Louisiana Water Quality Assessment Report | WATERS

Louisiana 2006 Water Quality Assessment Report

Assessed Waters of Louisiana by Watershed

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NOTE: The data provided in this report may differ from the information provided in the original Louisiana 2006 Water Quality Integrated Report. This is a result of differences between the Louisiana State assessment database and the summary data provided in Louisiana's 2006 Integrated Report, which is available at http://www.deq.louisiana.gov/portal/tabid/98/Default.aspx.

	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)	Bays and Estuaries (Square Miles)	Wetlands (Acres)
	Size of Water
Good Waters	2,136.2	82,529.0	2,563.5	629,760.0
Previously impaired waters now attaining all uses			252.0
Threatened Waters
TMDL completed
TMDL alternative
Non-pollutant impairment
TMDL needed
Impaired Waters	7,365.2	582,659.0	2,390.0	402,560.0
TMDL completed	1,803.4	89,909.0	864.0
TMDL alternative	43.3	2,912.0
Non-pollutant impairment
TMDL needed	5,518.5	489,838.0	1,526.0	402,560.0
New TMDLs completed	1.8	.0	.0	.0
Remaining TMDLs needed	5,516.7	489,838.0	1,526.0	402,560.0

Total Assessed Waters	9,501.4	665,188.0	4,953.5	1,032,320.0
Total Waters	66,294.0	1,078,031.0	7,656.0	7,784,200.0
Percent of Waters Assessed	14.3	61.7	64.7	13.3

Designated Use	Miles Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Agriculture	2,007.0	100.0	.0	.0
Drinking Water Supply	1,311.0	64.9	.0	35.1
Fish And Wildlife Propagation	9,341.0	31.5	.0	68.5
Limited Aquatic Life And Wildlife Use	82.1	23.4	.0	76.6
Outstanding Natural Resource Waters	1,532.0	65.3	.0	34.7
Oyster Propagation	470.0	32.8	.0	67.2
Primary Contact Recreation	9,197.8	72.4	.0	27.6
Secondary Contact Recreation	9,323.6	95.6	.0	4.4

Cause of Impairment	Cause of Impairment Group	Miles Threatened or Impaired
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	3,262.9
Fecal Coliform	Pathogens	2,840.0
Mercury	Mercury	2,396.5
Turbidity	Turbidity	2,270.0
Total Suspended Solids (TSS)	Turbidity	1,950.0
Nitrate/Nitrite (Nitrite + Nitrate as N)	Nutrients	1,589.0
Phosphorus, Total	Nutrients	1,525.0
Sedimentation/Siltation	Sediment	1,274.0
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	1,183.5
Carbofuran	Pesticides	930.0
DDT	Pesticides	749.0
Sulfates	Salinity/Total Dissolved Solids/Chlorides/Sulfates	677.0
Non-Native Aquatic Plants	Nuisance Exotic Species	498.0
Chloride	Salinity/Total Dissolved Solids/Chlorides/Sulfates	468.5
Color	Taste, Color and Odor	460.0
Toxaphene	Pesticides	420.0
pH, Low	pH/Acidity/Caustic Conditions	361.0
Ammonia, Total	Ammonia	220.0
Fipronil	Pesticides	215.0
Lead	Metals (other than Mercury)	207.0
Atrazine	Pesticides	103.0
Dioxin (Including 2,3,7,8-TCDD)	Dioxins	87.0
Nitrogen, Total	Nutrients	64.0
Copper	Metals (other than Mercury)	50.0
Methyl Parathion	Pesticides	43.0
Polychlorinated Biphenyls (PCBs)	Polychlorinated Biphenyls (PCBs)	41.0
Polycyclic Aromatic Hydrocarbons (PAHs) (Aquatic Ecosystems)	Toxic Organics	29.0
1,2-Dichloroethane	Pesticides	15.3
Benzo[a]pyrene (PAHs)	Toxic Organics	13.0
1,1,1,2-Tetrachloroethane	Toxic Organics	12.0
Hexachlorobenzene	Pesticides	12.0
Bromoform	Toxic Organics	12.0
Hexachlorobutadiene	Toxic Organics	12.0
Methoxychlor	Pesticides	8.0
Phenols	Toxic Organics	8.0
Chloroform	Toxic Organics	7.3
1,1,2-Trichloroethane	Toxic Organics	7.3
pH, High	pH/Acidity/Caustic Conditions	7.0
Chlorine	Chlorine	6.0
Oil and Grease	Oil and Grease	4.0

