Download - 52 NAWQA Study Areas
52 NAWQA Study Areas
Occurrence in Water
0 10050
StreamsShallow Ground Water
Shallow Ground Water
Shallow Ground Water
Streams
Streams
Streams
Major Aquifers
Percentage of Samples with Detections
Land use
Agricultural
Urban
Undeveloped
Mixed
Common Pesticides in Streams
AtrazineMetolachlor
Cyanazine
SimazinePrometon
TebuthiuronDiazinon
Chlorpyrifos
Carbaryl
0 10050 0 10050
UrbanAgricultural
Percentage of Samples with Detections
Organochlorines in Fish and Bed Sediment
0 10050
FishSediment
Sediment
Sediment
Fish
Fish
Fish
Sediment
Percentage of Samples with Detections
Land use
Agricultural
Urban
Undeveloped
Mixed
Common Organochlorine Compounds in Fish Tissue
0 10050 0 10050
UrbanAgricultural
Percentage of Samples with Detections
DDTChlordane
Dieldrin
Measured Atrazine in Streams
Prediction of Atrazine in Streams
Trends in Corn-Belt Herbicides
0.001
0.01
0.1
1
0.001
0.01
0.1
1
1992 1994 1996 1998 2000
CyanazineAlachlor
Acetochlor
HerbicideUse
StreamConcentrations
Frequency of Mixtures
2Number of Pesticides in Sample
4 6 8 100
50
100
Percentage ofSamples withEqual or GreaterNumber
1 3 5 7 9
75
50
25
75% have 5 or more
25% have 10or more
Potential to Affect Humans
0 10050
Streams
Ground Water
Ground Water
Ground Water
Streams
Streams
Streams
Major Aquifers
Percentage of Sites Exceeding Benchmarks
Agricultural
Urban
Undeveloped
Mixed
Potential to Affect Aquatic Life
0 10050
WaterBed Sediment
Bed Sediment
Bed Sediment
Water
Water
Water
Bed Sediment
Percentage of Sites Exceeding Benchmarks
Agricultural
Urban
Undeveloped
Mixed
Pesticides with Exceedances of Aquatic-Life Benchmarks
DiazinonChlorpyrifos
ChlorpyrifosAzinphos-Methyl
0 10050
Percentage of Sites Exceeding Benchmarks
Agriculture
Urban
0 10050
20 Pesticides with Exceedances (57% Sites)
10 Pesticides with Exceedances (83% Sites)
Trends in Urban Streams
1993
-1994
1995
-1997
1998
-2000
1993
-1994
1995
-1997
1998
-2000
1993
-1994
1995
-1997
1998
-2000
0
50
100
Sampling Period
Per
cen
tage
of
Sit
es
Chlorpyrifos Malathion Diazinon
Potential to Affect Wildlife
0 10050Percentage of Sites Exceeding Benchmarks
OrganochlorinesIn Whole
Fish
Agricultural
Urban
Undeveloped
Mixed
Declining DDT in Fish
1969
500
0
1000
1974 1979 1984 1989 1994 1999
Con
cen
trat
ion
Median DDT
Wildlife Benchmark
