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On This Page 303(d) Listed Waters for 2012

Data are also available for these cycles:
2002 2004 2006 2008 2010

Waterbody Changes from Prior Cycle

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Louisiana Water Quality Assessment Report

Assessed Waters of Louisiana by Watershed

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Search for a waterbody within Louisiana
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Display impaired waters and TMDL information only



Site-specific Targeted Monitoring Summary Results

Louisiana (2012)

Description of this table
 
    2,568.2 39,176.0 813.5 558,080.0
       1,898.0 29,024.0 517.5
   
                          
                          
                          
                          
    6,912.3 629,671.0 4,140.0 467,200.0
           2,460.5     317,013.0     328.0     199,040.0
           227.3     21,888.0     1,996.0     
                          
           4,224.5     290,770.0     1,816.0     268,160.0
              .0     .0     .0     .0
                    4,224.5           290,770.0           1,816.0           268,160.0
9,480.5 668,847.0 4,953.5 1,025,280.0
66,294.0 1,078,031.0 7,656.0 7,784,200.0
14.3 62.0 64.7 13.2

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Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2012


Site-specific Targeted Monitoring Results

Louisiana Rivers and Streams 2012

Description of this table

All
Rivers and Streams

66,294.0 Miles of Rivers and Streams

Assessed 9,480.5
Unassessed 56,813.5
Total Miles 66,294.0







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Description of this table

Assessed
Rivers and Streams

9,480.5 Miles of
Assessed Rivers and Streams

Good 2,568.2
Threatened .0
Impaired 6,912.3
Total Miles Assessed 9,480.5







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Description of this table

Threatened and Impaired
Rivers and Streams

6,912.3 Miles of
Threatened and Impaired
Rivers and Streams

2,460.5
227.3
.0
4,224.5
Total Threatened and Impaired 6,912.3

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Louisiana Rivers and Streams 2012

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
% Good
% Threatened
% Impaired
Agriculture 2,022.0 100.0 .0 .0 color.gif
Drinking Water Supply 1,057.0 85.5 .0 14.5 color.gifcolor.gif
Fish And Wildlife Propagation 9,042.4 29.4 .0 70.6 color.gifcolor.gif
Limited Aquatic Life And Wildlife Use 90.1 21.3 .0 78.7 color.gifcolor.gif
Outstanding Natural Resource Waters 1,585.0 68.0 .0 32.0 color.gifcolor.gif
Oyster Propagation 470.0 24.7 .0 75.3 color.gifcolor.gif
Primary Contact Recreation 9,176.4 73.2 .0 26.8 color.gifcolor.gif
Secondary Contact Recreation 9,323.2 95.8 .0 4.2 color.gifcolor.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Louisiana Rivers and Streams 2012

Description of this table
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 4,535.9
Mercury in Fish Tissue Mercury color.gif 2,526.0
Fecal Coliform Pathogens color.gif 2,405.0
Turbidity Turbidity color.gif 2,252.6
Total Suspended Solids (TSS) Turbidity color.gif 1,650.0
Phosphorus, Total Nutrients color.gif 1,179.0
Total Dissolved Solids (TDS) Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 1,132.5
Sedimentation/Siltation Sediment color.gif 1,089.0
Nitrate/Nitrite (Nitrite + Nitrate as N) Nutrients color.gif 1,056.0
Carbofuran Pesticides color.gif 930.0
DDT Pesticides color.gif 749.0
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 623.0
Non-Native Aquatic Plants Nuisance Exotic Species color.gif 530.0
Lead Metals (other than Mercury) color.gif 516.0
Toxaphene Pesticides color.gif 420.0
Chloride Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 336.0
Foam/Flocs/Scum/Oil Slicks Other Cause color.gif 319.0
Fish Advisory - No Restriction Fish Consumption Advisory color.gif 319.0
Other Cause Other Cause color.gif 319.0
Fipronil Pesticides color.gif 252.0
pH, Low pH/Acidity/Caustic Conditions color.gif 207.0
Color Taste, Color and Odor color.gif 153.0
Temperature, Water Temperature color.gif 141.0
2,3,7,8-Tetrachlorodibenzofuran Dioxins color.gif 87.0
2,3,7,8-Tetrachlorodibenzo-P-Dioxin (Only) Dioxins color.gif 87.0
Methyl Parathion Pesticides color.gif 43.0
Atrazine Pesticides color.gif 43.0
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 41.0
Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems) Toxic Organics color.gif 29.0
1,2-Dichloroethane Pesticides color.gif 15.3
Benzo[a]pyrene (PAHs) Toxic Organics color.gif 13.0
Hexachlorobenzene Pesticides color.gif 12.0
Bromoform Toxic Organics color.gif 12.0
Hexachlorobutadiene Toxic Organics color.gif 12.0
1,1,1,2-Tetrachloroethane Toxic Organics color.gif 12.0
pH, High pH/Acidity/Caustic Conditions color.gif 11.0
Methoxychlor Pesticides color.gif 8.0
Phenols Toxic Organics color.gif 8.0
Copper Metals (other than Mercury) color.gif 8.0
1,1,2-Trichloroethane Toxic Organics color.gif 7.3
Chloroform Toxic Organics color.gif 7.3
Oil and Grease Oil and Grease color.gif 4.0