Probable Source	Probable Source Group	Miles Threatened or Impaired
Source Unknown	Unknown	3,639.5
Atmospheric Deposition - Toxics	Atmospheric Deposition	2,396.5
Irrigated Crop Production	Agriculture	2,079.0
Non-Irrigated Crop Production	Agriculture	1,820.0
Natural Conditions - Water Quality Standards Use Attainability Analyses Needed	Natural/Wildlife	1,388.0
On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems)	Municipal Dishcarges/Sewage	1,306.0
Natural Sources	Natural/Wildlife	983.0
Municipal Point Source Discharges	Municipal Dishcarges/Sewage	780.0
Introduction Of Non-Native Organisms (Accidental Or Intentional)	Other	498.0
Sources Outside State Juristiction Or Borders	Other	480.0
Wildlife Other Than Waterfowl	Natural/Wildlife	437.0
Package Plant Or Other Permitted Small Flows Discharges	Municipal Dishcarges/Sewage	408.0
Upstream Source	Other	382.0
Naturally Occurring Organic Acids	Natural/Wildlife	361.0
Drought-Related Impacts	Natural/Wildlife	352.0
Sanitary Sewer Overflows (Collection System Failures)	Municipal Dishcarges/Sewage	314.0
Managed Pasture Grazing	Agriculture	261.0
Industrial Point Source Discharge	Industrial	234.3
Sewage Discharges In Unsewered Areas	Municipal Dishcarges/Sewage	223.0
Flow Alterations From Water Diversions	Hydromodification	211.0
Municipal (Urbanized High Density Area)	Urban-Related Runoff/Stormwater	156.0
Discharges From Municipal Separate Storm Sewer Systems (Ms4)	Urban-Related Runoff/Stormwater	154.0
Silviculture Plantation Management	Silviculture (Forestry)	147.0
Impacts From Hydrostructure Flow Regulation/Modification	Hydromodification	131.0
Drainage/Filling/Loss Of Wetlands	Habitat Alterations (Not Directly Related To Hydromodification)	129.0
Silviculture Harvesting	Silviculture (Forestry)	121.0
Unpermitted Discharge (Domestic Wastes)	Municipal Dishcarges/Sewage	120.0
Petroleum/Natural Gas Activities	Resource Extraction	117.5
Changes In Tidal Circulation/Flushing	Hydromodification	112.0
Sediment Resuspension (Clean Sediment)	Hydromodification	91.0
Livestock (Grazing Or Feeding Operations)	Agriculture	89.0
Total Retention Domestic Sewage Lagoons	Municipal Dishcarges/Sewage	86.0
Residential Districts	Urban-Related Runoff/Stormwater	86.0
Marina/Boating Sanitary On-Vessel Discharges	Recreational Boating And Marinas	79.0
Waterfowl	Natural/Wildlife	77.0
Forced Drainage Pumping	Hydromodification	71.0
Dairies (Outside Milk Parlor Areas)	Agriculture	66.0
Site Clearance (Land Development Or Redevelopment)	Construction	61.0
Agriculture	Agriculture	57.9
Sand/Gravel/Rock Mining Or Quarries	Resource Extraction	30.0
Mine Tailings	Resource Extraction	30.0
Silviculture Activities	Silviculture (Forestry)	17.0
Contaminated Sediments	Legacy/Historical Pollutants	13.0
Cercla Npl (Superfund) Sites	Legacy/Historical Pollutants	13.0
Streambank Modifications/Destablization	Hydromodification	10.0

Designated Use	Acres Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Agriculture	425,672.0	100.0	.0	.0
Drinking Water Supply	251,717.0	98.9	.0	1.1
Fish And Wildlife Propagation	665,188.0	12.8	.0	87.2
Primary Contact Recreation	656,029.0	95.4	.0	4.6
Secondary Contact Recreation	656,029.0	95.9	.0	4.1

