The Office of Pesticide Programs evaluates the potential for pesticides to occur aquatic environments using screening level fate and transport models and an assessment of available monitoring data. The interpretation of pesticide surface water monitoring data in risk assessments requires an understanding of the impact of numerous variables (<i>e.g.</i>, sample site location, sampling frequency, watershed characteristics such as pesticide use, precipitation, and soil erodibility) on the frequency and magnitude of pesticide occurrence. Major limiting factors in the use and interpretation of pesticide surface water monitoring data are infrequent sampling and the limited geographical representation that may result in under or over estimation of pesticide exposure. This presentation discusses a framework the Office of Pesticide Programs is considering for integrating available surface water monitoring data quantitatively into pesticide exposure assessments using recently developed methods which employ the SEAsonalWAVEQ with EXtended capabilities (SEAWAVE-QEX) model developed by the U.S. Geological Survey and sampling bias factors.

Spatial and temporal analysis approach to quantify pesticide concentrations in surface water

256th National Meeting (2018)

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