Exposures of Aquatic Organisms to the Organophosphorus Insecticide, Chlorpyrifos Resulting from Use in the United States - Reviews of Environmental Contamination and Toxicology - page 83

Table 3 Frequency of detections of chlorpyrifos in surface water samples, by Farm Resource
Region (FRR) and Land-Use Class, 2002-2010

Percent detections
Agricultural Region Mixed Undeveloped Urban All classes

All FRRs 16.1 7.42 18.0 5.51 9.11

Heartland 29.8 6.83 N/A a 6.32 9.40

Northern Crescent N/A 1.59 0 0.59 1.05

Northern Great Plains N/A 2.20 5.14 N/A 3.89

Prairie Gateway N/A 2.09 18.8 9.23 7.19

Eastern Uplands N/A 0.33 0 11.3 1.22

Southern Seaboard 1.16 7.31 N/A 4.26 5.81

Fruitful Rim 11.6 37.9 8.13 10.1 21.3

Basin and Range 5.00 1.80 31.3 0 22.7

Mississippi Portal 9.01 5.93 0 19.7 8.24

Data from Martin et al. ( 2011 )
a No data available

Table 4 Ninety-fifth centiles of chlorpyrifos concentrations in surface water samples, by Farm
Resource Region (FRR) and Land-Use Class, 2002-2010

95th centiles of measured concentrations ( μ g L −1 )
Agricultural Region Mixed Undeveloped Urban All classes

All FRRs 0.0097 0.006 0.008 0.0067 0.007

Heartland 0.018 0.005 N/A a 0.0076 0.007

Northern Crescent N/A 0.005 0.005 0.005 0.005

Northern Great Plains N/A 0.005 0.005 N/A 0.005

Prairie Gateway N/A 0.005 0.009 0.008 0.0067

Eastern Uplands N/A 0.005 0.005 10.0 0.005

Southern Seaboard 0.005 0.006 N/A 0.005 0.005

Fruitful Rim 0.0086 0.022 0.005 0.0098 0.015

Basin and Range 0.005 0.005 0.01 0.005 0.009

Mississippi Portal 0.0065 0.006 0.005 0.012 0.007

Data from Martin et al. ( 2011 )
a No data available

1990 through July 2010. From 2002 to 2010, the percent detections for CPY in the
CA-SWD ranged from 7.6 to 27%, the 95th centile concentrations ranged from
0.010 to 0.1 μg L −1 , and maximum concentrations ranged from 0.15 to 3.9 μg L −1 .
Percent detections in the CA-SWD from 2002 to 2010 was in the same range as for
the Martin et al. ( 2011 ) data, while the maximum and 95th centile concentrations
were generally greater.
The majority of the applicable surface water monitoring data available in the
Washington Department of Ecology's Environmental Information Management
(WA-EIM) database (WDOE 2012 ) was generated as part of the Surface Water
Monitoring Program for Pesticides in Salmonid-Bearing Streams. The monitoring
program was specifically designed “to address pesticide presence in Endangered Species
Act (ESA)-listed, salmonid-bearing streams during typical pesticide use periods,”