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Non-Native Aquatic Plants	Nuisance Exotic Species	319,163.0
Mercury	Mercury	275,002.0
Turbidity	Turbidity	253,053.0
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	174,612.0
Total Suspended Solids (TSS)	Turbidity	156,343.0
Sedimentation/Siltation	Sediment	155,098.0
Phosphorus, Total	Nutrients	124,931.0
Nitrate/Nitrite (Nitrite + Nitrate as N)	Nutrients	124,931.0
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	114,195.0
Chloride	Salinity/Total Dissolved Solids/Chlorides/Sulfates	112,019.0
Ammonia, Total	Ammonia	89,939.0
Carbofuran	Pesticides	83,840.0
Sulfates	Salinity/Total Dissolved Solids/Chlorides/Sulfates	62,355.0
Fecal Coliform	Pathogens	27,972.0
Oil and Grease	Oil and Grease	26,904.0
pH, High	pH/Acidity/Caustic Conditions	15,680.0
pH, Low	pH/Acidity/Caustic Conditions	3,846.0
Color	Taste, Color and Odor	2,690.0
Polychlorinated Biphenyls (PCBs)	Polychlorinated Biphenyls (PCBs)	2,260.0
Temperature, Water	Temperature	2,250.0
Lead	Metals (other than Mercury)	1,771.0
Hexachlorobenzene	Pesticides	24.0
Hexachlorobutadiene	Toxic Organics	24.0

Designated Use	Square Miles Assessed	Percent Good	Percent Threatened	Percent Impaired	% Good
					% Threatened
					% Impaired
Fish And Wildlife Propagation	4,953.5	62.5	.0	37.5
Oyster Propagation	4,268.0	66.4	.0	33.6
Primary Contact Recreation	4,953.5	98.2	.0	1.8
Secondary Contact Recreation	4,953.5	100.0	.0	.0

Cause of Impairment	Cause of Impairment Group	Square Miles Threatened or Impaired
Mercury	Mercury	1,657.0
Fecal Coliform	Pathogens	1,524.0
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	299.0
Nitrate/Nitrite (Nitrite + Nitrate as N)	Nutrients	297.0
Phosphorus, Total	Nutrients	297.0
Sedimentation/Siltation	Sediment	193.0
Turbidity	Turbidity	193.0
Total Suspended Solids (TSS)	Turbidity	193.0
Carbofuran	Pesticides	187.0
Non-Native Aquatic Plants	Nuisance Exotic Species	91.0
Ammonia, Total	Ammonia	6.0

Probable Source	Probable Source Group	Square Miles Threatened or Impaired
Source Unknown	Unknown	2,086.0
Atmospheric Deposition - Toxics	Atmospheric Deposition	1,657.0
Package Plant Or Other Permitted Small Flows Discharges	Municipal Dishcarges/Sewage	588.0
Petroleum/Natural Gas Production Activities (Permitted)	Industrial	581.0
Natural Sources	Natural/Wildlife	581.0
Sources Outside State Juristiction Or Borders	Other	200.0
Municipal Point Source Discharges	Municipal Dishcarges/Sewage	200.0
Non-Irrigated Crop Production	Agriculture	193.0
Irrigated Crop Production	Agriculture	193.0
Introduction Of Non-Native Organisms (Accidental Or Intentional)	Other	91.0
Sewage Discharges In Unsewered Areas	Municipal Dishcarges/Sewage	72.0
Unpermitted Discharge (Domestic Wastes)	Municipal Dishcarges/Sewage	67.0
Marina/Boating Sanitary On-Vessel Discharges	Recreational Boating And Marinas	60.0
Wildlife Other Than Waterfowl	Natural/Wildlife	56.0
Upstream Source	Other	44.0
Waterfowl	Natural/Wildlife	25.0
On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems)	Municipal Dishcarges/Sewage	7.0
Total Retention Domestic Sewage Lagoons	Municipal Dishcarges/Sewage	7.0
Sanitary Sewer Overflows (Collection System Failures)	Municipal Dishcarges/Sewage	2.0
Natural Conditions - Water Quality Standards Use Attainability Analyses Needed	Natural/Wildlife	2.0
Discharges From Municipal Separate Storm Sewer Systems (Ms4)	Urban-Related Runoff/Stormwater	2.0

Cause of Impairment	Cause of Impairment Group	Acres Threatened or Impaired
Mercury	Mercury	394,880.0
Dissolved Oxygen	Organic Enrichment/Oxygen Depletion	195,840.0
Total Dissolved Solids (TDS)	Salinity/Total Dissolved Solids/Chlorides/Sulfates	7,680.0
Chloride	Salinity/Total Dissolved Solids/Chlorides/Sulfates	7,680.0
Sulfates	Salinity/Total Dissolved Solids/Chlorides/Sulfates	7,680.0

