Cleanest/Best Watersheds

National Average

Dirtiest/Worst Watersheds

0%					50%					100%

Percentage of Surface Waters with Impaired or Threatened Uses (state + EPA data):

Number of Impaired Waterbodies (as reported by the state):

NOTE: Data limitations affect the accuracy of these rankings.

Rank watersheds by assessed use impairments
Rank counties by assessed use impairments.
Rank states by assessed use impairments, impairments due to specific causes, or impairments due to specific sources

Lake Pontchartrain contains a portion of 5 counties:

JEFFERSON Parish, LA

ORLEANS Parish, LA

ST. CHARLES Parish, LA

ST. JOHN THE BAPTIST Parish, LA

ST. TAMMANY Parish, LA

Percentage of Surface Waters with Reported Problems (state + EPA data): 100%

Number of Waterbodies with Reported Problems (as reported by the state): 2

Lake Pontchartrain

Lake Pontchartrain

Beneficial Use Most Frequently Impaired	Percent of All Impairments
Aesthetics / Scenic	100%
Aquatic Life Support	100%
Drinking Water Supply	100%
Primary Contact Recreation (Swimming)	100%
SecondaryContact Recreation (Boating)	100%
Wildlife Support	100%
Agriculture	100%
Shellfish Consumption	50%

Priority for Regulation	Number of Waterbodies
Targeted	0
High	0
Medium	0
Low	2
Not Assessed for TMDL Priority	0
Not Reported to US EPA for TMDL Priority	0

Lakes, Reservoirs, and Ponds
Number of impaired waterbodies: 2
Percent of Lakes, Reservoirs and Ponds in LOUISIANA assessed by agencies for 1997-98 reporting period: 35%

	Percent Waterbodies Affected
Low Dissolved Oxygen/Organic Enrichment	100%
Mercury	100%
Nutrients	100%
Pathogens	100%
Metals	50%

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

Lakes, Reservoirs, and Ponds
Number of impaired waterbodies: 2
Percent of Lakes, Reservoirs and Ponds in LOUISIANA assessed by agencies for 1997-98 reporting period: 35%

	Percent Waterbodies Affected
Combined Sewer Overflows	100%
Land Disposal	100%
Other Sources	100%
Unknown Sources	100%
Urban Runoff/Storm Sewers	100%

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

U.S. EPA Watershed Health Index

U.S. EPA Condition and Vulnerability Indicators

U.S. EPA Watershed Profile

U.S. Geological Survey: Water Resources Links

USGS report on the National Water-Quality Assessment (NAWQA) study unit this watershed is in.