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Site-specific Targeted Monitoring Results

Probable Sources
Louisiana Rivers and Streams 2012

Description of this table
Source Unknown Unknown color.gif 3,834.6
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 2,526.0
Irrigated Crop Production Agriculture color.gif 1,920.0
Non-Irrigated Crop Production Agriculture color.gif 1,665.0
Natural Sources Natural/Wildlife color.gif 1,531.0
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 1,509.0
Natural Conditions - Water Quality Standards Use Attainability Analyses Needed Natural/Wildlife color.gif 1,018.0
Agriculture Agriculture color.gif 852.9
Municipal Point Source Discharges Municipal Discharges/Sewage color.gif 679.0
Drought-Related Impacts Natural/Wildlife color.gif 678.0
Package Plant Or Other Permitted Small Flows Discharges Municipal Discharges/Sewage color.gif 676.0
Crop Production (Crop Land Or Dry Land) Agriculture color.gif 550.0
Introduction Of Non-Native Organisms (Accidental Or Intentional) Other color.gif 530.0
Sewage Discharges In Unsewered Areas Municipal Discharges/Sewage color.gif 326.0
Accidental Release/Spill Spills/Dumping color.gif 319.0
Wildlife Other Than Waterfowl Natural/Wildlife color.gif 315.0
Runoff From Forest/Grassland/Parkland Other color.gif 311.0
Managed Pasture Grazing Agriculture color.gif 294.0
Site Clearance (Land Development Or Redevelopment) Construction color.gif 293.6
Drainage/Filling/Loss Of Wetlands Habitat Alterations (Not Directly Related To Hydromodification) color.gif 291.6
Rural (Residential Areas) Other color.gif 291.0
Sanitary Sewer Overflows (Collection System Failures) Municipal Discharges/Sewage color.gif 271.0
Industrial Point Source Discharge Industrial color.gif 213.0
Naturally Occurring Organic Acids Natural/Wildlife color.gif 207.0
Unpermitted Discharge (Domestic Wastes) Municipal Discharges/Sewage color.gif 204.0
Sources Outside State Jurisdiction Or Borders Other color.gif 199.0
Sediment Resuspension (Clean Sediment) Hydromodification color.gif 199.0
Rangeland Grazing Agriculture color.gif 176.0
Flow Alterations From Water Diversions Hydromodification color.gif 160.0
Silviculture Plantation Management Silviculture (Forestry) color.gif 140.0
Silviculture Activities Silviculture (Forestry) color.gif 127.0
Marina/Boating Sanitary On-Vessel Discharges Recreational Boating And Marinas color.gif 117.0
Impacts From Hydrostructure Flow Regulation/Modification Hydromodification color.gif 110.0
Silviculture Harvesting Silviculture (Forestry) color.gif 100.0
Municipal (Urbanized High Density Area) Urban-Related Runoff/Stormwater color.gif 100.0
Residential Districts Urban-Related Runoff/Stormwater color.gif 86.0
Discharges From Municipal Separate Storm Sewer Systems (Ms4) Urban-Related Runoff/Stormwater color.gif 86.0
Total Retention Domestic Sewage Lagoons Municipal Discharges/Sewage color.gif 78.0
Waterfowl Natural/Wildlife color.gif 63.0
Petroleum/Natural Gas Activities Resource Extraction color.gif 60.5
Forced Drainage Pumping Hydromodification color.gif 59.0
Combined Sewer Overflows Municipal Discharges/Sewage color.gif 56.0
Upstream Source Other color.gif 55.0
Changes In Tidal Circulation/Flushing Hydromodification color.gif 43.0
Dredging (E.G., For Navigation Channels) Hydromodification color.gif 40.0
Littoral/Shore Area Modifications (Non-Riverine) Habitat Alterations (Not Directly Related To Hydromodification) color.gif 39.0
Habitat Modification - Other Than Hydromodification Habitat Alterations (Not Directly Related To Hydromodification) color.gif 39.0
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 31.0
Unspecified Domestic Waste Municipal Discharges/Sewage color.gif 28.0
Contaminated Sediments Legacy/Historical Pollutants color.gif 20.3
Cercla Npl (Superfund) Sites Legacy/Historical Pollutants color.gif 13.0
Manure Runoff Agriculture color.gif 12.0
Dairies (Outside Milk Parlor Areas) Agriculture color.gif 10.0
Unspecified Urban Stormwater Urban-Related Runoff/Stormwater color.gif 8.0
Seafood Processing Operations Aquaculture color.gif 7.0

