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- 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
2008
2010
Waterbody Changes from Prior Cycle
For More Information:
Mississippi Assessment Report
State Water Quality Program
Mississippi Impaired Waters and TMDL Information
Assessed Waters of Mississippi by Watershed
Search for a waterbody within Mississippi
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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 2006 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 |  191 |
| Sediment | 125 |
| Nutrients | 118 |
| Organic Enrichment/Oxygen Depletion | 98 |
| Pathogens | 35 |
| Cause Unknown | 19 |
| Pesticides | 9 |
| Mercury | 7 |
| Total Toxics | 5 |
| Metals (other than Mercury) | 3 |
| Toxic Organics | 2 |
| Oil and Grease | 1 |
| Ammonia | 1 |
Total: 614 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