Cycle 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 waters now attaining all uses.
2005	17	23

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

Cause of Impairment Group	Size of Assessed Waters with Listed Causes of Impairment
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.
Cause of Impairment Group	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)	Bays and Estuaries (Square Miles)	Wetlands (Acres)
Ammonia	220.0	89,939.0	6.0
Chlorine	6.0
Dioxins	87.0
Mercury	2,396.5	275,002.0	1,657.0	394,880.0
Metals (other than Mercury)	257.0	1,771.0
Nuisance Exotic Species	498.0	319,163.0	91.0
Nutrients	1,589.0	124,931.0	297.0
Oil and Grease	4.0	26,904.0
Organic Enrichment/Oxygen Depletion	3,262.9	174,612.0	299.0	195,840.0
Pathogens	2,840.0	27,972.0	1,524.0
Pesticides	1,378.3	83,864.0	187.0
pH/Acidity/Caustic Conditions	368.0	19,526.0
Polychlorinated Biphenyls (PCBs)	41.0	2,260.0
Salinity/Total Dissolved Solids/Chlorides/Sulfates	1,653.5	114,195.0		7,680.0
Sediment	1,274.0	155,098.0	193.0
Taste, Color and Odor	460.0	2,690.0
Temperature		2,250.0
Toxic Organics	61.3	24.0
Turbidity	2,412.0	254,061.0	193.0

Probable Source Group	Size of Assessed Waters with Probable Sources of Impairments
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	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)	Bays and Estuaries (Square Miles)	Wetlands (Acres)
Agriculture	2,709.9	148,017.0	193.0	195,840.0
Atmospheric Deposition	2,396.5	275,002.0	1,657.0	394,880.0
Construction	61.0
Habitat Alterations (Not Directly Related To Hydromodification)	129.0
Hydromodification	593.0	46,912.0
Industrial	234.3	29,080.0	581.0	195,840.0
Legacy/Historical Pollutants	13.0	24.0
Municipal Dishcarges/Sewage	2,330.0	3,096.0	862.0
Natural/Wildlife	2,957.0	218,222.0	664.0	7,680.0
Other	1,075.0	319,187.0	335.0
Recreational Boating And Marinas	79.0		60.0
Resource Extraction	177.5
Silviculture (Forestry)	285.0
Unknown	3,639.5	316,277.0	2,086.0	394,880.0
Urban-Related Runoff/Stormwater	396.0	84.0	2.0

Cause of Impairment	Number of TMDL Alternatives	Rivers and Streams (Miles)	Lakes, Reservoirs, and Ponds (Acres)	Bays and Estuaries (Square Miles)
NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment.
Non-Native Aquatic Plants	41	492	311,438	91
Polychlorinated Biphenyls (PCBs)	2		84
1,1,2-Trichloroethane	1	7
1,2-Dichloroethane	1	7
Chloroform	1	7
Hexachlorobenzene	1		24
Hexachlorobutadiene	1		24
Oil and Grease	1		24

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	110
Pathogens	106
Mercury	74
Salinity/Total Dissolved Solids/Chlorides/Sulfates	71
Nutrients	58
Turbidity	27
pH/Acidity/Caustic Conditions	13
Metals (other than Mercury)	9
Taste, Color and Odor	4
Ammonia	3
Sediment	2
Chlorine	1
Oil and Grease	1

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.
Oxygen Demand	96	96
Fecal Coliform	70	70
Total Suspended Solids (TSS)	64	64
Nutrients Oxygen Demand	41	41
Phosphorus, Total	41	41
Dissolved Oxygen	33	33
Turbidity	32	32
Mercury in Fish Tissue	31	31
Carbofuran	26	26
Total Dissolved Solids (TDS)	26	26
Nutrients	21	21
Mercury	18	18
Nitrogen, Total	16	16
Siltation	15	15
Nitrogen	14	14
Biochemical Oxygen Demand (BOD)	11	11
Lead	10	10
Sulfates	10	10
Organic Enrichment/Low Dissolved Oxygen	7	7
Ammonia	6	6
Chlorides	6	6
Copper	6	6
Fipronil	6	6
DDT	5	5
Ammonia Nitrogen	4	4
Chloride	4	4
Phosphorus	4	4
Sulfate	4	4
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
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