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Site-specific Targeted Monitoring Results

Louisiana Lakes, Reservoirs, and Ponds 2012

Description of this table

All
Lakes, Reservoirs, and Ponds

1,078,031.0 Acres of Lakes, Reservoirs, and Ponds

Assessed 668,847.0
Unassessed 409,184.0
Total Acres 1,078,031.0







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Description of this table

Assessed
Lakes, Reservoirs, and Ponds

668,847.0 Acres of
Assessed Lakes, Reservoirs, and Ponds

Good 39,176.0
Threatened .0
Impaired 629,671.0
Total Acres Assessed 668,847.0







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Description of this table

Threatened and Impaired
Lakes, Reservoirs, and Ponds

629,671.0 Acres of
Threatened and Impaired
Lakes, Reservoirs, and Ponds

317,013.0
21,888.0
.0
290,770.0
Total Threatened and Impaired 629,671.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Louisiana Lakes, Reservoirs, and Ponds 2012

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
% Good
% Threatened
% Impaired
Agriculture 425,672.0 100.0 .0 .0 color.gif
Drinking Water Supply 262,376.0 99.0 .0 1.0 color.gifcolor.gif
Fish And Wildlife Propagation 668,823.0 5.9 .0 94.1 color.gifcolor.gif
Primary Contact Recreation 655,888.0 99.7 .0 .3 color.gifcolor.gif
Secondary Contact Recreation 655,888.0 98.6 .0 1.4 color.gifcolor.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Louisiana Lakes, Reservoirs, and Ponds 2012

Description of this table
Mercury in Fish Tissue Mercury color.gif 331,440.0
Non-Native Aquatic Plants Nuisance Exotic Species color.gif 319,163.0
Turbidity Turbidity color.gif 255,645.0
Total Suspended Solids (TSS) Turbidity color.gif 154,717.0
Sedimentation/Siltation Sediment color.gif 153,472.0
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 88,504.0
Carbofuran Pesticides color.gif 83,840.0
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 69,175.0
Total Dissolved Solids (TDS) Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 56,638.0
Chloride Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 51,840.0
pH, High pH/Acidity/Caustic Conditions color.gif 30,630.0
Phosphorus, Total Nutrients color.gif 12,899.0
Nitrate/Nitrite (Nitrite + Nitrate as N) Nutrients color.gif 12,875.0
pH, Low pH/Acidity/Caustic Conditions color.gif 10,623.0
Fecal Coliform Pathogens color.gif 10,611.0
Color Taste, Color and Odor color.gif 2,690.0
Polychlorinated Biphenyls (PCBs) Polychlorinated Biphenyls (PCBs) color.gif 2,260.0
Temperature, Water Temperature color.gif 1,383.0
Oil and Grease Oil and Grease color.gif 24.0
Arsenic Metals (other than Mercury) color.gif 24.0
Lead Metals (other than Mercury) color.gif 24.0
Hexachlorobutadiene Toxic Organics color.gif 24.0
Hexachlorobenzene Pesticides color.gif 24.0

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Site-specific Targeted Monitoring Results

