Modeling pyrethroid environmental fate in an urban setting can help us to understand better the sources, transport pathways, and mitigation strategies for reducing their environmental concentrations. Recently, a modeling approach using the Storm Water Management Model (SWMM) has been developed and validated in a high density residential watershed in southern California. The approach incorporated pyrethroid wash-off characteristics from pervious and impervious surfaces, neighborhood characteristics, and pyrethroid application practices typical of the region. To extend this modeling approach to new geographic regions, a survey was conducted to gather regionally-specific, pyrethroid-use practices. These local use practices, along with local weather and neighborhood characteristics, have enabled the geographical extension of the California modeling approach to a diverse collection of locations. Application of the SWMM modeling approach to a broader population of residential neighborhood conditions has provided aquatic exposure estimates important for developing a comprehensive higher tier ecological risk assessment for pyrethroids at the national scale.

Application of a modeling approach for predicting pyrethroid residues is urban water bodies for use in environmental risk assessments

246th National Meeting (2013)

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