and Ponds 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Acres Threatened or Impaired |
|---|---|---|
| Mercury in Fish Tissue | Mercury | 35,049.6 |
| Toxaphene | Pesticides | 1,757.3 |
| DDT in Fish Tissue | Pesticides | 1,757.3 |
Site-specific Targeted Monitoring Results
Probable Sources
Mississippi Lakes, Reservoirs, and Ponds 2010
Description of this table
| Probable Source | Probable Source Group | Acres Threatened or Impaired |
|---|---|---|
| Source Unknown | Unknown | 36,806.9 |
Site-specific Targeted Monitoring Results
Mississippi Coastal Shoreline 2010
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Site-specific Targeted Monitoring Results
Individual Designated Use Support
Mississippi 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 |
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| Primary Contact Recreation | 26.6 | 85.9 | .0 | 14.1 | |
Site-specific Targeted Monitoring Results
Causes of Impairment
Mississippi Coastal Shoreline 2010
Description of this table
| Cause of Impairment | Cause of Impairment Group | Miles Threatened or Impaired |
|---|---|---|
| Enterococcus Bacteria | Pathogens | 3.8 |
Site-specific Targeted Monitoring Results
Probable Sources
Mississippi Coastal Shoreline 2010
Description of this table
| Probable Source | Probable Source Group | Miles Threatened or Impaired |
|---|---|---|
| Source Unknown | Unknown | 3.8 |
Mississippi 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) |
|||||||||||||
| Ammonia | 42.1 | ||||||||||||||
| Cause Unknown - Impaired Biota | 934.3 | ||||||||||||||
| Mercury | 276.4 | 35,049.6 | |||||||||||||
| Metals (other than Mercury) | 3.2 | ||||||||||||||
| Nutrients | 103.4 | ||||||||||||||
| Organic Enrichment/Oxygen Depletion | 186.4 | ||||||||||||||
| Pathogens | 259.5 | 3.8 | |||||||||||||
| Pesticides | 124.5 | 1,757.3 | |||||||||||||
| Polychlorinated Biphenyls (PCBs) | 50.7 | ||||||||||||||
| Sediment | 523.6 | ||||||||||||||
Mississippi 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) |
|||||||||||||
| Hydromodification | 2.0 | ||||||||||||||
| Industrial | 3.2 | ||||||||||||||
| Unknown | 2,177.6 | 36,806.9 | 3.8 | ||||||||||||
Mississippi TMDL Alternatives by Cause of Impairment 2010
No TMDL Alternatives reported.
Mississippi 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 |
|---|---|---|
| 2005 | 21 |
27 |
| 2007 | 35 |
55 |
| 2008 | 3 |
3 |
Mississippi 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 | 153 |
| Pathogens | 17 |
| Organic Enrichment/Oxygen Depletion | 8 |
| Metals (other than Mercury) | 2 |
| Mercury | 2 |
Total: 182 Causes of Impairment
Mississippi 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 |
|---|---|---|
| Fecal Coliform |  207 |
208 |
| Siltation | 200 |
201 |
| Toxaphene | 153 |
155 |
| Biochemical Oxygen Demand (BOD) | 150 |
182 |
| DDT | 148 |
148 |
| Phosphorus, Total | 147 |
150 |
| Nitrogen, Total | 140 |
143 |
| Sediment | 132 |
137 |
| Ammonia, Un-ionized | 32 |
33 |
| Mercury | 28 |
32 |
| Toxicity | 14 |
16 |
| Escherichia Coli (E. Coli) | 12 |
12 |
| Carbonaceous Bod | 10 |
10 |
| Chronic Toxicity | 8 |
14 |
| Organic Enrichment/Low Dissolved Oxygen | 7 |
7 |
| Low pH | 6 |
6 |
| Nutrients | 5 |
5 |
| Phenol | 4 |
5 |
| Ammonia Nitrogen | 3 |
3 |
| Conductivity | 3 |
3 |
| Polychlorinated Biphenyls (PCBs) | 3 |
3 |
| Sedimentation/Siltation | 3 |
3 |
| Total Toxics | 3 |
3 |
| pH | 2 |
2 |
| 4,4'-DDT | 1 |
1 |
| Acute Toxicity | 1 |
1 |
| Aluminum | 1 |
1 |
| Carbofuran | 1 |
1 |
| Chlorine | 1 |
1 |
| Dioxin | 1 |
1 |
| Nitrogenous BOD | 1 |
1 |
| Oil and Grease | 1 |
1 |
| Pathogens | 1 |
1 |
| Pentachlorophenol (PCP) | 1 |
1 |
Total: 1,430 TMDLs; 1,491 Causes of Impairment Addressed
Mississippi 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 |
| 2000 | 78 |
79 |
| 2001 | 45 |
52 |
| 2002 | 28 |
29 |
| 2003 | 194 |
221 |
| 2004 | 35 |
37 |
| 2005 | 56 |
64 |
| 2006 | 253 |
257 |
| 2007 | 168 |
170 |
| 2008 | 364 |
373 |
| 2009 | 147 |
147 |
| 2010 | 23 |
23 |
| 2011 | 25 |
25 |
| 2012 | 13 |
13 |
Total: 1,430 TMDLs; 1,491 Causes of Impairment Addressed