Probable Sources
Louisiana Lakes, Reservoirs, and Ponds 2012

Description of this table
Source Unknown Unknown color.gif 370,219.0
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 331,416.0
Introduction Of Non-Native Organisms (Accidental Or Intentional) Other color.gif 319,163.0
Natural Conditions - Water Quality Standards Use Attainability Analyses Needed Natural/Wildlife color.gif 103,535.0
Non-Irrigated Crop Production Agriculture color.gif 101,460.0
Irrigated Crop Production Agriculture color.gif 84,048.0
Natural Sources Natural/Wildlife color.gif 81,558.0
Sediment Resuspension (Clean Sediment) Hydromodification color.gif 66,778.0
Agriculture Agriculture color.gif 33,348.0
Naturally Occurring Organic Acids Natural/Wildlife color.gif 24,703.0
Site Clearance (Land Development Or Redevelopment) Construction color.gif 10,995.0
Waterfowl Natural/Wildlife color.gif 10,842.0
Package Plant Or Other Permitted Small Flows Discharges Municipal Discharges/Sewage color.gif 10,349.0
Lake Fertilization Other color.gif 10,272.0
Sanitary Sewer Overflows (Collection System Failures) Municipal Discharges/Sewage color.gif 9,248.0
Runoff From Forest/Grassland/Parkland Other color.gif 7,104.0
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 7,104.0
Rural (Residential Areas) Other color.gif 5,418.0
Sewage Discharges In Unsewered Areas Municipal Discharges/Sewage color.gif 5,226.0
Other Spill Related Impacts Spills/Dumping color.gif 2,598.0
Unspecified Land Disturbance Other color.gif 2,598.0
Industrial Point Source Discharge Industrial color.gif 2,200.0
Streambank Modifications/Destabilization Hydromodification color.gif 1,747.0
Silviculture Activities Silviculture (Forestry) color.gif 1,747.0
Silviculture Plantation Management Silviculture (Forestry) color.gif 1,747.0
Internal Nutrient Recycling Natural/Wildlife color.gif 1,594.0
Impacts From Hydrostructure Flow Regulation/Modification Hydromodification color.gif 1,581.0
Drought-Related Impacts Natural/Wildlife color.gif 1,383.0
Industrial/Commercial Site Stormwater Discharge (Permitted) Urban-Related Runoff/Stormwater color.gif 84.0
Discharges From Municipal Separate Storm Sewer Systems (Ms4) Urban-Related Runoff/Stormwater color.gif 60.0
Urban Runoff/Storm Sewers Urban-Related Runoff/Stormwater color.gif 24.0
Contaminated Sediments Legacy/Historical Pollutants color.gif 24.0

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Site-specific Targeted Monitoring Results

Louisiana Bays and Estuaries 2012

Description of this table

All
Bays and Estuaries

7,656.0 Square Miles of Bays and Estuaries

Assessed 4,953.5
Unassessed 2,702.5
Total Square Miles 7,656.0







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Description of this table

Assessed
Bays and Estuaries

4,953.5 Square Miles of
Assessed Bays and Estuaries

Good 813.5
Threatened .0
Impaired 4,140.0
Total Square Miles Assessed 4,953.5







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Description of this table

Threatened and Impaired
Bays and Estuaries

4,140.0 Square Miles of
Threatened and Impaired
Bays and Estuaries

328.0
1,996.0
.0
1,816.0
Total Threatened and Impaired 4,140.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Louisiana Bays and Estuaries 2012

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
% Good
% Threatened
% Impaired
Fish And Wildlife Propagation 4,953.5 24.5 .0 75.5 color.gifcolor.gif
Oyster Propagation 4,268.0 11.9 .0 88.1 color.gifcolor.gif
Primary Contact Recreation 4,953.5 45.6 .0 54.4 color.gifcolor.gif
Secondary Contact Recreation 4,953.5 97.5 .0 2.5 color.gifcolor.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Louisiana Bays and Estuaries 2012

