Table 8.  Number of detections and range in concentration of pesticides detected in samples collected at intensive fixed sites

[mg/L, micrograms per liter]
Agriculture indicator site
Urban indicator site
Integrator site
Pesticide Num-
ber of detec-
tions
(32 samples)		 Range in concen-
tration
(µg/L)		 Pesticide Num-
ber of detec-
tions
(35 samples)		 Range in concen-
tration
(µg/L)		 Pesticide Num-
ber of detec-
tions
(26 samples)		 Range in concen-
tration
(µg/L)
Atrazine

32

 0.0060-.11 Alachlor

3

 0.0040-.018 Alachlor

4

 0.0030-.020
Benfluralin

3

  .0026-.0047 Atrazine

35

 .0040-.75 Atrazine

26

 .0080-.38
Carbaryl

4

 .0044-.090 Benfluralin

2

 .0036-.0047 Carbaryl

16

 .0051-.36
Chlorpyrifos

7

 1.0033-.0075 Bentazon

1

 .02 Carbofuran

5

 .012-.042
2,4-D

1

 .09 Bromacil

7

 .060-1.6 Chlorpyrifos

15

 .0028-.0094
DCPA

1

 1.0019 Carbaryl

21

 .0071-.33 DCPA

9

 1.0006-.016
p,p'-DDE

2

 1.0015-.0030 Chlorpyrifos

16

 1.0027-.011 Deethylatrazine

25

 .0067-.029
Deethylatrazine

32

 .0020-.11 Cyanazine

2

 .0045-.011 Diazinon

20

 .0060-.16
Diazinon

12

 1.0010-.059 2,4-D

1

 .22 Diuron

3

 .070-.24
Malathion

3

 .0040-.0080 DCPA

6

 .0006-.0031 alpha-HCH

1

 0.014
Metolachlor

6

 1.0010-.0060 p,p'-DDE

4

 .0017-.0046 Lindane

16

 .0050-.044
Prometon

20

 .0023-.0094 Deethylatrazine

34

 1.0016-.054 Malathion

7

 .0060-.036
Simazine

2

 1.0018-.0026 Diazinon

27

 .0040-.33 Metolachlor

18

 .0030-.016
Terbufos

1

 .008 Diuron

15

 .020-1.1 Prometon

26

 1.0056-.044
Trifluralin

2

 .0022-.0052 Malathion

13

 .0050-.11 Propachlor

1

 1.0009
MCPA

1

 .08 Simazine

21

 1.0025-.043
Metolachlor

16

 .0030-.018 Tebuthiuron

15

 1.0073-.43
Metribuzin

1

 0.029 Terbufos

1

 1.011
Oryzalin

1

 0.03
Prometon

35

 1.016-.24
Pronamide

1

 .014
Propanil

1

 .0078
Simazine

29

 1.0039-.25
Tebuthiuron

34

 .041-2.8
Triclopyr

2

 .070-.81

1 Values below method detection limit estimated by U.S. Geological Survey National Water-Quality Laboratory.

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