Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

5.2 μg/L for carbofuran, 0.0150 – 5.4 μg/L for methomyl, and 0.0600 – 0.1800 μg/L for 3-
hydroxycarbofuran.
Table 55. Summary of Occurrences of Carbofuran, Carbaryl, Methomyl, and 3-Hydroxycarbofuran
in CDPR Database (1991-2006)
Statistic Carbaryl Carbofuran Methomyl 3-Hydroxycarbofuran
Samples in data set 5265 5864 1982 1149
Quantifiable samples 191 347 218 3
% of quantifications in data set 3.6% 5.9% 11.0% 0.3%
LOQ range (μg/L) 0.003-1.0 0.002 0.002-1.0 0.0058-0.69
Minimum concentration (μg/L) 0.0030 0.0066 0.0150 0.0600
Maximum concentration (μg/L) 8.4 5.2 5.4 0.18
Arithmetic mean concentration (μg/L) 0.3733 0.3197 0.2984 0.1367
Standard deviation (μg/L) 0.8999 0.5521 0.5223 0.0666
Median concentration 0.1200 0.1100 0.1550 0.1700
Monitoring Data from Washington State
Data from ~30 pesticide monitoring studies conducted in the state of Washington are included in
Department of Ecology Environmental Information Management (EIM) database
(http://www.ecy.wa.gov/eim/). Data in the database are from multiple sources, including state
agencies, and may contain whole water samples as well as filtered samples. If whole water
concentrations are reported for compounds that sorb significantly to the particulate phase,
concentrations would appear higher than in a filtered sample, which represents only the dissolved
phase. The EIM requires a formal QA/QC protocol for data submitted or does a separate QA/QC
review, thus only data subject to appropriate QA/QC procedures are included. Some of the
studies contained in this database are targeted with respect to specific pesticide uses, while others
are more generalized water quality surveys. Results from a database query on carbaryl,
carbofuran, methomyl, 1-napthol, and 3-hydroxycarbofuran, conducted by NMFS, are provided
below (Table 56).
Included in the EIM database are monitoring efforts conducted jointly by the Washington
Departments of Agriculture and of Ecology in some salmon-bearing streams. Final reports for
2003-2007 seasons are publically available on their website
(http://agr.wa.gov/PestFert/natresources/SWM/default.htm). A separate summary of data from
those investigations is provided below (Table 57). Water samples are not filtered, and thus
concentrations reported include pesticides in both dissolved and particulate phases, although the
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