Description of this table
Foam/Flocs/Scum/Oil Slicks Other Cause color.gif 2,854.0
Fish Advisory - No Restriction Fish Consumption Advisory color.gif 2,854.0
Other Cause Other Cause color.gif 2,854.0
Mercury in Fish Tissue Mercury color.gif 1,657.0
Fecal Coliform Pathogens color.gif 1,375.0
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 665.0
Turbidity Turbidity color.gif 212.0
Carbofuran Pesticides color.gif 187.0
Sedimentation/Siltation Sediment color.gif 187.0
Total Suspended Solids (TSS) Turbidity color.gif 187.0
Non-Native Aquatic Plants Nuisance Exotic Species color.gif 91.0
Chloride Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 6.0
Sulfates Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 6.0
Total Dissolved Solids (TDS) Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 6.0

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Site-specific Targeted Monitoring Results

Probable Sources
Louisiana Bays and Estuaries 2012

Description of this table
Accidental Release/Spill Spills/Dumping color.gif 2,854.0
Source Unknown Unknown color.gif 1,682.0
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 1,657.0
Package Plant Or Other Permitted Small Flows Discharges Municipal Discharges/Sewage color.gif 701.0
Upstream Source Other color.gif 663.0
Natural Sources Natural/Wildlife color.gif 608.0
Petroleum/Natural Gas Production Activities (Permitted) Industrial color.gif 581.0
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 519.0
Marina/Boating Sanitary On-Vessel Discharges Recreational Boating And Marinas color.gif 264.0
Petroleum/Natural Gas Activities Resource Extraction color.gif 200.0
Non-Irrigated Crop Production Agriculture color.gif 187.0
Irrigated Crop Production Agriculture color.gif 187.0
Introduction Of Non-Native Organisms (Accidental Or Intentional) Other color.gif 91.0
Wildlife Other Than Waterfowl Natural/Wildlife color.gif 64.0
Sediment Resuspension (Clean Sediment) Hydromodification color.gif 25.0
Drought-Related Impacts Natural/Wildlife color.gif 8.0
Agriculture Agriculture color.gif 6.0
Sanitary Sewer Overflows (Collection System Failures) Municipal Discharges/Sewage color.gif 2.0
Waterfowl Natural/Wildlife color.gif 2.0
Discharges From Municipal Separate Storm Sewer Systems (Ms4) Urban-Related Runoff/Stormwater color.gif 2.0

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Site-specific Targeted Monitoring Results

Louisiana Wetlands 2012

Description of this table

All
Wetlands

7,784,200.0 Acres of Wetlands

Assessed 1,025,280.0
Unassessed 6,758,920.0
Total Acres 7,784,200.0







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Description of this table

Assessed
Wetlands

1,025,280.0 Acres of
Assessed Wetlands

Good 558,080.0
Threatened .0
Impaired 467,200.0
Total Acres Assessed 1,025,280.0







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Description of this table

Threatened and Impaired
Wetlands

467,200.0 Acres of
Threatened and Impaired
Wetlands

199,040.0
.0
.0
268,160.0
Total Threatened and Impaired 467,200.0

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Site-specific Targeted Monitoring Results

Individual Designated Use Support
Louisiana Wetlands 2012

* Waters assessed for more than one designated use are included in multiple designated use groups below.

Description of this table
% Good
% Threatened
% Impaired
Drinking Water Supply 464,000.0 100.0 .0 .0 color.gif
Fish And Wildlife Propagation 1,017,600.0 61.2 .0 38.8 color.gifcolor.gif
Oyster Propagation 72,320.0 .0 .0 100.0 color.gif
Primary Contact Recreation 1,017,600.0 92.9 .0 7.1 color.gifcolor.gif
Secondary Contact Recreation 1,025,280.0 100.0 .0 .0 color.gif

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Site-specific Targeted Monitoring Results

Causes of Impairment
Louisiana Wetlands 2012

Description of this table
Dissolved Oxygen Organic Enrichment/Oxygen Depletion color.gif 394,880.0
Mercury in Fish Tissue Mercury color.gif 199,040.0
Fecal Coliform Pathogens color.gif 72,320.0

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Site-specific Targeted Monitoring Results

Probable Sources
Louisiana Wetlands 2012

Description of this table
Source Unknown Unknown color.gif 271,360.0
Atmospheric Deposition - Toxics Atmospheric Deposition color.gif 199,040.0
Petroleum/Natural Gas Production Activities (Permitted) Industrial color.gif 195,840.0
Non-Irrigated Crop Production Agriculture color.gif 195,840.0
On-Site Treatment Systems (Septic Systems And Similar Decentralized Systems) Municipal Discharges/Sewage color.gif 72,320.0
Marina/Boating Sanitary On-Vessel Discharges Recreational Boating And Marinas color.gif 72,320.0