Louisiana 2006 Water Quality Assessment Report

Frequent Questions

Louisiana Assessment Summary for Reporting Year 2006

Summary of Water Quality Assessments for Each Waterbody Typefor Reporting Year 2006

Louisiana Assessed WatersSummary of Water Quality Attainment for Rivers and StreamsReporting Year 2006

Louisiana Assessed WatersDesignated Use Support for Rivers and StreamsReporting Year 2006*

Louisiana Causes of Impairmentfor Threatened and Impaired Rivers and StreamsReporting Year 2006

Louisiana Probable Sources of Impairmentsfor Threatened and Impaired Rivers and StreamsReporting Year 2006

Louisiana Assessed WatersSummary of Water Quality Attainment for Lakes, Reservoirs, and PondsReporting Year 2006

Louisiana Assessed WatersDesignated Use Support for Lakes, Reservoirs, and PondsReporting Year 2006*

Louisiana Causes of Impairmentfor Threatened and Impaired Lakes, Reservoirs, and PondsReporting Year 2006

Louisiana Probable Sources of Impairmentsfor Threatened and Impaired Lakes, Reservoirs, and PondsReporting Year 2006

Louisiana Assessed WatersSummary of Water Quality Attainment for Bays and EstuariesReporting Year 2006

Louisiana Assessed WatersDesignated Use Support for Bays and EstuariesReporting Year 2006*

Louisiana Causes of Impairmentfor Threatened and Impaired Bays and EstuariesReporting Year 2006

Louisiana Probable Sources of Impairmentsfor Threatened and Impaired Bays and EstuariesReporting Year 2006

Louisiana Assessed WatersSummary of Water Quality Attainment for WetlandsReporting Year 2006

Louisiana Assessed WatersDesignated Use Support for WetlandsReporting Year 2006*

Louisiana Causes of Impairmentfor Threatened and Impaired WetlandsReporting Year 2006

Louisiana Probable Sources of Impairmentsfor Threatened and Impaired WetlandsReporting Year 2006

Louisiana Causes of Impairment for Reporting Year 2006

Louisiana Probable Sources Contributing to Impairmentsfor Reporting Year 2006

Louisiana TMDL Alternatives by Cause of Impairment 2006

Louisiana Previously Impaired Waters Now Attaining All Uses

Louisiana Causes of Impairment for 303(d) Listed Waters

Louisiana Cumulative TMDLs by Pollutant

Louisiana Cumulative Number of TMDLs

TMDL Document Search

Summary of Water Quality Assessments for Each Waterbody Type
for Reporting Year 2006

Louisiana Assessed Waters
Summary of Water Quality Attainment for Rivers and Streams
Reporting Year 2006

Louisiana Assessed Waters
Designated Use Support for Rivers and Streams
Reporting Year 2006*

Louisiana Causes of Impairment
for Threatened and Impaired Rivers and Streams
Reporting Year 2006

Louisiana Probable Sources of Impairments
for Threatened and Impaired Rivers and Streams
Reporting Year 2006

Louisiana Assessed Waters
Summary of Water Quality Attainment for Lakes, Reservoirs, and Ponds
Reporting Year 2006

Louisiana Assessed Waters
Designated Use Support for Lakes, Reservoirs, and Ponds
Reporting Year 2006*

Louisiana Causes of Impairment
for Threatened and Impaired Lakes, Reservoirs, and Ponds
Reporting Year 2006

Louisiana Probable Sources of Impairments
for Threatened and Impaired Lakes, Reservoirs, and Ponds
Reporting Year 2006

Louisiana Assessed Waters
Summary of Water Quality Attainment for Bays and Estuaries
Reporting Year 2006

Louisiana Assessed Waters
Designated Use Support for Bays and Estuaries
Reporting Year 2006*

Louisiana Causes of Impairment
for Threatened and Impaired Bays and Estuaries
Reporting Year 2006

Louisiana Probable Sources of Impairments
for Threatened and Impaired Bays and Estuaries
Reporting Year 2006

Louisiana Assessed Waters
Summary of Water Quality Attainment for Wetlands
Reporting Year 2006

Louisiana Assessed Waters
Designated Use Support for Wetlands
Reporting Year 2006*

Louisiana Causes of Impairment
for Threatened and Impaired Wetlands
Reporting Year 2006

Louisiana Probable Sources of Impairments
for Threatened and Impaired Wetlands
Reporting Year 2006

Louisiana Probable Sources Contributing to Impairments
for Reporting Year 2006