Table
2. Summary
of detected pesticides from stations in the SANT NAWQA database,
1996-97
[--, no data available; mg/L, micrograms per liter; concentrations
in red exceed aquatic life or human health criteria]
|
| Pesticide |
Number
of
detections/
samples
|
Percentage
of
detections |
Maximum
concentration
(mg/L) |
Aquatic
criteria
(mg/L) |
Lifetime
HAL1
(mg/L) |
MCL1
(mg/L) |
Minimum
reporting
level
(mg/L) |
|
|
Herbicides
|
|
| Atrazine |
141/161
|
88
|
1.1
|
--
|
23
|
3
|
0.001
|
| Tebuthiuron |
131/161
|
81
|
0.084
|
--
|
500
|
--
|
0.010
|
| Deethylatrazine |
117/161
|
73
|
0.033
|
--
|
--
|
--
|
0.002
|
| Simazine |
113/161
|
70
|
1.6
|
310
|
4
|
4
|
0.005
|
| Metolachlor |
102/161
|
63
|
1.08
|
--
|
70
|
--
|
0.002
|
| Prometon |
95/161
|
59
|
0.055
|
--
|
2100
|
--
|
0.018
|
| Alachlor |
40/161
|
25
|
0.045
|
--
|
--
|
2
|
0.002
|
| Diuron |
12/83
|
14
|
0.12
|
31.6
|
10
|
--
|
0.020
|
| Bentazon |
9/82
|
11
|
0.66
|
--
|
200
|
--
|
0.014
|
| Fluometuron |
9/83
|
11
|
0.63
|
--
|
90
|
--
|
0.035
|
| Pronamide |
11/161
|
6.8
|
0.017
|
--
|
50
|
--
|
0.003
|
| 2,4-D |
4/82
|
4.9
|
0.82
|
--
|
70
|
70
|
0.035
|
| DCPA |
6/160
|
3.8
|
0.002
|
--
|
--
|
--
|
0.002
|
| Cyanazine |
6/161
|
3.7
|
0.058
|
--
|
41
|
--
|
0.004
|
| Pendimethalin |
5/161
|
3.1
|
0.034
|
--
|
--
|
--
|
0.004
|
| Trifluralin |
5/161
|
3.1
|
0.01
|
--
|
5
|
--
|
0.002
|
| Fenuron |
2/83
|
2.4
|
0.02
|
--
|
--
|
--
|
0.013
|
| Benfluralin |
3/161
|
1.9
|
0.006
|
--
|
--
|
--
|
0.002
|
| Butylate |
3/161
|
1.9
|
0.073
|
--
|
350
|
--
|
0.002
|
| EPTC |
2/161
|
1.2
|
0.004
|
--
|
--
|
--
|
0.002
|
| Terbacil |
2/161
|
1.2
|
0.063
|
--
|
90
|
--
|
0.007
|
| Oryzalin |
1/83
|
1.2
|
0.13
|
--
|
--
|
--
|
0.019
|
| Linuron |
1/161
|
0.6
|
0.011
|
--
|
--
|
--
|
0.002
|
| Metribuzin |
1/161
|
0.6
|
0.019
|
--
|
100
|
--
|
0.004
|
| Molinate |
1/161
|
0.6
|
0.011
|
--
|
--
|
--
|
0.004
|
|
|
Insecticides
|
|
| Chlorpyrifos |
67/161
|
42
|
0.095
|
50.041
|
20
|
--
|
0.004
|
| Diazinon |
44/161
|
27
|
.013
|
30.009
|
0.6
|
--
|
0.002
|
| Malathion |
33/161
|
20
|
0.216
|
50.1
|
200
|
--
|
0.005
|
| Carbaryl |
30/161
|
19
|
0.16
|
30.02
|
700
|
--
|
0.003
|
| Carbofuran |
6/161
|
3.7
|
0.31
|
--
|
40
|
40
|
0.003
|
| Dieldrin |
4/161
|
2.5
|
0.009
|
50.0019
|
--
|
--
|
0.001
|
| Parathion |
4/161
|
2.5
|
0.052
|
50.013
|
--
|
--
|
0.004
|
| Aldicarb
sufloxide |
1/82
|
1.2
|
1.2
|
--
|
7
|
7
|
0.021
|
| Aldicarb |
1/83
|
1.2
|
0.48
|
--
|
7
|
7
|
0.016
|
| p,p-DDE |
1/160
|
0.6
|
0.006
|
--
|
--
|
--
|
0.006
|
| Permethrin |
1/161
|
0.6
|
0.005
|
--
|
--
|
--
|
0.005
|
1HAL,
health advisory level; MCL, maximum contaminant level (U.S. Environmental
Protection Agency, 1996).
2Under review (U.S. Environmental Protection Agency, 1996).
3Freshwater chronic water-quality criteria recommendations
from National Academy of Sciences and National Academy of Engineers
(1973), modified from Nowell and Resek (1994).
4Draft (U.S. Environmental Protections Agency, 1996).
5Freshwater chronic water-quality criteria (U.S. Environmental
Protection Agency, 1997).
|
|