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Louisiana Causes of Impairment for Reporting Year 2012


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.
Size of Assessed Waters with Listed Causes of Impairment
Dioxins 87.0
Fish Consumption Advisory 319.0 2,854.0
Mercury 2,526.0 331,440.0 1,657.0 199,040.0
Metals (other than Mercury) 524.0 24.0
Nuisance Exotic Species 530.0 319,163.0 91.0
Nutrients 1,243.0 12,899.0
Oil and Grease 4.0 24.0
Organic Enrichment/Oxygen Depletion 4,535.9 88,504.0 665.0 394,880.0
Other Cause 319.0 2,854.0
Pathogens 2,405.0 10,611.0 1,375.0 72,320.0
Pesticides 1,355.3 83,864.0 187.0
pH/Acidity/Caustic Conditions 218.0 41,253.0
Polychlorinated Biphenyls (PCBs) 41.0 2,260.0
Salinity/Total Dissolved Solids/Chlorides/Sulfates 1,462.5 71,797.0 6.0
Sediment 1,089.0 153,472.0 187.0
Taste, Color and Odor 153.0 2,690.0
Temperature 141.0 1,383.0
Toxic Organics 61.3 24.0
Turbidity 2,306.6 255,693.0 212.0

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Louisiana Probable Sources Contributing to Impairments
for Reporting Year 2012

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.
Size of Assessed Waters with Probable Sources of Impairments
Agriculture 2,889.9 134,808.0 193.0 195,840.0
Aquaculture 7.0
Atmospheric Deposition 2,526.0 331,416.0 1,657.0 199,040.0
Construction 293.6 10,995.0
Habitat Alterations (Not Directly Related To Hydromodification) 291.6
Hydromodification 523.0 70,106.0 25.0
Industrial 213.0 2,200.0 581.0 195,840.0
Legacy/Historical Pollutants 20.3 24.0
Municipal Discharges/Sewage 2,434.0 21,578.0 1,102.0 72,320.0
Natural/Wildlife 2,905.0 184,502.0 678.0
Other 1,160.0 327,179.0 754.0
Recreational Boating And Marinas 117.0 264.0 72,320.0
Resource Extraction 60.5 200.0
Silviculture (Forestry) 359.0 1,747.0
Spills/Dumping 319.0 2,598.0 2,854.0
Unknown 3,834.6 370,219.0 1,682.0 271,360.0
Urban-Related Runoff/Stormwater 297.0 84.0 2.0

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Louisiana TMDL Alternatives by Cause of Impairment 2012


Description of this table


NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment.
Fish Advisory - No Restriction color.gif 42 319   2,854
Foam/Flocs/Scum/Oil Slicks color.gif 42 319   2,854
Other Cause color.gif 42 319   2,854
Non-Native Aquatic Plants color.gif 40 499 311,438 91
Polychlorinated Biphenyls (PCBs) color.gif 3   2,260  
Benzo[a]pyrene (PAHs) color.gif 2 13    
1,1,2-Trichloroethane color.gif 1 7    
1,2-Dichloroethane color.gif 1 7    
Arsenic color.gif 1   24  
Chloroform color.gif 1 7    
Hexachlorobenzene color.gif 1   24  
Hexachlorobutadiene color.gif 1   24  
Lead color.gif 1   24  
Mercury in Fish Tissue color.gif 1   24  
Oil and Grease color.gif 1 4    

Total: 180 TMDL Alternatives

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Louisiana 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.
2005 color.gif 17 23
2011 color.gif 51 65

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Louisiana 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.
Salinity/Total Dissolved Solids/Chlorides/Sulfates color.gif 82
Pathogens color.gif 81
Organic Enrichment/Oxygen Depletion color.gif 80
Mercury color.gif 35
Turbidity color.gif 30
pH/Acidity/Caustic Conditions color.gif 15
Metals (other than Mercury) color.gif 14
Temperature color.gif 10
Nutrients color.gif 7
Taste, Color and Odor color.gif 5

Total: 359 Causes of Impairment

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

Total: 750 TMDLs; 751 Causes of Impairment Addressed


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Louisiana 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.
1998 color.gif 2 2
2000 color.gif