Document ID: EPA-HQ-OPP-2005-0061-0204
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-10-20T04:00Z

Summary of Ag Handler Exposure Monitoring in the State of Washington and
Reported Pesticide-related Illnesses in California

The trend is clearly down in terms of significantly depressed
cholinesterase enzyme levels among ag handlers with regard to the use of
azinphos methyl in the State of Washington per their 2005 report.

Only one ag handler had significantly depressed cholinesterase enzyme
levels in the State of Washington in 2005 and two in 2004 per EPA’s
document titled , “Proposed Decisions for the Remaining Uses of
Azinphos Methyl, June 9, 2006.”   In 2005, 611 workers were tested and
580 were tested in 2004.

Per the 2005 State of Washington report for all workers of pesticides,
“…the likelihood of a worker experiencing  > 20% depression in both
tests  [red blood cell and serum cholinesterase], was very low (0.8% of
total workers with a periodic test).”

“…hours of handling is not a strong predictor of the degree of ChE
depression for individuals.”   

“The greatest proportion of ChE depression exceeding the benchmark of
20% from baseline occurred primarily during dormant season spraying of
tree fruits.”  However, the azinphos methyl label forbids its
application during the dormant season.

For all pesticides, the State of Washington found numerous violations
involving the lack of an appropriate respirator cartridge or change out
of schedule and not wearing appropriate chemical resistant headgear when
required by the pesticide label.

In 2004 and 2005, “50% of employers  investigated are using a [another
named OP pesticide, not AZM] product that does not include a label
requirement for respiratory protection.”

Per a summary report by the California Department of Pesticide
Regulations, there were no illnesses reported by California physicians
associated with the use of azinphos methyl in from 1999 to 2002 and none
in 2004. There was one possible illness in 2003.