Louisiana Impaired Waters and TMDL Information

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Data are also available for these cycles:
2004 2006 2008 2010

For More Information:

Louisiana Assessment Report
State Water Quality Program

Assessed Waters of Louisiana by Watershed

Select a watershed from the list:

Search for a waterbody within Louisiana

Year Attaining	Number of Waters Attaining	Number of Causes of Impairment Addressed
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.
2005	17	23
2011	51	62

Cause of Impairment Group Name	Number of Causes of Impairment Reported
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.
Organic Enrichment/Oxygen Depletion	117
Pathogens	108
Nutrients	77
Mercury	64
Metals (other than Mercury)	35
Turbidity	32
Sediment	21
Salinity/Total Dissolved Solids/Chlorides/Sulfates	20
Pesticides	14
Oil and Grease	13
pH/Acidity/Caustic Conditions	5
Ammonia	3
Toxic Organics	2
Taste, Color and Odor	1
Chlorine	1
Polychlorinated Biphenyls (PCBs)	1

Total: 514 Causes of Impairment

This chart includes TMDLs since October 1, 1995.

Pollutant	Number of TMDLs	Number of Causes of Impairment Addressed
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.
Fecal Coliform	102	102
Oxygen Demand	97	97
Total Suspended Solids (TSS)	67	67
Nutrients Oxygen Demand	41	41
Phosphorus, Total	41	41
Dissolved Oxygen	33	33
Turbidity	32	32
Mercury in Fish Tissue	31	31
Mercury	29	29
Total Dissolved Solids (TDS)	29	29
Carbofuran	26	26
Biochemical Oxygen Demand (BOD)	25	25
Nutrients	21	21
Lead	18	18
Nitrogen	17	17
Nitrogen, Total	16	16
Siltation	15	15
Sulfates	11	11
Ammonia	10	10
Organic Enrichment/Low Dissolved Oxygen	7	7
Chlorides	6	6
Copper	6	6
Fipronil	6	6
Chloride	5	5
DDT	5	5
Ammonia Nitrogen	4	4
Phosphorus	4	4
Sulfate	4	4
Carbonaceous Bod	3	3
Dioxin	3	3
Nitrate	3	3
Noxious Aquatic Plants	3	3
Sedimentation/Siltation	3	4
Contaminated Sediments (Mercury)	2	2
Nitrite/Nitrate	2	2
Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems)	2	2
Salinity/Total Dissolved Solids	2	2
Sediment	2	2
Toxaphene	2	2
1,2-Dichloroethane	1	1
4,4'-DDT	1	1
Contaminated Sediments	1	1
Contaminated Sediments (PAHs)	1	1
Hexachlorobenzene	1	1
Hexachlorobutadiene	1	1
Inorganic Phosphorus	1	1
Methyl Parathion	1	1
Nickel	1	1
PCB(s) in Fish Tissue	1	1
Phenol	1	1
Priority Organics Compounds	1	1
Temperature	1	1
Tetrachloroethane	1	1
Zinc	1	1

Total: 750 TMDLs; 751 Causes of Impairment Addressed

EPA Fiscal Year starts October 1 and ends September 30.

Fiscal Year	Number of TMDLs	Number of Causes of Impairment Addressed
NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year.
1998	2	2
2000	42	42
2001	124	124
2002	200	200
2003	16	16
2004	21	21
2005	18	18
2006	17	17
2007	108	109
2008	85	85
2009	32	32
2010	7	7
2011	32	32
2012	46	46

Total: 750 TMDLs; 751 Causes of Impairment Addressed